JP2006025210A - Terminal device, communication method and computer program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a terminal device which enables an information sender to send information only to another user's terminal existing in a specific region specified by the information sender. <P>SOLUTION: The terminal device 10 is provided with an information management DB 22 which stores an ID specifiable uniquely and imparted to information in advance and a potential value showing whether preset information is transferred in association with each other, and stores. A communication control part 24 receives from another terminal device, information, and an ID and potential value both corresponding to the information, and an information management part 23 registers the information, the ID, and the potential value into the information management DB 22. Then, the information management part 23 reads the potential value corresponding to the information from the information management device DB 22 and, when the potential value exceeds the predetermined threshold, the information, the ID corresponding to the information, and a value obtained by subtracting a first subtraction value from the read potential value are transferred to the other terminal device connected by radio. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a terminal device and a communication method capable of restricting a distribution range for information having value only within a limited distance, such as neighboring information, in a terminal device that transmits and receives information mainly by wireless communication, and It relates to a computer program.

Information provision, communication services, and distribution services using conventional networks, such as electronic bulletin board systems and corporate information provision services, are terminal devices connected to the network. It is possible to send and receive information freely regardless. However, depending on the type of information, it may be valuable as information only in a specific area, such as a restaurant menu, and may not be valuable in other areas.
When it is desired to obtain information on such a specific place, in a form in which the user operates a terminal device to obtain information on a website or the like, that is, in the Pull-type distribution, the user starts from a link on which a map or area name is described. It can be obtained by selecting the link you want to see. Further, in a form in which a company or the like distributes information to a user, that is, push-type distribution, the user inputs information such as a location in advance and specifies position information or uses a device such as a GPS (Global Positioning System). The current location information of the user's terminal device is obtained, and the information is distributed to the user's terminal device according to the location information (see Patent Documents 1 to 5).
Japanese Patent No. 3222142 JP 2001-306922 A JP 2002-290356 A JP 2002-015215 A JP 2003-348629 A

However, if the information sender wants to distribute information only to the terminal device of the user who exists in a specific area, or the user operates the terminal device and refers only to the information in the vicinity of the location where the user exists For example, the following problems exist in the conventional technique. First, in the pull-type distribution, there is a problem that the user has to select a region and takes time and effort for the user. Further, in the pull-type distribution, the user can select a region regardless of his / her actual position, and there is a problem that the recipient cannot be restricted from the distribution side.
In push-type distribution, the distributor has to fully trust the location information registered by the user, and when the user moves frequently, the registration must be changed every time the user moves. There is a problem with difficulty. As a method for solving the above problem, a method using GPS has been proposed, but there is a problem that another device called GPS is required.

  The present invention has been made to solve the above problem, and its purpose is not to require a special device such as a GPS, but to a terminal of another user existing in a distribution range designated by a user who is an information sender. The object is to provide a terminal device for transferring information limited to the device.

  In order to solve the above-described problem, the present invention wirelessly connects to the other terminal device (terminal device 10) when it exists within a predetermined distance from the other terminal device, and communicates information with the other terminal device. In the terminal device that performs transmission / reception, an information storage unit (information management database 22) that associates and stores uniquely-identifiable identification information given in advance to the information and a preset transferable value indicating whether the information can be transferred. ), The information, the identification information corresponding to the information, and the transferable value are received from the other terminal device, and the information, the identification information, and the transferable value are registered in the information storage unit. After being registered by the information registration unit (information management unit 23) and the reception information registration unit, the transferable value corresponding to the information is read from the information storage unit, and the transferable value is a predetermined threshold value When exceeding, the transfer that transfers the information, the identification information corresponding to the information, and a value obtained by subtracting a predetermined first subtraction value from the read transferable value to the other terminal device wirelessly connected Means (information management unit 23 and communication control unit 24).

  The present invention is the above invention, wherein the transferable value corresponding to the information stored in the information storage unit is read at a predetermined time interval, and a predetermined second subtraction value is subtracted from the transferable value. A first update unit (information management unit) that updates the information storage unit with a value as the transferable value, and the transferable value is updated by the first update unit, and the information corresponding to the information A deletion unit (information management unit) that reads a transferable value from the information storage unit and deletes the information from the information storage unit when the transferable value is equal to or less than a predetermined threshold; It is characterized by.

  According to the present invention, in the above invention, when new information is registered in response to a user instruction, the identification information is added to the information, and a predetermined initial value is set as the transferable value of the information. New information registration means (user interface unit 20 and information management unit 23) for registering in the information storage unit.

  According to the present invention, in the above invention, when the received identification information is present in the information storage unit, the reception information registration unit is configured to transfer the transferable value corresponding to the identification information present in the information storage unit. A larger value of the received transferable values is registered in the information storage unit as the transferable value.

  According to the present invention, in the above invention, the reception information registering unit receives additional information for the information and the identification information of the information to which the additional information is added from the other terminal device; When the identification information received by the additional information receiving means is present in the information storage unit, a predetermined addition value is added to the transferable value corresponding to the identification information, and the transfer is possible after the addition When the value does not exceed a predetermined upper limit value, the information storage unit is updated with the transferable value after addition as the transferable value, and when the value exceeds the predetermined upper limit value, the predetermined upper limit value is And a second updating unit that updates the information storage unit as a transferable value.

  The present invention includes an information storage unit that stores uniquely-identifiable identification information previously assigned to information and a preset transferable value indicating whether or not the information can be transferred. In a communication method of a terminal device that wirelessly connects to the other terminal device and transmits / receives the information to / from the other terminal device, the information from the other terminal device corresponds to the information and the information. Receiving the identification information and the transferable value, registering the received information, the identification information and the transferable value in the information storage unit, and the transferable value corresponding to the information. A process of reading from the information storage unit, and when the read transferable value exceeds a predetermined threshold value, a predetermined first subtraction from the information, the identification information corresponding to the information, and the read transferable value A step of transferring a value obtained by subtracting the radio connection to which the other terminal device, a communication method characterized by comprising the.

  The present invention includes an information storage unit that stores uniquely-identifiable identification information previously assigned to information and a preset transferable value indicating whether or not the information can be transferred. A terminal device computer that wirelessly connects to the other terminal device and transmits / receives the information to / from the other terminal device, and corresponds to the information and the information from the other terminal device. Received information registration means for receiving the identification information and the transferable value and registering the information, the identification information and the transferable value in the information storage unit, and storing the transferable value corresponding to the information in the information storage And when the transferable value exceeds a predetermined threshold, the information, the identification information corresponding to the information, and a value obtained by subtracting a predetermined first subtraction value from the read transferable value are wirelessly transmitted. Contact A computer program for causing the transfer means functions as, for transferring to the other terminal devices that are.

  According to the present invention, the terminal device includes the information storage unit that stores the identification information that is uniquely specified in advance that can be uniquely specified and the transferable value that indicates whether transfer of the preset information is possible or not. . And when it exists in the predetermined distance from another terminal device, it carries out wireless connection with the other terminal device. Information, identification information corresponding to the information, and a transferable value are received from another terminal device, and the received information, identification information, and transferable value are registered in the information storage unit. Next, a transferable value corresponding to the information is read from the information storage unit, and when the transferable value exceeds a predetermined threshold value, a predetermined first value is obtained from the information, the identification information corresponding to the information, and the read transferable value. The value obtained by subtracting the subtraction value is transferred to another terminal device that is wirelessly connected. For this reason, since transferability is determined based on the transferable value, the number of transfers can be limited when the terminal device transfers to another terminal device. As a result, it is possible to limit the information distribution range according to a predetermined distance at which the terminal devices can communicate with each other and the number of transferable times.

  According to the present invention, the terminal device reads a transferable value corresponding to information stored in the information storage unit at a predetermined time interval, and subtracts a predetermined second subtraction value from the transferable value. Is updated as a transferable value. Then, after the transferable value is updated, the transferable value corresponding to the information is read from the information storage unit, and when the transferable value is equal to or less than a predetermined threshold, the information is deleted from the information storage unit. Yes. Therefore, old information is automatically deleted as time passes, and is no longer distributed to other terminal devices. As a result, even when the user moves with the terminal device, the transferable value decreases with the passage of time, so that the information distribution range can be indirectly limited in terms of distance.

  Further, according to the present invention, when registering new information in response to a user instruction, the terminal device assigns identification information to the new information and sets a predetermined initial value as a transferable value. The information is registered in the information storage unit. Therefore, the information sender can set a transferable value corresponding to the distribution range intended by the information sender, and can adjust the distribution range for each piece of information by the transferable value.

  Further, according to the present invention, when the identification information of the received information is present in the information storage unit, the terminal device includes the transferable value corresponding to the identification information existing in the information storage unit and the received transferable value. The larger value is registered in the information storage unit as a transferable value. Therefore, even if information is received redundantly from a plurality of terminal devices, it can be adjusted to a transferable value when received with the minimum number of transfers. As a result, it becomes possible to transfer information within the distribution range intended by the information sender who sets the transferable value.

  According to the present invention, the terminal device receives additional information for information and identification information of information to which the additional information is added from another terminal device. When the received identification information exists in the information storage unit, a predetermined addition value is added to the transferable value corresponding to the identification information, and the transferable value after addition does not exceed the predetermined upper limit value The information storage unit is updated with the transferable value after addition as the transferable value. Further, when the transferable value after addition exceeds a predetermined upper limit value, the information storage unit is updated with the predetermined upper limit value as the transferable value. Therefore, when information is added, the distribution range can be expanded as new information. On the other hand, when the transfer is frequently performed in a short time and the transferable value increases, it is possible to prevent the distribution range from being extended without restriction because the restriction is imposed by a predetermined upper limit value.

Hereinafter, a terminal device and a wireless communication system according to an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic block diagram showing a wireless communication system 1 according to the present embodiment.
As shown in the figure, the wireless communication system 1 is composed of a plurality of terminal devices 10-1, 10-2, 10-3, 10-4, and 10-5 having a wireless communication function (hereinafter, referred to as “the wireless communication system 1”). In the case where the entire terminal device is shown instead of individual terminal devices, 10 is used as a representative code and is described as the terminal device 10). The terminal device 10 corresponds to, for example, a PDA (Personal Digital Assistant) capable of wireless communication, and directly communicates with other terminal devices within the reach of wireless radio waves. The radio wave ranges 15-1, 15-2, 15-3, 15-4, and 15-5 are ranges where the radio waves of the respective terminal devices 10 reach, and communicate with each other when entering the radio wave range. It becomes possible. As described above, the wireless communication system 1 that directly communicates with each other between the terminal devices 10 within the reach of wireless radio waves is called an ad hoc communication system.

  FIG. 2 is a block diagram showing an internal configuration of the terminal device 10. In the figure, a user interface unit 20 receives a user input from an input device such as a keyboard or a mouse, and displays an internal processing result on a display device such as a display. The application unit 21 is an application for transmitting / receiving information to / from another terminal device 10, for example, an application such as a peer-to-peer communication method that does not require a server device. The application unit 21 receives user information input via the user interface unit 20, writes the information to a bulletin board that can share information with other terminal devices in a peer-to-peer communication method, and requests from other terminal devices 10. Performs basic processing for information acquisition and distribution, such as information retrieval. The information management unit 23 manages data such as contents of information transmitted / received to / from other terminal apparatuses 10 and ID (Identification) given to the information and a potential value described later. The information management database (hereinafter referred to as DB) 22 stores the IDs and potential values described above that are processed by the information management unit 23. The communication control unit 24 detects that another terminal device 10 has entered the radio wave range 15 and connects to the communication control unit 24 of the other terminal device 10 to transmit and receive information.

FIG. 3 is a diagram illustrating a data configuration of the information management DB 22.
In the figure, a value uniquely identifiable in the wireless communication system 1 assigned to each information is set in the ID. For example, the ID is a value generated from a GUID (Global Unique IDentifier) or the like. When the ID is generated by a GUID, a 128-bit value is assigned to the ID. The potential value is a value serving as an index of whether or not the information can be transferred, and is set when the user of the terminal device 10 who is an information sender generates information. In the file name, the name of the file storing the information is set. The information source ID (= parent ID) is information to be added (parent information) so that the terminal device 10 can identify which information is added when new information is added to the information. ID is set.

  FIG. 4 is a diagram illustrating a communication format of information transmitted / received between the terminal devices 10. In the same figure, FIG. (A) is a format when information is newly set on the bulletin board, and the first data is 0, indicating that the information is newly added. Next, the information ID and potential value are set, and then the information body is set. FIG. 5B shows a format used when information is added to the bulletin board. The first data is 1, indicating that the information is added. Next, an ID and a potential value are set, and thereafter, an information ID (parent ID in the figure) of the added original information is set, and a main body of the added information is set.

With reference to FIG. 5 to FIG. 10, processing for operating the potential value inside the terminal device 10 to limit the information distribution range will be described.
FIG. 5 is a flowchart illustrating a process when new information is generated in the terminal device 10.
First, the user interface unit 20 receives a user operation and generates new information (hereinafter referred to as information a) (step S5-1). Next, the information management unit 23 generates and assigns an ID that can be uniquely identified for the information a (hereinafter referred to as IDa), sets an initial value for the potential value (hereinafter referred to as Pa), and sets the information a and IDa. And Pa are registered in the information management DB 22 (step S5-2). Next, it is determined whether or not the value of Pa is equal to or less than a preset threshold value (step S5-3). If it is less than or equal to the threshold value, the process ends. If the threshold value is exceeded, it is determined whether or not there is a terminal device 10 to be a communication partner (step S5-4). If there is no terminal device 10 to be a communication partner, the process ends. When there is a terminal device 10 that is a communication partner, the information a, IDa, and a potential value (Pa ′) obtained by subtracting a certain value are transferred to the terminal device 10 via the communication control unit 24 (step S5). -5).
In addition, as a constant value subtracted from the potential value, there are a method of reducing a value of 10% of the original potential value and a method of reducing a specific value from the original value, and each terminal device 10 is uniformly applied by the same method. Must be set to

FIG. 6 is a flowchart illustrating a process when the terminal device 10 receives new information.
First, the communication control unit 24 receives new information (hereinafter, information a) (step S6-1). Next, the information management unit 23 detects the same ID as the ID a of the information a received from the information management DB 22 (step S6-2). As a result of detection (step S6-3), if the same ID cannot be detected, information a is registered as new information in the information management Db22 (step S6-4), and the process proceeds to step S6-8. When the same ID is detected, the potential value (Pb) corresponding to the detected information ID (hereinafter referred to as IDb) is read (step S6-5), and the potential value (hereinafter referred to as Pa) of information a is compared with Pb. (Step S6-6). As a result of the comparison, if the value of Pa, which is the potential value of the received information a, is equal to or less than the value of Pb, it is assumed that the information has already been transmitted to another terminal device, and the process ends. If the value of Pa exceeds the value of Pb, the value of Pb is rewritten to the value of Pa (step S6-7). Next, the potential value corresponding to IDa of the received information a is read from the information management DB 22. It is determined whether or not the read potential value is less than or equal to a preset threshold value (step S6-8). If it is less than or equal to the threshold value, the process ends. If the threshold value is exceeded, it is determined whether or not there is a terminal device 10 to be a communication partner (step S6-9). If the terminal device 10 does not exist, the process ends. If the terminal device 10 exists, the received information a, the ID of the information a, and the potential value obtained by subtracting a certain value from the received potential value are transferred to the terminal device 10 (step S6-10).

FIG. 7 is a flowchart showing information deletion processing using the potential value as an index, which is periodically performed in the terminal device 10.
First, in the information management unit 23, the process is started at regular intervals (step S7-1). Next, the potential values of all information managed from the information management DB 22 are decreased by a predetermined value (step S7-2). Next, it is determined whether or not the potential value is equal to or lower than a predetermined threshold (step S7-3). If the threshold is exceeded, the process is terminated. If the value is equal to or less than the threshold, the corresponding information is deleted from the information management DB 22 (step S7-4).
Since the potential value decreases with time by the above processing, information is deleted as time passes. Therefore, even when the user moves while holding the terminal device 10, the potential decreases according to the moving time, and thus the possibility that information is taken far away is reduced. Note that the fixed time for starting the processing depends on how much the information is new and how much the user's movement distance is allowed.

FIG. 8 is a flowchart showing processing when the communication control unit 24 detects the terminal device 10 that becomes a new communication partner.
First, the communication control unit 24 detects the presence of the terminal device 10 that becomes a new communication partner (step S8-1). Next, the information management unit 23 reads information from the information management DB 22 (step S8-2). The potential value of the read information is read, and it is determined whether or not the potential value is equal to or less than a predetermined threshold (step S8-3). If it is equal to or smaller than the threshold value, the process proceeds to step S8-5. If the threshold value is exceeded, the read information and the potential value obtained by subtracting a certain value from the ID and potential value of the information are transferred via the communication control unit 24 to the terminal device 10 that is the communication partner (step S8). -4). Next, it is determined whether all information has been read out from the information management DB 22 (step S8-5). If all the information has not been read, the process returns to step S8-2. If all the information has been read, the process ends (step S8-5).

9 and 10 are flowcharts showing processing when the terminal device 10 receives additional information. 9 and 10 show a series of processes, and symbol A in both figures indicates the continuation of the process.
First, the communication control unit 24 receives additional information (hereinafter, additional information a) (step S9-1). Next, the information management unit 23 reads the ID of the added original information (hereinafter referred to as RIDi) included in the format of the additional information a, and detects the same ID as RIDi from the information management DB 22 (step S9-2). ). As a result of the detection (step S9-3), if the same ID does not exist, the process ends. If the same ID (hereinafter referred to as IDb) is detected, next, the same ID as the ID of the received additional information a (hereinafter referred to as IDa) is detected from the information management DB 22 (step S9-4). If the same ID is not detected as a result of the detection (step S9-5), the content of the additional information a is added to the information b corresponding to the detected IDb that is the source of the additional information a (step S9-9). ). Then, Pa which is the potential value of the additional information a is set to Pb which is the potential value of the information b, and the process proceeds to the sign A (step S9-10). On the other hand, when the same ID as IDa (hereinafter, IDc) is detected in step S9-5, Pc, which is a potential value corresponding to IDc, is read from the information management DB 22 (step S9-6). The potential values Pa and Pc corresponding to IDa are compared (step S9-7). If the comparison result Pa is less than or equal to Pc, the process ends. When the value of Pa exceeds the value of Pc, the potential value Pb of the information b that is the source of the additional information a is increased by a value corresponding to Pa−Pc and set as a new Pb, and the process proceeds to symbol A. (Step S9-8).

Next, it is determined whether or not the value of Pb exceeds a predetermined upper limit value (step S9-11). When it does not exceed the predetermined upper limit value, the process proceeds to the next process, and when it exceeds the predetermined upper limit value, the predetermined upper limit value is set as the value of Pb (step S9-12). Next, the value of Pb is written back to the information management DB 22 (step S9-13). Next, it is determined whether or not the value of Pa, which is the potential value of the additional information, is equal to or less than a preset threshold value (step S9-15). If it is less than or equal to the threshold value, the process ends. If the threshold value is exceeded, it is determined whether or not there is a terminal device 10 to be a communication partner (step S9-15). If the terminal device 10 does not exist, the process ends. When the terminal device 10 exists, the additional information a, IDa, and the potential value (Pa ′) obtained by subtracting a certain value are transferred to the terminal device 10 (step S9-16).
By performing the above processing, when information is added, the potential value increases, so the distribution range can be further expanded. However, if the information is added many times in a short time, the value of the potential value increases without limit. Therefore, it is necessary to set the upper limit value appropriately. The upper limit value may be a value that can be uniformly set in the terminal device 10, and a maximum value that can be set as the potential value of the information source is determined in advance, and that value may be set as the upper limit value.

FIG. 11 is a diagram illustrating a change in the potential value of information under a situation where the communication state of the terminal device 10 owned by the user in the wireless communication system 1 changes.
The terminal devices 10 connected by arrows in FIGS. 9A, 9B, and 9C indicate that communication is possible. Further, as a premise, in each terminal apparatus 10, it is assumed that the decrease value of the potential value at the time of transfer is set to 10 in advance. In addition, it is assumed that 5 is set in advance as the decrease value of the potential value every hour. As for the additional information, it is assumed that 10 is set in advance as the increase value of the potential value, and 1 is set as the decrease value of the potential value when the additional information is transferred. Further, it is assumed that 0 is set in advance as the threshold value of the potential value for deleting information. Further, it is assumed that 100 is set as the upper limit value.

  First, in FIG. 6A, the terminal device 10-5 cannot communicate with the other terminal devices 10-1, 10-2, 10-3, and 10-4, that is, within the radio wave range of the other terminal device. It is not in the state. Here, the terminal device 10-1 generates the information a posted on the bulletin board, assigns an ID using the above-described GUID, and sets 100 as the potential value. The terminal device 10-1 transfers the information a on the bulletin board to the terminal device 10-2 and the terminal device 10-3 that can perform direct wireless communication. The potential value is transferred as 90. The terminal devices 10-2 and 10-3 that have received the information a confirm that the ID of the received information a does not exist in their own information management DB 22, and register the received information a in the information management DB 22. Next, since the terminal device 10-2 can wirelessly communicate with the terminal device 10-4, the information device a is transferred with the potential value of 80. The terminal device 10-4 that has received the information a also registers the information a in its own information management DB 22. Here, when 1 hour elapses, the potential value of the information a in the terminal device 10-1 decreases to 95, the potential value of the information a in the terminal devices 10-2 and 10-3 decreases to 85, and the terminal device 10 At -4, the potential value of information a decreases to 75. When the additional information a having the information a as parent information is added in the terminal device 10-1, the additional information a is transferred to the terminal devices 10-2, 10-3, and 10-4. As a result, the potential value of the information a in the terminal device 10-1 is 105 (95 + 10). Here, since the upper limit value of the potential value is set to 100, 100 is set as the potential value of the information a. Will be. In the terminal devices 10-2 and 10-3, the potential value of the information a is 94 (95 + 10-1), and in the terminal device 10-4, the potential value is 83 (75 + 10-2).

  Next, a case where the terminal device 10-5 has moved to a position where it can communicate with the terminal devices 10-2 and 10-4 will be described as shown in FIG. When the terminal device 10-5 can perform wireless communication with the terminal devices 10-2 and 10-4, the terminal device 10-5 receives the information a from both the terminal device 10-2 and the terminal device 10-4. The terminal device 10-5 is 84 (94-10) which is the potential value of the information a received from the terminal device 10-2 and 73 (83-10) which is the potential value of the information a received from the terminal device 10-4. And 84, which is a larger value, is registered in its own information management DB 22 as the potential value of the information a.

  Next, a case where the terminal device 10-4 has moved to a position where communication is not possible will be described as shown in FIG. In this case, no information is transferred from any terminal device to the terminal device 10-4, and the potential value of the information a of the terminal device 10-4 decreases as time elapses. It is deleted from the terminal device 10-4. If it becomes possible to communicate with the other terminal apparatuses 10-1, 10-2, 10-3, 10-5 before being deleted, the information a is transferred to the other terminal apparatuses 10-1, 10-2, 10-. 3 and 10-5. Then, the received potential value of the information a and the potential value of the information a stored in its own information management DB 22 are compared, and a larger value is registered in the information management DB 22 as the potential value of the information a. In addition, when the terminal device 10-4 moves and can communicate with a terminal device other than the terminal devices 10-1, 10-2, 10-3, and 10-5, information a is stored in the terminal device. However, since the potential value decreases with the movement time, it is deleted in a short time.

FIG. 12 is a diagram showing the relationship between the maximum distance that information can reach when transferring information and the distribution range determined by the potential value.
Since the potential value decreases as the terminal device 10 transfers information by the above-described processing, the number of times of transfer is limited as a result. It becomes. The figure shows the case where the reach distance is maximum, and the boundary of the radio wave range 15 (15-1, 15-2, 15-2, 15-4) of the terminal device 10 to which each terminal device 10 is adjacent. The maximum reachable distance, i.e., the maximum delivery range, is positioned linearly. Actually, the communication is performed in a range shorter than the distance of the wireless communication, and the direction in which the communication partner exists is also random. Therefore, the transmission is performed only at a distance shorter than the maximum distance as the linear distance.

  The terminal device described above has a computer system inside. The above-described processing steps such as transmission / reception of information and subtraction and addition of potential values are stored in a computer-readable recording medium in the form of a program, and the above processing is performed by the computer reading and executing the program. Is done. Here, the computer-readable recording medium means a magnetic disk, a magneto-optical disk, a CD-ROM, a DVD-ROM, a semiconductor memory, or the like. Alternatively, the computer program may be distributed to the computer via a communication line, and the computer that has received the distribution may execute the program.

It is a block diagram which shows the terminal device and radio | wireless communications system by this embodiment. It is a block diagram which shows the internal structure of the terminal device in the embodiment. It is a figure which shows the data structure of the information management database in the embodiment. It is a figure which shows the communication format at the time of transmission / reception in the embodiment. It is the flowchart which showed the process when the new information in the same embodiment was produced | generated. It is the flowchart which showed the process at the time of receiving the new information in the embodiment. It is a flowchart of the deletion process of the information which made the potential value performed as a parameter | index regularly in the same embodiment. It is the flowchart which showed the process at the time of detecting the terminal device 10 used as the new communicating party in the embodiment. It is the flowchart (the 1) which showed the process at the time of receiving the additional information in the embodiment. It is the flowchart (the 2) which showed the process at the time of receiving the additional information in the embodiment. It is a figure for demonstrating the change of the potential value under the condition where the communication state of the terminal device 10 in the embodiment changes. It is the figure which showed the relationship between the maximum distance and the potential value in the same embodiment.

Explanation of symbols

10 Terminal device 22 Information management DB
23 Information Management Unit 24 Communication Control Unit

Claims (7)

In a terminal device that wirelessly connects to the other terminal device and transmits / receives information to / from the other terminal device when present within a predetermined distance from the other terminal device,
An information storage unit that stores uniquely-identifiable identification information given in advance to the information in association with a preset transferable value of the information;
Reception information registration means for receiving the information, the identification information corresponding to the information, and the transferable value from the other terminal device, and registering the information, the identification information, and the transferable value in the information storage unit When,
After being registered by the reception information registration means, the transferable value corresponding to the information is read from the information storage unit, and when the transferable value exceeds a predetermined threshold, the information and the information corresponding to the information are read Transfer means for transferring the identification information and a value obtained by subtracting a predetermined first subtraction value from the read transferable value to the other terminal device wirelessly connected;
A terminal device comprising: The transferable value corresponding to the information stored in the information storage unit at a predetermined time interval is read, and a value obtained by subtracting a predetermined second subtraction value from the transferable value is used as the transferable value. First updating means for updating the storage unit;
After the transferable value is updated by the first updating means, the transferable value corresponding to the information is read from the information storage unit, and the information is transferred when the transferable value is a predetermined threshold value or less. Deleting means for deleting from the information storage unit,
The terminal device according to claim 1, further comprising:   When registering new information in response to a user instruction, the identification information is added to the information, and a predetermined initial value is set as the transferable value of the information and registered in the information storage unit. The terminal device according to claim 1, further comprising an information registration unit. The reception information registration means includes:
When the received identification information exists in the information storage unit, the larger one of the transferable value corresponding to the identification information existing in the information storage unit and the received transferable value can be transferred The terminal device according to claim 1, wherein the terminal device is registered as a value in the information storage unit. The reception information registration means includes:
Additional information receiving means for receiving additional information for the information and the identification information of the information to which the additional information is added from the other terminal device;
When the identification information received by the additional information receiving means exists in the information storage unit, a predetermined addition value is added to the transferable value corresponding to the identification information, and the transferable value after the addition When the value does not exceed a predetermined upper limit value, the information storage unit is updated with the transferable value after addition as the transferable value, and when the predetermined upper limit value is exceeded, the predetermined upper limit value is transferred. Second update means for updating the information storage unit as possible values;
The terminal device according to any one of claims 1 to 4, further comprising: An information storage unit that stores uniquely-identified identification information that is preliminarily assigned to information and a preset transferable value that indicates whether the information can be transferred is stored in a predetermined distance from other terminal devices. When present, in a communication method of a terminal device wirelessly connected to the other terminal device and transmitting / receiving the information to / from the other terminal device,
Receiving the information, the identification information corresponding to the information, and the transferable value from the other terminal device;
Registering the received information, the identification information, and the transferable value in the information storage unit;
Reading the transferable value corresponding to the information from the information storage unit;
When the read transferable value exceeds a predetermined threshold, the information, the identification information corresponding to the information, and a value obtained by subtracting a predetermined first subtraction value from the read transferable value are wirelessly connected. Transferring to the other terminal device,
A communication method comprising: An information storage unit that stores uniquely-identified identification information that is preliminarily assigned to information and a preset transferable value that indicates whether the information can be transferred is stored in a predetermined distance from other terminal devices. When present, a computer of the terminal device that wirelessly connects to the other terminal device and transmits and receives the information to and from the other terminal device.
Reception information registration means for receiving the information, the identification information corresponding to the information, and the transferable value from the other terminal device, and registering the information, the identification information, and the transferable value in the information storage unit ,
The transferable value corresponding to the information is read from the information storage unit, and when the transferable value exceeds a predetermined threshold, the information, the identification information corresponding to the information, and the read transferable value are predetermined. Transfer means for transferring the value obtained by subtracting the first subtraction value to the other terminal device wirelessly connected;
Computer program to function as.

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