WO2014128808A1

WO2014128808A1 - Data sharing system

Info

Publication number: WO2014128808A1
Application number: PCT/JP2013/007112
Authority: WO
Inventors: 啓文植田; 藤田　範人
Original assignee: 日本電気株式会社
Priority date: 2013-02-22
Filing date: 2013-12-04
Publication date: 2014-08-28
Also published as: JP6164282B2; JPWO2014128808A1

Abstract

In the present invention, a communication terminal (first communication terminal) classifies a plurality of data held by the selfsame terminal into a plurality of groups, and for each group, forms a held list which is a list setting forth information of the data belonging to the group. Also, the first communication terminal transmits by means of a communication message to another communication terminal (second communication terminal) a held list selected from among the formed held lists for each group. The second communication terminal requests of the first communication terminal the data not held by the selfsame terminal among the data in the held list received from the first communication terminal. The first communication terminal transmits to the second communication terminal the requested data.

Description

Data sharing system

The present invention relates to a data sharing system, a data sharing method, a communication terminal, and a program for sharing data among a plurality of communication terminals that can communicate with each other wirelessly.

One type of method of sharing data among a plurality of communication terminals is a method of sharing data in a distributed manner among individual communication terminals without using a central management device such as a server.

For example, when communication terminals approach each other due to movement, it is proposed as a first related technique related to the present invention to use the epidemic method to exchange each other's information and synchronize the stored information ( For example, refer nonpatent literature 1). In the epidemic method, when a communication terminal in a network detects another communication terminal, it exchanges a holding list (also referred to as a summary vector) that describes information of data (content) held by itself, and the other communication terminal Understand the contents of the possession list. Based on the received possession list, the communication terminal investigates data that the self terminal does not possess and tries to acquire the data. For example, as shown in FIG. 13, the terminal T1 and the terminal T2 that have moved closer to each other exchange a holding list with each other, and the terminal T2 determines whether there is any data that the terminal T1 does not hold and the terminal T1 own list. Confirm by comparing the possession list of the terminal. In the example of FIG. 13, since the terminal T2 does not have the data B, the terminal T2 transmits a data B acquisition request to the terminal T1, and acquires the data B. By repeating this operation for all terminals in the network, the information held between the terminals is matched.

In order to solve the problem that the holding list is frequently transmitted in information sharing by the epidemic method and the bandwidth load becomes high, the second related technique related to the present invention is to suppress the transmission of overlapping information. It has been proposed (see, for example, Patent Document 1). More specifically, in a system in which data is shared between a plurality of communication terminals that are wirelessly connected to other communication terminals without using an access point, each communication terminal receives a holding list received from the other communication terminal. Whether the internal estimation unit that estimates the data currently held by the other communication terminal using the reception history matches the data currently held by the other communication terminal estimated by the internal estimation unit and the data held by the terminal itself A duplication judgment unit for judging whether or not, and an information exchanging unit for transmitting a possession list including data held by the terminal when the duplication judgment unit judges that they do not match.

In addition, in order to solve the problem that data cannot be quickly transmitted to the surroundings in the information sharing by the epidemic method, it is necessary to intentionally change the possession list notified from one communication terminal to another communication terminal. It has been proposed as a related third related technique (see, for example, Patent Document 2). More specifically, there is a second communication terminal that holds data X in an area in which wireless communication can be performed from the first communication terminal that holds data X and Y, and the wireless communication area of the first communication terminal. Assume that there is a third communication terminal that holds the data X outside and in the wireless communication area of the second communication terminal. If the first communication terminal transmits a notification message including all data X and Y held by the own terminal to the surroundings, the second communication terminal receives the notification message and the data not owned by the own terminal. After acquiring and accumulating Y, the first communication terminal determines that it has only the same data as its own terminal, and does not transmit a notification message including the data X and Y held by itself. Therefore, in the third related technology, the first communication terminal excludes the data X held in common by the own terminal and the second communication terminal, and sends a notification message including only the data Y held by the own terminal. Send to the surroundings. The second communication terminal receives this notification message, acquires and stores the data Y that the terminal itself does not hold, and then the first communication terminal does not have the data X held by the terminal itself Judgment is made and a notification message including data X and Y is transmitted to the surroundings. Since this notification message reaches not only the first communication terminal but also the third communication terminal, the third communication terminal that has received this notification message acquires data Y from the second communication terminal as a trigger. And store it on your terminal.

In addition, when data is shared by performing vehicle-to-vehicle communication between computers installed in a vehicle, it is proposed as a fourth related technique related to the present invention to select data to be shared on the transmission side (for example, (See Patent Document 3). More specifically, a computer mounted on a certain vehicle obtains and assigns individual evaluation scores to a plurality of traffic information files, document information files, and image information files according to the attributes of the respective data files. Next, one data file is selected from a plurality of data files based on the selection probability of the data file set at a rate corresponding to the evaluation score, and the selected data file is installed in another vehicle. Send to.

Further, when data is shared by communicating between communication terminals connected to a network, it has been proposed as a fifth related technique related to the present invention to select data to be shared on the receiving side (for example, a patent) Reference 4). More specifically, when new shared data is generated in a certain communication terminal, the data and its attributes are transmitted to another communication terminal. Other communication terminals refer to a sharing policy that defines the attributes of the type of data to be shared. If the received data attributes conform to the sharing policy, they are stored in the own terminal, and if not, they are discarded. .

WO2011 / 071045 gazette WO2011 / 114584 JP 2004-334624 A Japanese Patent No. 4350640

The first to third related technologies for exchanging information with each other and synchronizing the stored information are complete synchronization type data sharing in which all communication terminals have the same data, and data to be shared between the communication terminals. It is difficult to limit to a part of data.

On the other hand, in the fourth and fifth related technologies, it is possible to limit the shared data to a part of the data held by the communication terminal. However, in the fourth related technique, a communication terminal that accumulates data selects and transmits data to be transmitted to another communication terminal from the accumulated data, and the data received by the other communication terminal is used as shared data. Accumulated in own terminal. Here, there is no guarantee that the data selected by the transmission side is not held by the reception side. For this reason, there is a waste of transmitting / receiving the same data as the data already stored in other communication terminals between the communication terminals. In the fifth related technology, whether a communication terminal that stores data transmits the stored data to another communication terminal, and stores the data received by the other communication terminal according to the sharing policy as its shared data in its own terminal. Choose to discard. For this reason, there is a waste of transmitting / receiving data that is not stored in other communication terminals between the communication terminals.

The object of the present invention is that the above-mentioned problem, that is, wasteful data transmission / reception occurs between communication terminals in order to limit data to be shared between communication terminals to a part of the data held by the communication terminals. The object is to provide a data sharing system that solves the problems.

A data sharing system according to a first aspect of the present invention includes:
A data sharing system for sharing data between a plurality of communication terminals that can exchange communication messages with each other wirelessly,
Each of the above communication terminals
A data storage unit for storing one or more data;
Classifying the data stored in the data storage unit into a plurality of groups, a holding list creating unit that creates a holding list that is a list describing information of data belonging to the group for each group, and
The holding list selected from the created holding list for each group is transmitted to the other communication terminal by the communication message, and from the other communication terminal among the data in the transmitted holding list. A data providing unit that reads data requested by the communication message from the data storage unit and transmits the data to the other communication terminal by the communication message;
Of the data in the holding list received by the communication message from the other communication terminal, the data not stored in the data storage unit is requested to the other communication terminal by the communication message, and the response to the request A data acquisition unit that stores data included in the communication message received from the other communication terminal in the data storage unit.

A data sharing method according to the second aspect of the present invention includes:
A data sharing method for sharing data between a plurality of communication terminals that can exchange communication messages with each other wirelessly,
Each communication terminal classifies a plurality of data held by the communication terminal into a plurality of groups, and creates a holding list that is a list in which information of data belonging to the group is described for each group.
Each of the communication terminals transmits the holding list selected from the created holding list for each group to the other communication terminal by the communication message, and the other of the data in the transmitted holding list The data requested from the communication terminal by the communication message is transmitted to the other communication terminal by the communication message,
Each communication terminal requests other communication terminals by using the communication message data that the communication terminal does not hold among the data in the holding list received by the communication message from the other communication terminals, Data included in the communication message received from another communication terminal as a response to the request is acquired.

A communication terminal according to a third aspect of the present invention is:
A communication unit that exchanges communication messages with other communication terminals;
A data storage unit for storing one or more data;
Classifying the data stored in the data storage unit into a plurality of groups, a holding list creating unit that creates a holding list that is a list describing information of data belonging to the group for each group, and
The holding list selected from the created holding list for each group is transmitted to the other communication terminal by the communication message, and from the other communication terminal among the data in the transmitted holding list. A data providing unit that reads data requested by the communication message from the data storage unit and transmits the data to the other communication terminal by the communication message;
Of the data in the holding list received by the communication message from the other communication terminal, the data not stored in the data storage unit is requested to the other communication terminal by the communication message, and the response to the request A data acquisition unit that stores data included in the communication message received from the other communication terminal in the data storage unit.

A data sharing method according to a fourth aspect of the present invention includes:
A data sharing method executed by a communication terminal having a communication unit that exchanges communication messages with other communication terminals and a data storage unit that stores one or more data,
Classify the data stored in the data storage unit into a plurality of groups, create a holding list that is a list describing information of data belonging to the group for each group,
Sending the holding list selected from the holding list for each group created to the other communication terminal by the communication message,
The data requested by the communication message from the other communication terminal out of the transmitted data in the holding list is read from the data storage unit and transmitted to the other communication terminal by the communication message.

A data sharing method according to a fifth aspect of the present invention includes:
A data sharing method executed by a communication terminal having a communication unit that exchanges communication messages with other communication terminals and a data storage unit that stores one or more data,
A holding list describing information of data belonging to a specific group among the data held by the other communication terminal is received from the other communication terminal by the communication message,
Of the data in the received holding list, request the data not stored in the data storage unit to the other communication terminal by the communication message,
Data included in the communication message received from the other communication terminal as a response to the request is stored in the data storage unit.

A data sharing method according to a sixth aspect of the present invention includes:
Computer
A communication unit that exchanges communication messages with other communication terminals;
A data storage unit for storing one or more data;
Classifying the data stored in the data storage unit into a plurality of groups, a holding list creating unit that creates a holding list that is a list describing information of data belonging to the group for each group, and
The holding list selected from the created holding list for each group is transmitted to the other communication terminal by the communication message, and from the other communication terminal among the data in the transmitted holding list. A data providing unit that reads data requested by the communication message from the data storage unit and transmits the data to the other communication terminal by the communication message;
Of the data in the holding list received by the communication message from the other communication terminal, the data not stored in the data storage unit is requested to the other communication terminal by the communication message, and the response to the request As a data acquisition unit that stores data included in the communication message received from the other communication terminal in the data storage unit.

Since the present invention has the above-described configuration, it is possible to limit data to be shared between communication terminals to a part of the data held by the communication terminals without performing unnecessary data transmission / reception between the communication terminals. .

1 is a block diagram of a data sharing system according to a first embodiment of the present invention. It is a figure which shows an example of the sequence of the communication message exchanged between the communication terminals which comprise the data sharing system which concerns on the 1st Embodiment of this invention. It is a block diagram of the data sharing system which concerns on the 2nd Embodiment of this invention. It is a figure which shows the example of the attribute of the data in the 2nd Embodiment of this invention. It is a block diagram of the group information storage part in the 2nd Embodiment of this invention. It is a lineblock diagram of the possession list in a 2nd embodiment of the present invention. It is a block diagram of the transmission condition memory | storage part in the 2nd Embodiment of this invention. It is a flowchart which shows the process example of the list transmission part of the communication terminal in the 2nd Embodiment of this invention. It is a flowchart which shows the process example of the communication terminal in the 2nd Embodiment of this invention. It is a conceptual diagram with which the holding list for every group is created in the 2nd Embodiment of this invention. It is a conceptual diagram by which transmission of a holding list is controlled for every group in the 2nd Embodiment of this invention. It is a block diagram which shows an example of the hardware constitutions at the time of comprising the communication terminal which concerns on embodiment of this invention with electronic information processing apparatuses, such as a computer. It is a figure which shows the procedure of the data sharing by Epidemic method.

Next, embodiments of the present invention will be described in detail with reference to the drawings.
[First embodiment]
Referring to FIG. 1, a data sharing system 100 according to a first embodiment of the present invention includes a communication terminal 110 and a communication terminal 120 that can exchange communication messages with each other wirelessly.

Communication terminals

110 and 120 may both be mobile communication terminals, or one of them may be a mobile communication terminal and the other may be a fixed terminal. Although only two communication terminals are illustrated in FIG. 1, three or more communication terminals may be used.

The communication terminal 110 includes a communication unit 111, a data storage unit 112, a holding list creation unit 113, a data provision unit 114, and a data acquisition unit 115.

The communication unit 111 has a function of transmitting and receiving communication messages wirelessly with other communication terminals 120. The communication method used by the communication unit 11 is arbitrary. For example, a communication method conforming to the Wi-Fi direct specification can be used, but the present invention is not limited to this.

The data storage unit 112 stores one or more data. Individual data is arbitrary. For example, any of text data, image data, and audio data may be used, or they may be mixed. The data may be called content.

The possession list creation unit 113 has a function of creating a list (retention list) in which information of data possessed by the own communication terminal is described. The data information described in the possession list may be, for example, a summary vector or a data identifier. The list creation unit 113 classifies the data stored in the data storage unit 112 into a plurality of groups, and creates a holding list that is a list of data belonging to the group for each group. The criteria for grouping data and the number of groups are arbitrary.

The data providing unit 114 selects a holding list of a group desired to be shared with the other communication terminal 120 from the holding list for each group created by the holding list creating unit 113, and the communication communication message of the own communication terminal 110 is selected. It has a function of transmitting to other communication terminals 120 existing around. Further, when the data providing unit 114 receives a communication message requesting all or a part of the data described in the holding list from the other communication terminal 120 that has received the transmitted holding list, the requested data is received. Is read from the data storage unit 112 and transmitted to the other communication terminal 120 of the request source by a communication message.

The data acquisition unit 115 transmits a communication message requesting data not stored in the data storage unit 112 among the data described in the holding list received from the other communication terminal 120 to the other communication terminal 120. And a function of registering data included in a communication message received from another communication terminal 120 as a response to the request in the data storage unit 112.

The communication terminal 120 includes a communication unit 121, a data storage unit 122, a holding list creation unit 123, a data provision unit 124, and a data acquisition unit 125. The communication unit 121, the data storage unit 122, the possession list creation unit 123, the data provision unit 124, and the data acquisition unit 125 included in the communication terminal 120 are the communication unit 111, the data storage unit 112, and the possession list creation unit included in the communication terminal 110. 113, the data providing unit 114, and the data obtaining unit 115 have the same functions.

Next, an operation of sharing data between the

communication terminals

110 and 120 in the data sharing system of the present embodiment will be described. For convenience of explanation, it is assumed that in the initial state, the communication terminal 110 has three data, data A, data B, and data C, and the communication terminal 120 has no data.

FIG. 2 shows an example of a sequence of communication messages exchanged between the

communication terminals

110 and 120. The operation of this embodiment will be described below with reference to FIGS.

The possession list creation unit 113 of the communication terminal 110 stores the data stored in the data storage unit 112 of the communication terminal 110 at a predetermined timing, for example, at regular intervals or whenever new data is registered in the data storage unit 112. A list (holding list) in which the above information is described is created (S111 in FIG. 2). At that time, the possession list creation unit 113 classifies the data stored in the data storage unit 112 into a plurality of groups, and creates a possession list that is a list of data belonging to the group for each group. Here, the holding list creation unit 113 classifies the data into two groups, a first group including data A and data B, and a second group including data C, and creates a holding list for each group. Shall be.

Next, the data providing unit 114 of the communication terminal 110 selects a possession list of a group desired to be shared with other communication terminals 120 from the possession list for each group created by the possession list creation unit 113, and wirelessly It transmits to other surrounding communication terminals 120 by communication (S112). Here, it is assumed that the data providing unit 114 selects the possession list (A, B) of the first group from the first and second groups and transmits it to the surroundings through the communication unit 111.

When the data acquisition unit 125 of the communication terminal 120 receives the possession list (A, B) transmitted by the communication terminal 110 through the communication unit 121, the data storage unit of the communication terminal 120 and the received possession list (A, B). The data to be acquired from the communication terminal 110 is determined by comparing the list of data stored in 122 (S121). Here, all of the data not owned by the own communication terminal 120 among the data described in the possession list is determined as data to be acquired. In this example, the data to be acquired is data A and B. The data acquisition unit 125 transmits a communication message requesting acquisition of the data A and B to the communication terminal 110 through the communication unit 121 (S122).

When receiving the communication message transmitted from the communication terminal 120 through the communication unit 111, the data providing unit 114 of the communication terminal 110 reads the data A and B from the data storage unit 112 according to the request (S113) and stores them in the communication message. To the communication terminal 120 (S114).

When the data acquisition unit 125 of the communication terminal 120 receives the communication message transmitted from the communication terminal 110 through the communication unit 121, the data acquisition unit 125 stores the data A and B included in the communication message in the data storage unit 121 (S123).

Through the above operation, the data A and B held by the communication terminal 110 are accumulated in the data storage unit 122 of the communication terminal 120, and the data A and B are shared between the

communication terminals

110 and 120.

Thus, according to the present embodiment, data to be shared between communication terminals can be limited to a part of the data held by the communication terminals. The reason is that in the possession list that the communication terminal notifies other surrounding communication terminals, data belonging to the group that the communication terminal wants to share with other communication terminals among all the data possessed by the communication terminal This is because only data described in the holding list cannot be acquired even if another communication terminal that has received the holding list requests all the data described in the holding list.

Further, according to the present embodiment, the data transmitted from the communication terminal to other communication terminals among the data held by the communication terminals is data to be shared between the communication terminals. There is no waste of data that is not scheduled to be shared between the communication terminals.

[Second Embodiment]
Referring to FIG. 3, a data sharing system 200 according to the second embodiment of the present invention includes a plurality of communication terminals 210 that can communicate with each other wirelessly. The plurality of communication terminals 210 may all be mobile communication terminals, some may be mobile communication terminals, and the rest may be fixed communication terminals.

The communication terminal 210 includes a communication unit 211, a data storage unit 212, a holding list creation unit 213, a data provision unit 214, a data acquisition unit 215, a group information storage unit 216, and a transmission condition storage unit 217.

The data storage unit 212 has a function of storing one or more pieces of data 2120. Each piece of data 2120 includes a data body 2121 and attribute information 2122. The data body 2121 is text data, image data, audio data, and the like. The attribute information 2122 describes an attribute value (attribute value) that the data 2120 has.

FIG. 4 shows an example of attributes to be given to the data 2120. The data name is the name of the data 2120, the data ID is the identification number of the data 2120, the data type is the type of the data body 2121 (type of text or image), the creation date is the date when the data 2120 was created, and the update date is the data 2120 Is the date and time when the data was last updated, the expiration date is an expiration date of the data 2120, the creator is the person who created the data body 2121, and the destination group information is the attribute that represents information about the group sharing the data 2120. The attributes shown in FIG. 4 are examples, and the values of all the attributes shown in FIG. 4 may be given to the data 2120, or some of the attributes may be given, and are not shown in FIG. Other attribute values may be assigned. Further, one type of attribute value related to the same attribute may be given to the same data 2120, or a plurality of types of attribute values may be given.

The group information storage unit 216 has a function of storing the conditions of the data 2120 belonging to the group for each group. FIG. 5 is a configuration example of the group information storage unit 216. The group information storage unit 216 in this example stores an attribute that the data 21210 belonging to the group should have corresponding to the group ID for specifying the group. For example, the first line indicates that the data 2120 in which the attribute value of the distribution destination group information is “1” belongs to the group with the group ID “1”. In the example of FIG. 5, the group to which the data 2120 belongs is determined according to the value (attribute value) of a certain attribute information included in the data 2120. However, the group to which the data 2120 belongs is determined by a combination of a plurality of attribute information values. You may do it.

The possession list creation unit 213 has the same function as the possession list creation unit 113 in the first embodiment. However, in the present embodiment, a preferable internal configuration of the possession list creation unit 213 is disclosed. Referring to FIG. 3, the possession list creation unit 213 includes a data classification unit 2131, a list creation unit 2132, and a list storage unit 2133.

The data classification unit 2131 reads each data 2120 from the data storage unit 212 and compares the attribute value of the data 2120 with the attribute value that the data belonging to each group stored in the group information storage unit 216 should satisfy. , And a function of classifying the data 2120 into any of a plurality of groups.

The list creation unit 2132 has a function of creating a holding list that is a list in which information of the data 2120 classified into the group is described for each group. FIG. 6 is a configuration example of the possession list. The holding list in this example includes a header and an outline for each data. In the header, source node information (for example, a communication address and an IP address) for uniquely specifying the communication terminal 210 that has transmitted the possession list is described. In the header, a group ID is described so that it can be specified which group the possession list belongs to. Also, the summary of each data describes all or part of the attribute values of each data shown in FIG.

The transmission condition storage unit 217 has a function of storing, for each group, the transmission conditions of the group possession list. FIG. 7 is a configuration example of the transmission condition storage unit 217. The transmission condition storage unit 217 of this example stores the transmission conditions of the possession list of the group corresponding to the group ID. As an example of the transmission conditions, FIG. 7 describes the transmission interval, time zone, location, urgency, encryption, and priority. The transmission interval is a condition relating to the time interval for transmitting the possession list, and is set, for example, in minutes. The time zone is a condition regarding the time zone for transmitting the possession list. For example, a time zone during which transmission is permitted is set in one day. The location is a condition related to the location of the own communication terminal that transmits the possession list. For example, a location name or latitude / longitude that allows transmission is set. The urgency is a condition regarding whether or not to transmit the possession list when disaster information is received. Encryption is a condition relating to encryption of the possession list, and the presence or absence of encryption is set. The priority is a condition related to the priority for transmitting the possession list, and a corresponding level is set from a plurality of predetermined levels. In FIG. 7, NULL represents that the condition is not questioned, x represents that the condition is not met, and ◯ represents that the condition is met.

For example, the first line in FIG. 7 shows that the possession list of the group with the group ID 1 is in the morning from 6:00 to 9:00 on the condition that no disaster information is received regardless of the location of the communication terminal. This indicates that transmission is performed at a priority level 1 without encryption at intervals of 10 minutes in the time zone. Further, the third line in FIG. 7 shows that the possession list of the group with the group ID 3 is not encrypted at 1 minute intervals at any time zone and place when the disaster information is received. This indicates that transmission is performed at priority level 3 (highest level). Further, the fourth line in FIG. 7 shows that the possession list of the group with the group ID 4 is 3 minutes on the condition that the disaster information is not received if the communication terminal exists in and around Tokyo. This indicates that transmission is performed at priority level 2 after being encrypted at intervals.

The data providing unit 214 functionally has the same function as the data providing unit 214 in the first embodiment. However, in the present embodiment, a preferable internal configuration of the data providing unit 214 is disclosed. Referring to FIG. 3, the data providing unit 214 includes a list transmission unit 2141, a clock 2142, a position detection unit 2143, a disaster information reception unit 2144, a transmission / reception history storage unit 2145, and a response unit 2146.

The clock 2142 is a clock means for detecting the current time. The disaster information receiving unit 2144 is a receiver that receives disaster information transmitted by broadcast waves or the like.

The position detection unit 2143 is a means for detecting the location where the communication terminal 210 currently exists. For example, the position detection unit 2143 may include a GPS receiver. By having the GPS receiver, it is possible to detect the position coordinates (longitude, latitude, altitude) where the communication terminal is currently located. The GPS receiver may have a function of receiving GPS signal error correction data from a quasi-zenith satellite located in the sky and correcting a positioning error using the GPS signal error correction data. According to the GPS receiver using such a quasi-zenith satellite, since highly accurate positioning is possible, a finer area name and a narrower area can be designated as a place attribute value. This makes it possible to share data such as transmitting alert information near intersections, transmitting traffic information along lanes or along roads, and distributing coupons near shops. In addition, it is also possible to use mobile phone base station information, Wi-Fi access point information, and the like for obtaining location information. In addition, the position detection unit 2143 may have a function of acquiring an area name where the communication terminal is located from a car navigation system, for example. The position detection unit 2143 has electronic map data, and may have a function of acquiring, from the electronic map data, an area name corresponding to the position coordinates of the terminal detected by the GPS receiver.

The transmission / reception history storage unit 2145 has a function of storing the transmission / reception history of the possession list. The transmission / reception history storage unit 2145 receives the possession list transmitted from the list transmission unit 2141 to another communication terminal, and uses a pair of the transmission time of the possession list and the group ID described in the header as one transmission history. Remember. Also, the transmission / reception history storage unit 2145 receives a holding list received from another communication terminal from the communication unit 211, and stores a pair of the reception time of the holding list and the group ID described in the header as one reception history. .

The list transmission unit 2141 inputs the transmission conditions of each group from the transmission condition storage unit 217, inputs the current time from the clock 2142, inputs the position of the own communication terminal 210 from the position detection unit 2143, and the disaster information reception unit 2144. From the plurality of possession lists stored in the list storage unit 2133 of the possession list creation unit 213, the presence / absence of reception of disaster information is input from the transmission / reception history storage unit 2145, and the transmission / reception history of the latest possession list is input. It has a function of detecting a possession list in which a transmission condition is satisfied and transmitting it to another communication terminal through the communication unit 211.

FIG. 8 is a flowchart showing an example of processing of the list transmission unit 2141. Hereinafter, the details of the list transmission unit 2141 will be described with reference to FIG.

When the process shown in FIG. 8 is started, the list transmission unit 2141 first stores the group IDs in the headers of all possession lists stored in the list storage unit 2133 in the candidate list that is an internal variable (step S211). .

Next, the transmission interval, time zone, location, and urgency in the holding list transmission condition of each group stored in the transmission condition storage unit 217, the clock 2142, the position detection unit 2143, the disaster information reception unit 2144, the transmission / reception history The group ID that does not satisfy the transmission condition is removed from the candidate list by checking the input from the storage unit 2145 (step S212).

For example, referring to FIG. 7, since the transmission interval of the group with group ID 1 is 10 minutes, the latest transmission history is referred to by referring to the latest transmission history of the holding list with group ID = 1 from the transmission / reception history storage unit 2145. If the transmission time described in is within 10 minutes from the present time, the group ID = 1 does not satisfy the transmission condition and is removed from the candidate list.

Also, referring to FIG. 7, since the time zone of the group with group ID 2 is from 17:00 to 20:00, if the current time is outside that time zone, the group ID = 2 satisfies the transmission condition. Remove it from the candidate list.

In addition, referring to FIG. 7, since the urgency of the group with the group ID 3 is “◯”, the group ID = 3 does not satisfy the transmission condition unless the disaster information receiving unit 2144 receives the disaster information. So remove it from the candidate list.

Also, referring to FIG. 7, since the location of the group with the group ID 4 is Tokyo, if the position detected by the position detection unit 2143 is other than Tokyo and its vicinity, the group ID = 4 is transmitted. Since the condition is not met, it is removed from the candidate list.

Next, the list transmission unit 2141 determines whether or not the candidate list is empty (step S213), and if it is empty, the process proceeds to step S218. If not empty, the list transmission unit 2141 determines one group ID as a transmission candidate from the group IDs remaining in the candidate list (step S214). When a unique group ID is described in the candidate list, this unique group ID is set as a transmission candidate. When two or more group IDs are described in the candidate list, if there is a unique group ID with a higher priority level set in the possession list transmission condition, it is set as a transmission candidate, Other than the above, one transmission candidate is determined by an arbitrary method from a plurality of group IDs having the highest priority level.

Next, the list transmission unit 2141 acquires from the transmission / reception history storage unit 2145 the latest time when the possession list of the group ID having a higher priority than the transmission candidate group ID determined in step S214 is transmitted / received (step S215). Then, a time difference from the acquired time to the current time is calculated, and it is determined whether this time difference exceeds a predetermined threshold value (S216). The above threshold is from the time when the possession list is transmitted to the time when data sharing is expected to be completed by exchanging communication messages between the communication terminal that received the possession list and the communication terminal that is the possession list transmission source. It is desirable that the time is set to be the same as or slightly longer than the time. Next, if at least one of the acquired times does not exceed the threshold, the list transmission unit 2141 transmits the possession list of the transmission candidate group determined in step S214. Abandon and proceed to step S218. If none of the acquired times does not exceed the threshold, the possession list of the transmission candidate groups determined in step S214 is read from the list storage unit 2133, and through the communication unit 211. It transmits to another communication terminal (step S217). At this time, if encryption is specified in the transmission condition of the group, the holding list is encrypted and transmitted. Then, the process proceeds to step S218.

The list transmission unit 2141 waits for a predetermined time in step S218, and then returns to the process of step S211 to repeat the above-described process again. It is desirable that the waiting time in step S218 is sufficiently shorter than the transmission interval of the holding list.

Referring to FIG. 3 again, the response unit 2146 of the data providing unit 214 receives a communication message related to a data request from another communication terminal that has received the possession list transmitted by the list transmission unit 2141 through the communication unit 211, and sends a request. The read data is read from the data storage unit 212 and transmitted to another requesting communication terminal by a communication message.

The data acquisition unit 215 receives the possession list received from the other communication terminal 210 from the communication unit 211, determines data that is not stored in the data storage unit 112 among the data described in the possession list, and determines this It has a function of transmitting a communication message requesting data to the communication terminal 210 that is the transmission source of the holding list through the communication unit 211. A method of determining data that is not stored in the data storage unit 112 among the data described in the possession list is arbitrary. For example, for each data summary described in the possession list, it is checked whether or not data 2120 having attribute information 2122 having the same contents as the summary is stored in the data storage unit 212, and the data described in the possession list Among these, the data that does not match the attribute information 2122 of any data in the data storage unit 212 may be determined as acquisition target data. Or, referring to the holding list having the same group ID as the group ID described in the header of the holding list from the list storage unit 2133, an overview of each data of the received holding list and an overview of each data of the above-mentioned holding list, Of the received data in the holding list may be determined as acquisition target data that does not match any data in the referenced holding list.

FIG. 9 is a flowchart showing an example of processing of the communication terminal 210. The operation of this embodiment will be described below with reference to FIG.

In the communication terminal 210, first, the possession list creation unit 213 creates a possession list for each group (step S221). More specifically, the data classification unit 2131 reads each data 2120 from the data storage unit 212, and the attribute value that the data 2120 has and the attribute value that the data belonging to each group stored in the group information storage unit 216 should satisfy And the data 2120 is classified into any of a plurality of groups. Next, the list creation unit 2132 creates, for each group, a holding list that is a list of data 2120 classified into the group, and records it in the list storage unit 2133. FIG. 10 is a conceptual diagram in which a holding list for each group is created. In this example, the contents A to I possessed by the communication terminal are classified into three groups A to C.

Next, in the communication terminal 210, the list transmission unit 2141 of the data providing unit 214 determines whether or not there is a possession list of a group that satisfies the transmission condition by the procedure described with reference to FIG. The holding list of the satisfying group is transmitted to other communication terminals (steps S222 and S223). At this time, the list transmission unit 2141 refers to the encryption condition in the transmission conditions, and if the encryption is valid, the list transmission unit 2141 encrypts and transmits the possession list. After the possession list is transmitted, when the response unit 214 receives a data request from the other communication terminal 210, the requested data is read from the data storage unit 212 and transmitted to the other communication terminal 210 that is the request source (step). S224, S225).

In communication terminal 210, data acquisition unit 215 determines whether or not a possession list of a certain group has been received from other communication terminals 210, and if received, data to be acquired in the data of the possession list. It is confirmed whether there is any (steps S226 and S227). If the received possession list is encrypted, decryption is performed using a predetermined decryption method. If there is data to be acquired, the data acquisition unit 215 requests the data from the other communication terminal 210 that is the transmission source of the holding list, receives the data returned as a response, and stores the data in the data storage unit 212. Store (steps S228 and S229).

In the communication terminal 210, when new data is stored in the data storage unit 212, the holding list creation unit 213 re-creates the holding list (step S230). In the re-creation of the holding list, only the holding list of the group to which the newly added data belongs may be re-created.

As described above, according to this embodiment, the same effects as those of the first embodiment can be obtained, and the following effects can be obtained.

It is possible to create a possession list for each group obtained by grouping a plurality of data shared between communication terminals according to the attribute values of the data, and transmit it to other communication terminals in the vicinity. The reason is that the possession list creation unit 213 compares the data belonging to each group stored in the group information storage unit 216 with the attribute information of the data stored in the data storage unit 212 to make the data into groups. This is because classification is performed and a holding list is created in units of groups, and the list transmission unit 2141 transmits the holding list in units of groups.

In addition, as shown in FIG. 11, for each group obtained by grouping a plurality of data shared between communication terminals according to the attribute values thereof, the transmission interval, time zone, and location of the holding list are controlled. Can do. The reason is that the list transmission unit 2141 controls transmission of the possession list of each group based on the possession list transmission condition including the transmission interval, time zone, and location for each group. Thereby, transmission of the possession list can be controlled according to the data attribute.

Also, it is possible to control whether or not the possession list is encrypted and transmitted for each group obtained by grouping a plurality of data shared between communication terminals. The reason is that the list transmission unit 2141 controls whether or not to transmit the encrypted list of each group based on the encryption condition for each group. This makes it possible to share data only between communication terminals of specific users who know the decoding method.

Also, propagation of data belonging to a high priority group between communication terminals can be promoted. The reason is that transmission of the holding list of the lower priority group is suppressed until a certain period of time has elapsed since the holding list of the high priority group was transmitted or received, so the priority is high. This is because the communication exchanged for data sharing between the holding list transmission source and the receiving communication terminal performed after the transmission of the group holding list is not hindered by the transmission of the group holding list with a low priority.

[Third embodiment]

FIG. 12 shows an example of a hardware configuration when the communication terminal 910 constituting the data sharing system of the present invention is configured by an electronic information processing apparatus such as a computer. The communication terminal 910 includes a CPU (Central Processing Unit) peripheral part, an input / output part, and a legacy input / output part. The CPU peripheral section includes a CPU 902, a RAM (Random Access Memory) 903, a graphic controller 904, and a display device 905 that are connected to each other by a host controller 901. The input / output unit includes a communication interface 907, a hard disk drive 908, and a CD-ROM (Compact Disk Read Only Memory) drive 909 connected to the host controller 901 by the input / output controller 906. The legacy input / output unit includes a ROM (Read Only Memory) 910, a flexible disk drive 911, and an input / output chip 912 connected to the input / output controller 906.

The host controller 901 connects the RAM 903, the CPU 902 that accesses the RAM 903 at a high transfer rate, and the graphic controller 904. The CPU 902 operates based on programs stored in the ROM 910 and the RAM 903 to control each unit. The graphic controller 904 acquires image data generated by the CPU 902 or the like on a frame buffer provided in the RAM 903 and displays the image data on the display device 905. Instead of this, the graphic controller 904 may include a frame buffer for storing image data generated by the CPU 902 or the like.

The input / output controller 906 connects the host controller 901 to the hard disk drive 908, the communication interface 907, and the CD-ROM drive 909, which are relatively high-speed input / output devices. The hard disk drive 908 stores programs and data used by the CPU 902. The communication interface 907 is connected to another communication terminal 320 to transmit / receive a program or data. The CD-ROM drive 909 reads a program or data from the CD-ROM 992 and provides it to the hard disk drive 908 and the communication interface 907 via the RAM 903.

The input / output controller 906 is connected to a ROM 910, a flexible disk drive 911, and a relatively low-speed input / output device such as an input / output chip 912. The ROM 910 stores a boot program executed when the communication terminal 310 is started, a program depending on the hardware of the communication terminal 310, and the like. The flexible disk drive 911 reads a program or data from the flexible disk 993 and provides it to the hard disk drive 908 and the communication interface 907 via the RAM 903. The input / output chip 912 connects various input / output devices via the flexible disk drive 911 or a parallel port, a serial port, a keyboard port, a mouse port, and the like.

The program executed by the CPU 902 is stored in a recording medium such as the flexible disk 993, the CD-ROM 992, or an IC (Integrated Circuit) card and provided by the user. The program stored in the recording medium may be compressed or uncompressed. The program is installed in the hard disk drive 908 from the recording medium, read into the RAM 903, and executed by the CPU 902. The program executed by the CPU 902 includes the communication terminal 310, the data storage unit 211, the holding list creation unit 213, the data provision unit 214, the data acquisition unit 215, and the group information storage unit 216 described with reference to FIGS. And function as the transmission condition storage unit 217.

The programs shown above may be stored in an external storage medium. As storage media, in addition to the flexible disk 993 and CD-ROM 992, optical recording media such as DVD (Digital Versatile Disk) or PD (Phase Disk), magneto-optical recording media such as MD (MiniDisk), tape media, IC cards A semiconductor memory or the like can be used. In addition, an information sharing system may be provided as a program via a network by using a storage medium such as a hard disk or a RAM provided in a server system connected to a dedicated communication network or the Internet as a recording medium.

Although the present invention has been described with reference to the above embodiments, the present invention is not limited to the above-described 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.

The present invention enjoys the benefit of the priority claim based on the patent application of Japanese Patent Application No. 2013-032833 filed on February 22, 2013 in Japan, and is described in the patent application. The contents are all included in this specification.

The present invention can be applied to a data sharing system for sharing data such as various contents in an ad hoc network between communication terminals mounted on a vehicle such as an automobile or between portable communication terminals.

110, 120 ...

communication terminals

111, 121 ...

communication unit

112, 122 ...

data storage unit

113, 123 ... holding

list creation unit

114, 124 ...

data providing unit

115, 125 ... data acquisition unit

Claims

A data sharing system for sharing data between a plurality of communication terminals that can exchange communication messages with each other wirelessly,
Each communication terminal is
A data storage unit for storing one or more data;
Classifying the data stored in the data storage unit into a plurality of groups, a holding list creating unit that creates a holding list that is a list describing information of data belonging to the group for each group;
The holding list selected from the created holding list for each group is transmitted to the other communication terminal by the communication message, and from the other communication terminal among the data in the transmitted holding list. A data providing unit that reads data requested by the communication message from the data storage unit and transmits the data to another communication terminal by the communication message;
Requesting other communication terminals for data not stored in the data storage unit among the data in the holding list received by the communication message from the other communication terminals, and responding to the request A data sharing system comprising: a data acquisition unit that stores data included in the communication message received from the other communication terminal in the data storage unit.
The data stored in the data storage unit is composed of a data body and attribute information,
A group information storage unit for storing the attribute information to be satisfied by the data belonging to the group for each group;
In the classification of the data into the plurality of groups, the holding list creation unit compares the attribute information included in the data with the attribute information that the data belonging to the group should satisfy, The data sharing system according to claim 1, wherein the data sharing system is classified into groups.
A transmission condition storage unit that stores transmission conditions of the holding list of the group for each group,
The data sharing system according to claim 1 or 2, wherein, in the transmission of the holding list, the data providing unit transmits the holding list of the group according to the transmission condition of the holding list of the group.
The transmission condition of the possession list of the group includes a condition regarding an interval for transmitting the possession list, a condition regarding a time zone for transmitting the possession list, a condition regarding a location of a local communication terminal that transmits the possession list, and the possession list. The data sharing system according to claim 3, further comprising: at least one of a condition relating to encryption of the data and a condition relating to whether the possession list is transmitted when disaster information is received.
The transmission condition of the possession list of the group has a condition regarding a priority for transmitting the possession list,
In the transmission of the holding list, the data providing unit is configured to transmit the holding list until the fixed period elapses from the time when the holding list is transmitted from the own communication terminal or another communication terminal. The data sharing system according to claim 3, wherein the possession list having the lower priority than the priority is not transmitted from the own communication terminal.
A data sharing method for sharing data between a plurality of communication terminals that can exchange communication messages with each other wirelessly,
Each of the communication terminals classifies a plurality of data held by the own communication terminal into a plurality of groups, and creates a holding list that is a list in which information of data belonging to the group is described for each group,
Each of the communication terminals transmits the holding list selected from the created holding list for each group to the other communication terminal by the communication message, and the other of the data in the transmitted holding list Transmitting the data requested by the communication message from the communication terminal to the other communication terminal by the communication message;
Each of the communication terminals requests other communication terminals by using the communication message for data not held by the own communication terminal among the data in the holding list received by the communication message from the other communication terminal, A data sharing method for acquiring data included in the communication message received from another communication terminal as a response to the request.
A communication unit that exchanges communication messages with other communication terminals;
A data storage unit for storing one or more data;
Classifying the data stored in the data storage unit into a plurality of groups, a holding list creating unit that creates a holding list that is a list describing information of data belonging to the group for each group;
The holding list selected from the created holding list for each group is transmitted to the other communication terminal by the communication message, and from the other communication terminal among the data in the transmitted holding list. A data providing unit that reads data requested by the communication message from the data storage unit and transmits the data to another communication terminal by the communication message;
Requesting other communication terminals for data not stored in the data storage unit among the data in the holding list received by the communication message from the other communication terminals, and responding to the request A data acquisition unit that stores data included in the communication message received from the other communication terminal as a data storage unit.
The data stored in the data storage unit is composed of a data body and attribute information,
A group information storage unit for storing the attribute information to be satisfied by the data belonging to the group for each group;
In the classification of the data into the plurality of groups, the holding list creation unit compares the attribute information included in the data with the attribute information that the data belonging to the group should satisfy, The communication terminal according to claim 7, which is classified into a group.
A transmission condition storage unit that stores transmission conditions of the holding list of the group for each group,
The communication terminal according to claim 7 or 8, wherein, in the transmission of the possession list, the data providing unit transmits the possession list of the group according to the transmission condition of the possession list of the group.
The transmission condition of the possession list of the group includes a condition regarding an interval for transmitting the possession list, a condition regarding a time zone for transmitting the possession list, a condition regarding a location of a local communication terminal that transmits the possession list, and the possession list. The communication terminal according to claim 9, wherein the communication terminal has at least one of a condition regarding encryption and a condition regarding whether to transmit the possession list when disaster information is received.
The transmission condition of the possession list of the group has a condition regarding a priority for transmitting the possession list,
In the transmission of the holding list, the data providing unit is configured to transmit the holding list until the fixed period elapses from the time when the holding list is transmitted from the own communication terminal or another communication terminal. The communication terminal according to claim 9, wherein the possession list having the lower priority than the priority is not transmitted from the own communication terminal.
A data sharing method executed by a communication terminal having a communication unit that exchanges communication messages with other communication terminals and a data storage unit that stores one or more data,
Classifying the data stored in the data storage unit into a plurality of groups, creating a holding list that is a list describing information of data belonging to the group for each group,
Transmitting the holding list selected from the holding list for each of the created groups to the other communication terminal by the communication message;
A data sharing method of reading data requested by the communication message from another communication terminal out of the transmitted data in the holding list from the data storage unit and transmitting the data to the other communication terminal by the communication message.
A data sharing method executed by a communication terminal having a communication unit that exchanges communication messages with other communication terminals and a data storage unit that stores one or more data,
A holding list that describes information of data belonging to a specific group of data held by the other communication terminal is received from the other communication terminal by the communication message,
Requesting the other communication terminal by the communication message data that is not stored in the data storage unit among the received data in the holding list,
A data sharing method for storing, in the data storage unit, data included in the communication message received from the other communication terminal as a response to the request.
Computer
A communication unit that exchanges communication messages with other communication terminals;
A data storage unit for storing one or more data;
Classifying the data stored in the data storage unit into a plurality of groups, a holding list creating unit that creates a holding list that is a list describing information of data belonging to the group for each group;
The holding list selected from the created holding list for each group is transmitted to the other communication terminal by the communication message, and from the other communication terminal among the data in the transmitted holding list. A data providing unit that reads data requested by the communication message from the data storage unit and transmits the data to another communication terminal by the communication message;
Requesting other communication terminals for data not stored in the data storage unit among the data in the holding list received by the communication message from the other communication terminals, and responding to the request As a program for functioning as a data acquisition unit for storing data included in the communication message received from another communication terminal in the data storage unit.