JP2006303762A - Method, system, and device for data communication - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and system for multihop Peer-to-Peer communication which allows a user to voluntarily acquire contents or data at his own will. <P>SOLUTION: The communication method includes a step for detecting another wireless terminal present in the range directly communicable with an own terminal, a step for storing a public data disclosed to the user of other wireless terminal in a public data storing means, a step for generating and disclosing a list of attributes consisting of data name, discloser terminal or the like about the public data, for sharing with other wireless terminals, a step for transmitting a request for the public data in the list of them to other wireless terminals which are directly communicable , and a step which receives the public data request from other wireless terminals, and if the requested public data is stored in the public data storing means of the own terminal, generates a response telegram addressed to the wireless terminal of a requester that contains the public data, for transmitting to other wireless terminals that are directly communicable. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a communication method in a wireless network having an indefinite topology constituted by a mobile phone, a PHS (Personal Handyphone System), and the like, and in particular, a plurality of wireless terminals participating in the wireless network perform data transmission by multihop peer-to-peer communication. The present invention relates to a communication method and system and apparatus for transmitting and receiving data.

As a method for performing multi-hop Peer-to-Peer communication that does not have a base station in a wireless network that includes a plurality of wireless terminals and whose topology changes from time to time, for example, there is one disclosed in Patent Document 1 below.
JP, 2003-333079, A When a wireless terminal acquires contents and wants to introduce this to others, the wireless terminal refers to a routing table and transmits contents to other wireless terminals. Is a way to transfer.

However, in the invention disclosed in the above-mentioned Patent Document 1, it is a method in which each user transfers content that he / she wants to introduce to other users to another user's wireless terminal, and content he / she does not want to introduce (A user who has previously obtained content is determined not to be good) is not transferred to another user's wireless terminal. For this reason, there is a high possibility that the content whose personal preference is clearly divided is not transferred to the entire network, and subsequent users cannot obtain the content.
In addition, there is no method for each user to acquire the content independently, and since the content is transferred unilaterally from the wireless terminal of the other user, the user himself / herself has no content on the network. There is a problem in that it is impossible to download necessary information from the network when necessary when it is necessary, without knowing whether it exists.
In addition, although there is a function of transferring content to another user's wireless terminal, there is a problem in that it is not possible to easily specify a group such as a member that is frequently changed or a large number of members as a transfer destination. For example, if you want to easily build a simple network using wireless terminals (such as an employee's mobile phone or PHS) in an office and want to realize data distribution (for example, regular contact) between employees, There is a problem in that a group consisting of a group is defined and information cannot be transferred only to the group members.

The object of the present invention is to further increase the number of people to whom content or data is transferred when performing peer-to-peer communication between terminals in a wireless network having an indefinite topology, and each user has his own It is an object of the present invention to provide a communication method and system for performing multi-hop Peer-to-Peer communication that can voluntarily obtain contents or data.
Another object of the present invention is to provide a communication method, system, and apparatus for performing multi-hop Peer-to-Peer communication that can publish content or data by limiting a group of arbitrary groups.

In order to achieve the above object, a communication method for performing multi-hop peer-to-peer communication according to the present invention is a communication method in which a plurality of wireless terminals participating in a wireless network transmit and receive data by multi-hop peer-to-peer communication. Because
Each wireless terminal
A first step of detecting other wireless terminals existing in a range where communication with the own terminal can be directly performed, and storing the detected identification information of the other wireless terminals in the directly communicable terminal table; A second step of storing public data to be disclosed to the users of other wireless terminals in the public data storage means, and a list of attributes including data names, public source terminals, etc. for the public data stored in the public data storage means And a list of the public data stored in the public data list storage means between the third step of storing the data in the public data list storage means and the other wireless terminal detected in the first step. Compared to the above, it is possible to communicate in a wireless network by additionally storing in the public data list storage means a list of public data published by other wireless terminals other than its own terminal A fourth step of displaying and outputting the list of public data after all the wireless terminals share a list of public data disclosed by all the line terminals, and in the list of the public data displayed and output An acquisition request for any of the public data is received from the user, a public data acquisition request message with the public data source terminal as a destination is created, and addressed to the other wireless terminals stored in the directly communicable terminal table A fifth step of transmission and a request source including the public data if the public data acquisition request from another wireless terminal is received and the requested public data is stored in the public data storage means of the own terminal Create a response message addressed to the other wireless terminal, send it to the other wireless terminals stored in the directly communicable terminal table, and the requested public data is published by the own terminal. If it is not stored in the data storage means, the acquisition request is addressed to other wireless terminals other than the transmission source terminal immediately before the public data acquisition request message among other wireless terminals stored in the directly communicable terminal table. The sixth step of relay transmission to the terminal and a response message for the public data acquisition request, and if the response message is addressed to the own terminal, the public data in the response message is stored in the public data storage means If the message is not addressed to the own terminal, the response message is relay-transmitted to other wireless terminals excluding the relay terminal immediately before the response message among the other wireless terminals stored in the directly communicable terminal table. And an eighth step of outputting the public data stored in the public data storage means to an output means such as a display screen.
In addition, in the second step, for the public data that restricts the publication target destination, the publication target destination designation information for designating the publication target destination is received from the user, and the publication target designation information is added to the public data to perform the publication. Stored in the data storage means, added to the attribute of the public data in the third step and stored in the public data list storage means, and in the fourth step, the disclosure target designation information set in the terminal itself Only the public data list in which the same disclosure target designation information is set is displayed.

In the communication system according to the present invention, each wireless terminal
A first means for detecting other wireless terminals existing in a range in which communication with the own terminal can be directly performed, and storing the detected identification information of the other wireless terminals in a directly communicable terminal table; A second means for storing public data to be disclosed to users of other wireless terminals in the public data storage means, and a list of attributes including data names, public source terminals, etc. for the public data stored in the public data storage means A list of public data stored in the public data list storage means between the third means for creating and storing in the public data list storage means and the other wireless terminal detected by the first means. Compared to the above, all the wireless terminals communicable in the wireless network can be obtained by additionally storing in the public data list storage means a list of public data published by other wireless terminals other than its own terminal. After the open data list is shared by all wireless terminals, a fourth means for displaying and outputting the public data list, and a public data list stored in the public data list storage means Accept an acquisition request for any public data from the user, create a public data acquisition request message destined for the public data source terminal, and send it to other wireless terminals stored in the directly communicable terminal table If the public data acquisition request from another wireless terminal is received and the requested public data is stored in the public data storage means of the own terminal, the request source including the public data is received. Create a response message addressed to the wireless terminal, send it to another wireless terminal stored in the directly communicable terminal table, and the requested public data is the public data of the terminal itself If it is not stored in the storage means, the acquisition request is relayed to other wireless terminals other than the transmission source terminal immediately before the public data acquisition request message among other wireless terminals stored in the directly communicable terminal table The sixth means for transmitting and the response message for the public data acquisition request are received, and when the response message is addressed to the own terminal, the public data in the response message is stored in the public data storage means, If the message is not addressed to the terminal, the response message is relay-transmitted to other wireless terminals other than the relay terminal immediately before the response message among the other wireless terminals stored in the directly communicable terminal table. And an eighth means for outputting the public data stored in the public data storage means to an output means such as a display screen.
A wireless terminal device according to the present invention is a wireless terminal that transmits and receives data by multi-hop peer-to-peer communication,
A first means for detecting other wireless terminals existing in a range in which communication with the own terminal can be directly performed, and storing the detected identification information of the other wireless terminals in a directly communicable terminal table; A second means for storing public data to be disclosed to users of other wireless terminals in the public data storage means, and a list of attributes including data names, public source terminals, etc. for the public data stored in the public data storage means A list of public data stored in the public data list storage means between the third means for creating and storing in the public data list storage means and the other wireless terminal detected by the first means. Compared to the above, all the wireless terminals communicable in the wireless network can be obtained by additionally storing in the public data list storage means a list of public data published by other wireless terminals other than its own terminal. After the open data list is shared by all wireless terminals, a fourth means for displaying and outputting the public data list, and a public data list stored in the public data list storage means Accept an acquisition request for any public data from the user, create a public data acquisition request message destined for the public data source terminal, and send it to other wireless terminals stored in the directly communicable terminal table If the public data acquisition request from another wireless terminal is received and the requested public data is stored in the public data storage means of the own terminal, the request source including the public data is received. Create a response message addressed to the wireless terminal, send it to another wireless terminal stored in the directly communicable terminal table, and the requested public data is the public data of the terminal itself If it is not stored in the storage means, the acquisition request is relayed to other wireless terminals other than the transmission source terminal immediately before the public data acquisition request message among other wireless terminals stored in the directly communicable terminal table The sixth means for transmitting and the response message for the public data acquisition request are received, and when the response message is addressed to the own terminal, the public data in the response message is stored in the public data storage means, If the message is not addressed to the terminal, the response message is relay-transmitted to other wireless terminals other than the relay terminal immediately before the response message among the other wireless terminals stored in the directly communicable terminal table. And an eighth means for outputting the public data stored in the public data storage means to an output means such as a display screen.

According to the present invention, a list of data that each user intends to publish is disclosed as a public data list to other wireless terminals existing in a range where direct communication is possible. Then, by comparing the public data list between wireless terminals capable of direct communication, a list of public data published by all of the wireless terminals that can communicate directly and indirectly within the wireless network is made shared. .
Then, if the user performs an acquisition request operation on any of the public data in the public data list, another wireless terminal that exists in a range where it can communicate directly from its own terminal by creating an acquisition request message to the publisher Send to. This public data acquisition request message is transmitted to the public wireless terminal via another wireless terminal that can communicate directly from the terminal itself. If the publishing wireless terminal is not in a range where direct communication is possible, the information is indirectly transmitted via another wireless terminal existing in the communication range with the publishing wireless terminal.
The public wireless terminal creates a response message including the requested public data and transmits it to the requesting wireless terminal. The wireless terminal that has received the response message of the publishing source stores the public data in the response message in the public data storage means of its own terminal if the response message is addressed to itself, and directly communicates if it is not addressed to its own terminal. Relay to other possible wireless terminals.
As a result, a user who owns each wireless terminal can proactively acquire public data published in the wireless network.
In addition, by detecting other wireless terminals that exist in a range that can communicate directly with the terminal itself at a predetermined time interval, and making the list of public data published in the wireless network shared, the topology can be Even in a dynamically changing environment, it is possible to reliably acquire necessary public data.
In this case, instead of putting the public data itself in the shared state, the public data list is put in the shared state, thereby reducing the data transfer load in the wireless network. You can know what data is published without referring to it one by one.

On the other hand, when data that is referred to only by a specific group is disclosed, the information specifying the disclosure target is added to the disclosed data. Then, in each wireless terminal that refers to the public data of only that specific group, the same information as the public target designation information is set, and a list of public data of the same public target designation information as the set information is displayed. Share data and send and receive public data within the same group.
As a result, it is possible to publish content or data by limiting a group consisting of an arbitrary group and refer to each other.
In this case, as the information for specifying the disclosure target destination, the unique identification information (mobile phone number or mail address) of the publishing wireless terminal in the specific group is used as it is, or the publishing user sets the identification information. The one with the added password information is used. This disclosure target designation information is separately notified to each user in the group by means such as e-mail. Thereby, it is possible to realize limited communication within the group without providing a management device for managing the group.
The data contents can be encrypted and transmitted / received as necessary.

Hereinafter, an embodiment of the present invention will be specifically described with reference to the drawings.
FIG. 1 is a system configuration diagram showing an outline of a configuration of a wireless network system according to an embodiment of the present invention.
In this figure, a wireless terminal M1 (for example, a mobile phone, PHS) carried by a user 101 can control mutual data exchange with wireless terminals held by other users.
Here, the wireless terminal M1 is a portable information terminal composed of a mobile phone, a PHS, or the like.
The wireless terminal M1 performs processing for detecting other wireless terminals existing in its own communicable area at predetermined time intervals, and there is a response from the other wireless terminal M2, and the wireless terminal 2 is within its own communicable area. When it is determined that the data exists, a list of public data (list of public contents) held by the wireless terminal M2 is sent and received and compared, and the public data held by each Set the list (list of published contents) to shared status.
Similarly, the wireless terminal M2 performs processing for detecting other wireless terminals in its own communicable area at predetermined time intervals, and there is a response from the other wireless terminal M4, and the wireless terminal M2 is in its own communicable area. When it is determined that M4 exists, a list of public data (list of public contents) held by each wireless terminal M4 is transmitted and compared, and the public data held by each is compared. Set the data list (list of published contents) to the shared state.

Similarly, the wireless terminal M4 performs processing for detecting other wireless terminals in its own communicable area at predetermined time intervals, and there is a response from the other wireless terminals M5 and M9, and wireless communication is performed in its own communication area. When it is determined that the terminals M5 and M9 exist, a list of public data (list of public contents) held by the wireless terminals 5 and 9 is sent and received, and compared. Set the list of public data that is held (list of public contents) to the shared state.
Similarly, the wireless terminal M9 performs processing for detecting other wireless terminals in its own communicable area at predetermined time intervals, and there is a response from the other wireless terminals M8 and M10, and wireless communication is performed in its own communication area. When it is determined that the terminals M8 and M10 exist, a list of public data (list of public contents) held between the wireless terminals M8 and M10 is transmitted and received and compared. Set the list of public data that is held (list of public contents) to the shared state.
Similarly, the wireless terminal M5 performs processing for detecting other wireless terminals in its own communicable area at predetermined time intervals, and there is a response from the other wireless terminal M6, and the wireless terminal M5 is in its own communicable area. When it is determined that M6 exists, a list of public data (list of public contents) held by each of the wireless terminals M6 is transmitted and compared, and the public data held by each is compared. Set the data list (list of published contents) to the shared state.

  As described above, a list of public data (list of public contents) held by all the wireless terminals M2, M4 to M10 except for the wireless terminal M3 existing outside the communication area 102 surrounded by a solid line in FIG. ) Are sequentially transmitted in a multi-hop format, so that a list of public data (list of public contents) held by the wireless terminals in the communication area 102 is shared.

  FIG. 2 is a diagram illustrating a configuration example of the wireless terminals M1 to M10, and includes the mobile phone 2 as illustrated in FIG. Alternatively, as shown in FIG. 2B, the mobile phone 2 (or PHS) is a portable personal computer (PC) connected as a communication terminal.

  FIG. 3 is a block diagram illustrating an example of a hardware configuration of the mobile phone 2 that configures the wireless terminals M1 to M10. As illustrated, the mobile phone 2 includes a CPU 301, a keypad 302 that configures an input device, Accepts data to be disclosed from display device 303, internal memory 304, handset 305 and call circuit 306, modem 307 for data communication, wireless transmission / reception circuit 308 and antenna 309, and external personal computer (PC) The interface 310 is configured.

The internal memory 304 stores, as a program group 311, an other terminal detection program 3111, a public data registration program 3112, a public data acquisition program 3113, a response program 3114, and an encryption / combination program 3115.
Also, a public data folder 3121, a public data list table 3122, a directly communicable terminal information table 3123, and a cache memory 3124 are provided.
The other terminal detection program 3111 detects other mobile phones existing in a range in which communication with the own terminal can be performed directly at a predetermined time interval, and stores the detected identification information of the other wireless terminals in the directly communicable terminal information table 3123. To do.
When detecting another mobile phone that is in a range where it can directly communicate with its own terminal, a nearby terminal detection message (described later) is created, and the cellular phone 2 transmits a call signal via the base station to this nearby terminal detection message. It transmits with the radio signal of the same frequency f as the radio frequency in the case of transmission / reception. Other mobile phones that have received this neighbor terminal detection message respond by creating a response message and transmitting it with a radio signal of the frequency f. The mobile phone of the detection source that has received this response message is able to directly communicate identification information that can identify the mobile phone as a mobile phone that is in the vicinity of its own terminal, that is, in a directly communicable range. Register in the table 3123.
When another mobile phone is in a call state, an e-mail transmission / reception state, or a location registration processing state to the base station, these processes are prioritized and no response message is returned. A mobile phone that has not returned a response message does not exist in a range where direct communication is possible (does not exist in the vicinity).

When a nearby mobile phone responds, the other terminal detection program 3111 acquires a public data list published by the mobile phone in the public data list table 3122, and is released by the other mobile phone. If there is public data not registered in the table 3122, the public data is additionally registered in the list table. The list of public data includes a plurality of attribute items such as a data name and a public source terminal.
The public data registration program 3112 is a program for registering, in the public data folder 3121, data that the owner of the own terminal discloses to other users. The public data registration program 3112 creates a list of public data registered in the public data folder 3121 on the condition that there is a public instruction from the user regarding the public data registered in the public data folder 3121, and the public data list table. 3122 is registered.
The public data acquisition program 3113 is a program for transmitting an acquisition request message for data published by other mobile phone users and acquiring it from a public mobile phone. In this case, the acquisition request message is relayed sequentially from the request source to other mobile phones in the vicinity to the open source mobile phone, but the cache memory 3124 of the other mobile phones existing on the relay path. If the public data requested by the request source remains, the mobile phone returns the public data in the cache memory 3124 to the request source.

The response program 3114 is a program for responding to each message when receiving a nearby terminal detection message, a public data acquisition request message, and a public data response message from another mobile phone.
The encryption / combination program 3115 encrypts public data that is referred to only by members belonging to a specific group in accordance with an instruction from a public user, and decrypts encrypted data received from other members. In this case, the encryption key is input from the keypad 302 by the user who made the publication. The decryption key is notified in advance from other users such as e-mail to other members of the same group.
When data that is referred to only by members belonging to a specific group is disclosed, a private channel number 3125 for identifying the specific group can be registered in advance in a part of the internal memory 304.
The cache memory 3124 temporarily stores messages sent and received with other mobile phones. When the remaining memory becomes low due to the temporarily stored message, the oldest time is deleted.

In the above configuration, the outline of the operation of each of the wireless terminals M1 to M10 in FIG. 1 is as follows.
(1) The wireless terminals M1 to M10 store the data to be disclosed in the public data folder 3121 according to the operation of each user.
FIG. 4 shows an example of public data stored in the public data folder 3121.
Each piece of public data includes a key ID 31212, a data name 31212, public data 31213, a data type 31214, a publisher terminal ID 31215, a copyright 31216, an update date 31217, and the like.
The key ID 3121 is an identification number unique to the public data 31213, and is arbitrarily set by the public user. In this case, when only members of a specific group are to be disclosed, the disclosure source user's mobile phone number (or mail address) and password are added to the end of the key ID. In the example of FIG. 4, for the public data with the key ID = KA0001, an example in which the mobile phone number 090123xxxx and the personal identification number 123 are added after the * sign is shown.
Note that the mobile phone number and personal identification number following the * symbol are displayed only on the wireless terminal set with the same number.
The publishing source terminal ID 31215 is composed of, for example, a mobile phone number or a mail address.

(2) When the user performs a public instruction operation on the data stored in the public data folder 3121, the wireless terminals M1 to M10 list public data on the public data stored in the public data folder 3121 of the own wireless terminal. Is created and stored in the public data list table 3122.
FIG. 5 shows an example of a public data list stored in the public data list table 3122.
The public data list includes attribute data such as a key ID 31221, a data name 31222, a publishing terminal ID 31223, an update date 31224, and a copyright 31224 of the public data, and does not include the public data itself.

(3) When it is time to detect other wireless terminals capable of direct communication, the wireless terminals M1 to M10 create a nearby terminal detection message and transmit it at the same frequency as the call frequency band. However, when the mobile phone constituting the wireless terminal is in a call state, a mail transmission / reception state, or a control signal transmission / reception state with the base station, this operation is given priority, and a neighbor terminal detection message is sent at a timing when these operations are not performed. Send.
For example, as shown in FIG. 6A, the neighboring terminal detection message includes a message type 601, a transmission source terminal ID 602, and a transmission time 603. Although the transmission source terminal ID 602 is indicated by M1 in FIG. 6, for example, a mobile phone number or a mail address that can specify the transmission source wireless terminal is used.

(4) The wireless terminals M1 to M10 that have received the neighbor terminal detection message transmit a neighbor response message as shown in FIG. However, when the mobile phone that constitutes the wireless terminal is in a call state, mail transmission / reception state, or control signal transmission / reception state with the base station, this operation is prioritized, and a neighborhood response message is transmitted at a timing when these operations are not performed. To do.
The neighborhood response message includes a message type 611, a response destination terminal ID 612, a response terminal ID 613, a public data list 614 disclosed by the own wireless terminal, and a response time 615. Although the response destination terminal ID 612 and the response terminal ID 613 are indicated by M1 and M2 in FIG. 6, for example, a mobile phone number or a mail address that can identify the wireless terminal of the transmission source is used.

(5) The wireless terminal that has received the neighbor response message recognizes that the wireless terminal indicated by the response terminal ID exists in the vicinity of the own wireless terminal and is capable of direct communication, and identifies the response terminal identification information ( Mobile phone number or mail address) is registered in the directly communicable terminal information table 3123.
FIGS. 7 to 10 show examples of information registered in the directly communicable terminal information table 3123 of the wireless terminals M1 to M10 in the presence state of FIG.
Information registered in the directly communicable terminal information table 3123 includes a terminal ID 31231, a status 31232, and a detection time 31233 of the wireless terminal that responds to the nearby terminal detection message.
The status 31232 is ON or OFF, and ON indicates that the responding wireless terminal can transmit / receive public data. OFF indicates that the responding wireless terminal is in a busy state such as a call state and cannot transmit / receive public data.

In the presence state of the wireless devices M1 to M10 in FIG. 1, since the wireless terminals M3 and M7 are separated by a distance that cannot be directly transmitted to or received from any wireless terminal, nothing is registered in the directly communicable terminal information table 3123.
In addition, the public data list shown in the public data list 614 in the neighborhood response message is compared with the public data list published by the own wireless terminal, and among the public data published by the responding wireless terminal. If there is public data that does not exist in the public data list of the own wireless terminal, the attribute of the public data is additionally registered in the public data list table 3122.
By performing this neighborhood response operation by each wireless terminal, a list of all public data published by all wireless terminals M1 to M10 (excluding M3 and M7) existing in the communication area 102 of FIG. The shared state is entered, and a list is displayed on the display device 303 of each wireless terminal.
FIG. 7 shows an example of a list of public data displayed as a list on the display device 303 of each wireless terminal.

(6) When the user who has viewed the list of public data performs an acquisition request operation on his / her own wireless terminal, the wireless terminal creates an acquisition request message for public data instructed by the user, and has the same radio frequency as the call frequency band. Transmit at frequency.
Here, taking as an example a case where the public source of the public data with the key ID = KA0002 is the wireless terminal M10, and the user of the wireless terminal M1 obtains this public data, the wireless terminal M1 is disclosed as shown in FIG. Create and send a data request message.
The public data request message includes a message type 1201, a destination terminal ID 1202, a transmission source terminal ID 1203, a request source terminal ID 1204, a public source terminal ID 1205, a public data key ID 1206, a request time 1207, and a telegram relay terminal ID 1208.
Since the wireless terminal M1 detects the wireless terminal M2 as a neighboring terminal, the wireless terminal M2 is set as the destination terminal ID, and the wireless terminal M10 is set as the disclosure source terminal ID. Further, the wireless terminal M1 is set as the transmission source terminal ID and the request source terminal ID.
This public data request message is received by the wireless terminal M2.
Note that the destination terminal ID 1202, the transmission source terminal ID 1203, the request source terminal ID 1204, the disclosure source terminal ID 1205, and the telegram relay terminal ID 1208 are also able to identify these wireless terminals, for example, mobile phone numbers or mail addresses, as described above. Is used.

Since the wireless terminal M2 does not hold the public data indicated by the public data key ID in the received request message, the request message is indicated by the transmission source ID among the wireless terminals M1 and M4 in the vicinity of the own wireless terminal M2. To the wireless terminal M4 excluding the wireless terminal M1 to be transmitted.
That is, as shown in FIG. 12B, the destination terminal ID in the request message received from the wireless terminal M1 is rewritten to the wireless terminal M4, and the transmission source terminal ID is rewritten to the wireless terminal M2 and transmitted to the wireless terminal M4. To do.
The wireless terminal M2 performs an operation of relaying the public data indicated by the public data key ID in the past, and when the wireless terminal M2 holds the data in the cache memory 3124, the wireless terminal M2 stores the public data stored in the cache memory 3124. Performs a reply to the requester.
This public data request message is received by the wireless terminal M4.

Since the wireless terminal M4 does not hold the public data indicated by the public data key ID in the received request message, the request message is transmitted from the wireless terminals M2, M5, and M9 in the vicinity of the own wireless terminal M4. To the wireless terminals M5 and M9 except for the wireless terminal M2.
That is, as shown in FIGS. 13A and 13B, the destination terminal ID in the request message received from the wireless terminal M2 is rewritten to the wireless terminals M5 and M9, and the source terminal ID is rewritten to the wireless terminal M4. Transmit to the wireless terminals M5 and M9.
In this case, the request message is transmitted from the wireless terminal M2 with the message relay terminal ID set.
This public data request message is received by the wireless terminals M5 and M9.

Since the wireless terminal M5 does not hold the public data indicated by the public data key ID in the received request message, the request message is indicated by the transmission source ID of the wireless terminals M4 and M6 in the vicinity of the own wireless terminal M5. To the wireless terminal M6 except for the wireless terminal M4.
That is, as shown in FIG. 14A, the destination terminal ID in the request message received from the wireless terminal M4 is rewritten to the wireless terminal M6, the transmission source terminal ID is rewritten to the wireless terminal M5, and transmitted to the wireless terminal M6. To do.
In this case, the request message is transmitted from the wireless terminals M2 and M4 with the message relay terminal ID set.

Since the wireless terminal M6 does not hold the public data indicated by the public data key ID in the received request message, the request message is indicated by the transmission source ID among the wireless terminals M5 and M10 in the vicinity of the own wireless terminal M6. To the wireless terminal M10 except the wireless terminal M5.
That is, as shown in FIG. 14B, the destination terminal ID in the request message received from the wireless terminal M5 is rewritten to the wireless terminal M10, and the transmission source terminal ID is rewritten to the wireless terminal M6 and transmitted to the wireless terminal M10. To do.
In this case, the request message is transmitted from the wireless terminals M2, M4, and M5 with the message relay terminal ID set.

On the other hand, since the wireless terminal M9 does not hold the public data indicated by the public data key ID in the request message received from the wireless terminal M4, the request message is transmitted to the wireless terminals M4, M8, The data is transmitted to wireless terminals M8 and M10 other than the wireless terminal M4 indicated by the transmission source ID in M10.
That is, as shown in FIGS. 15A and 15B, the destination terminal ID in the request message received from the wireless terminal M4 is rewritten to the wireless terminals M10 and M8, and the transmission source terminal ID is rewritten to the wireless terminal M9. Transmit to the radio terminals M10 and M8.
In this case, the request message is transmitted from the wireless terminals M2 and M4 with the message relay terminal ID set.

The wireless terminal M10 receives a request message for public data from the wireless terminals M6 and M9.
Here, assuming that the request message from the wireless terminal M6 has been received first, the wireless terminal M10 holds the public data indicated by the public data key ID in the public data folder 3121. Therefore, the public data is read out. Then, a public data response message as shown in FIG. 16A is created and transmitted to the wireless terminals M6 and M9 in the vicinity of the own wireless terminal M10.
That is, as shown in FIGS. 16A and 16B, destination terminal ID (1602) = M6, M9, transmission source terminal ID (1603) = M10, request source terminal ID (1604) = M1, publication source terminal A public data response message including ID = M10, public data key ID (1606) = GR0005, response time (1607) = t19, public data (1608) = music, and relay terminal ID = blank is created. Transmit to neighboring wireless terminals M6 and M9.

Since the requesting source ID in the public data response message received from the wireless terminal M10 is not the own wireless terminal, the wireless terminal M6 indicates the response message by the transmission source ID among the wireless terminals M5 and M10 in the vicinity of the own wireless terminal M6. To the wireless terminal M5 except the wireless terminal M10.
That is, as shown in FIG. 16A, the destination terminal ID in the response message received from the wireless terminal M10 is rewritten to the wireless terminal M5, the source terminal ID is rewritten to the wireless terminal M6, and transmitted to the wireless terminal M5. To do.

Since the request source ID in the public data response message received from the radio terminal M6 is not the own radio terminal, the radio terminal M5 indicates the response message by the source ID of the radio terminals M4 and M6 in the vicinity of the own radio terminal M5. To the wireless terminal M4 except the wireless terminal M6.
That is, as shown in FIG. 17B, the destination terminal ID in the response message received from the wireless terminal M10 is rewritten to the wireless terminal M5, the source terminal ID is rewritten to the wireless terminal M5, and transmitted to the wireless terminal M4. To do.

Since the request source ID in the public data response message received from the wireless terminal M5 is not the own wireless terminal, the wireless terminal M4 transmits the response message as a transmission source ID among the wireless terminals M2, M5, and M9 in the vicinity of the own wireless terminal M4. To the wireless terminals M2 and M9 except for the wireless terminal M5.
That is, as shown in FIGS. 18A and 18B, the destination terminal ID in the response message received from the wireless terminal M5 is rewritten to the wireless terminals M2 and M9, and the source terminal ID is rewritten to the wireless terminal M4. Transmit to the radio terminals M2 and M9.

Since the request source ID in the public data response message received from the radio terminal M4 is not the own radio terminal, the radio terminal M2 indicates the response message by the source ID of the radio terminals M1 and M4 in the vicinity of the own radio terminal M2. To the wireless terminal M1 except the wireless terminal M4.
That is, as shown in FIG. 18C, the destination terminal ID in the response message received from the wireless terminal M4 is rewritten to the wireless terminal M1, and the transmission source terminal ID is rewritten to the wireless terminal M2, and transmitted to the wireless terminal M1. To do.

  Since the request source ID in the public data response message received from the radio terminal M2 is the wireless terminal M1, the wireless terminal M1 captures the public data 1608 in the response message into the public data folder 3121.

On the other hand, since the request source ID in the public data response message received from the wireless terminal M10 is not the own wireless terminal, the wireless terminal M9 transmits the response message among the neighboring wireless terminals M4, M8, and M10 of the own wireless terminal M9. It transmits to wireless terminals M4 and M8 excluding the wireless terminal M10 indicated by the original ID.
That is, as shown in FIGS. 19A and 19B, the destination terminal ID in the response message received from the wireless terminal M10 is rewritten to the wireless terminals M4 and M8, and the source terminal ID is rewritten to the wireless terminal M9. Transmit to the wireless terminals M4 and M8.
The wireless terminal M4 that has received the public data response message from the wireless terminal M9 has already relayed a response message with the same request source, the same request time, and the same public data key ID from the wireless terminal M5. Does not relay response messages.
In addition, a response message from the wireless terminal M4 is transmitted to the wireless terminal M9, but the wireless terminal M9 has already received a response message with the same request source, the same request time, and the same public data key ID. When relaying, the relay operation is not performed. As a result, the response message is prevented from being patrolled. However, if the request source and the key ID are the same and the request time is different, the request source has made a retransmission request, so a relay operation is performed.

As described above, messages transmitted and received between wireless terminals are temporarily stored in the cache memory 3124 of each wireless terminal.
FIG. 20 shows an example of the contents of the cache memory of the wireless terminal M2.
When the wireless terminal M2 receives the public data request message from the wireless terminal M1, if the already requested public data is held in the cache memory 3124, the wireless terminal M2 The public data in the cache memory 3124 of the own wireless terminal M2 is read and sent back to the requesting wireless terminal M1 without being transmitted to the wireless terminal M4. The same applies to other wireless terminals.
In short, when each of the wireless terminals M1 to M10 holds the requested public data in the own wireless terminal in response to the public data acquisition request, the public data reaches the requesting wireless terminal. In addition, an operation of transmitting to a wireless terminal in the vicinity of the own wireless terminal is performed. As a result, the public data is transferred from the neighboring wireless terminal to the requesting wireless terminal through a transmission path of the neighboring wireless terminal. That is, public data is transferred to the requester in a multi-hop peer-to-peer format.

Hereinafter, a detailed processing procedure of each program realizing the above operation will be described with reference to flowcharts.
FIG. 4 is a flowchart showing an example of the public data registration process of the public data registration program 3111.
First, the public data registration program 3111 receives data to be disclosed from the input unit (keypad or handset) or the external input interface 310 (step 2101).
Next, attributes such as the key ID, data name, and data type of the data to be disclosed are received from the keypad 302 (step 2102).
Next, the attribute input in step 2102 is added to the accepted data to be disclosed and stored in the public data folder 3121 (step 2103).
Next, an inquiry is made to the user as to whether to release the stored data (step 2104).
If the user response is public OK, an item as shown in FIG. 5 for identifying the data stored in the public data folder 3121 is created and added to the public data list table 3122 (steps 2105 and 2106).
Finally, the user is notified that the data is open (step 2107).

FIG. 22 is a flowchart illustrating an example of the neighboring terminal detection process of the other terminal detection program 3112.
The other terminal detection program 3112 starts the detection time timer (T1) (step 2201) and clears the directly communicable terminal information table 3123 (step 2202).
Next, a neighbor terminal detection message as shown in FIG. 6 is created and the neighbor terminal detection message is transmitted (steps 2203 and 2204).
Next, it is determined whether or not a response message has been received. If a response message is received, identification information that can identify the wireless terminal indicated by the response terminal ID in the response message is stored in the directly communicable terminal information table 3123. Registration is performed (steps 2205 and 2206). It is also registered in the cache memory 3124.
Next, the public data list in the response message is compared with the public data list of the own terminal, and public data items that do not exist in the own terminal are additionally registered in the public data list table 3122 and displayed as public data on the display device 303. (Step 2207). However, the publisher is the own terminal, and those deleted by the own terminal are not added.
Next, it is determined whether or not the timer T1 has expired (step 2208). If it has not expired, reception of the response message is continued.
However, when the timer T1 expires, the pause time timer (T2) is started (step 2209), waits for the timer (T2) to expire, and if completed, returns to step 2201 to resume detection of neighboring terminals. (Step 2210).

FIG. 23 is a flowchart illustrating an example of the public data acquisition process of the public data acquisition program 3113.
The public data acquisition program 3113 receives a public data acquisition request from the keypad 302 as an input unit, and displays a list of public data stored in the public data list table 3122 on the display device 303 (steps 2301 and 2302).
Next, an operation for selecting any public data in the displayed public data list is accepted (step 2303).
Next, it is checked whether the selected public data exists in the cache memory 3124 or the public data folder 3121 (step 2304). If the selected public data exists in the cache memory 3124 or the public data folder 3121, the public data is read out. Is displayed on the display device 303 (step 2308).
In this case, if the public data is musical sound data or voice data, the sound is generated from a speaker (not shown).
On the other hand, if the selected public data does not exist in the cache memory 3124 or the public data folder 3121 in step 2304, a request message for the selected public data is created (step 2305).
Next, a public data request message is transmitted to all neighboring terminals recognized by the own terminal (step 2306).

FIG. 24 is a flowchart illustrating an example of response processing of the response program 3114.
When receiving a message from another wireless terminal, the response program 3114 determines the type of the received message (steps 2401 and 4022).
If the type of the received message is a neighbor terminal detection message, a neighbor response message (see FIG. 6) including the public data list held in the public data list table 3122 of the own terminal is created and addressed to the response destination terminal (Steps 2403 and 2404). Then, the neighborhood response message is registered in the cache memory 3124 (step 2405).
On the other hand, if the type of the received message is a public data request message, the received message is registered in the cache memory 3124, and then a response process to the public data request message shown in FIG. 25 is performed (steps 2406 and 2407). .
If the received message type is a public data response message, the received message is registered in the cache memory 3124, and then a response process to the public data response message shown in FIG. 26 is performed (steps 2408 and 2409). .

FIG. 25 is a flowchart showing details of the response process to the public data request message in step 2407 of FIG.
If the received message type is a public data request message, the response program 3114 determines whether the own terminal has already returned (relayed) the public data with the same request source, request time, and public data key ID. Is checked with reference to the cache memory 3124 (step 2501).
If public data having the same request source, request time, and public data key ID is stored in the cache memory 3124, it has been returned, and the response process is terminated (step 2502). .
However, if the public data having the same request source, request time, and public data key ID are not stored in the cache memory 3124, the requested public data is not returned to the request source. Therefore, it is next checked whether or not the publishing source terminal is its own terminal (step 2503).
If the publishing source is the self terminal, the public data indicated by the public data key ID is acquired from the public data folder 3121 of the self terminal (step 2505).
Then, a public data response message including the requested public data is created and transmitted to other wireless terminals in the vicinity of the terminal (steps 2506.2507).
Next, the transmitted public data response message is registered in the cache memory 3124 (step 2508).
On the other hand, if the publishing source terminal is not its own terminal, it is checked whether or not the public data indicated by the public data key ID exists in the cache memory 3124 (step 2504), and if it is held in the cache memory 3124. Indicates that the public data relayed in the past to another wireless terminal different from the current request source remains in the cache memory 3124, so the public data indicated by the public data key ID is stored in the cache memory 3124. Obtain (step 2505). Then, a public data response message including the requested public data is created and transmitted to other wireless terminals in the vicinity of the terminal (steps 2506.2507).
On the other hand, if the publishing terminal is not its own terminal and the requested public data is not held in the cache memory 3124, the public data request is sent to all of the neighboring wireless terminals recognized by the own terminal. A telegram is transmitted (step 2510).

FIG. 26 is a flowchart showing details of the response process to the public data response message in step 2409 in FIG.
When the received message is a public data response message, the response program 3114 caches whether the public data having the same request source, request time, and public data key ID has already been returned (relayed) to the request source. The memory 3124 is examined with reference to the memory 3124 (step 2601).
If it has already been returned (relayed) (step 2602), the response process is terminated.
However, if it has not been returned, it is determined by the request source terminal ID in the received message whether or not the request source terminal of the public data is its own terminal (step 2603).
When the request source terminal is not its own terminal, for all of the nearby wireless terminals recognized by the own terminal, except for the wireless terminal (terminal indicated by the source terminal ID) that transmitted the public data response message A public data request message is created and transmitted (steps 2604 and 2605).
Then, the transmitted public data response message is registered in the cache memory 3124 (step 2606).

On the other hand, if the request source terminal is the self terminal, the public data in the received response message is stored in the public data folder 3121 of the self terminal (step 2607). Then, the fact that the requested public data has been received is displayed on the display device 303 to notify the user (step 2608).
Next, an item for identifying the public data stored in the public data folder 3121 is created and added to the public data list table 3122 (step 2609).
In this case, public data published by other wireless terminal users is registered in the public data folder 3121. Whether or not to register can be appropriately selected by the user of the requesting wireless terminal. can do.
Even if the public data is publicly disclosed by other users, it is possible to prevent the response load of each wireless terminal from increasing when the acquisition requests for popular public data increase by registering in the public data folder 3121 of the terminal itself. In addition, the response speed to the request source can be increased.

As described above, according to the above embodiment, the following effects can be obtained.
(A) A user who owns each wireless terminal can independently acquire public data published in the wireless network.
(B) By detecting other wireless terminals existing in a range that can be directly communicated with the own terminal at a predetermined time interval and setting a list of public data published in the wireless network in a shared state, the topology Even in a dynamically changing environment, it is possible to reliably obtain necessary public data.
In particular, the transfer route is stored by the routing table as shown in the above-mentioned Patent Document 1, and the multi-hop communication is not realized by tracing the stored transfer route, but exists in a range where direct communication with the own terminal is possible. Other wireless terminals are detected at predetermined time intervals, and a public data acquisition request message and a response message are sequentially passed in relay form to other wireless terminals in a range where communication with the own terminal can be performed directly. Even if a wireless terminal that relayed a public data acquisition request moves to a location where communication is not possible in order to realize hop communication, the public data is requested from other wireless wireless terminals in the vicinity. Will be returned to.
Therefore, in the present invention, a routing table as shown in Patent Document 1 is not necessary.
(C) Rather than putting the public data itself in the shared state, by putting the public data list in the shared state, the data transfer load in the wireless network is reduced. You can know what data is published without referring to it one by one.
(D) Since contents such as music are not transferred via the base station, the user does not have to pay a usage fee for passing through the base station.

(Second Embodiment)
In the above description, the operation of transmitting / receiving public data by all the wireless terminals M1 to M10 existing in the communication area 102 has been described. However, in the present invention, public data that is referred to only by members in a specific group is described. You can send and receive.
For example, in a company organization, only members belonging to the sales department can refer to each other, and public data that cannot be referred to by members belonging to the technical department can be exchanged.
That is, when data that is referred to only by a specific group is disclosed, the information specifying the disclosure target destination is added to the disclosed data.
The information that designates the disclosure target is unique identification information possessed by the publishing wireless terminal in the specific group (password information set by the publishing user to the mobile phone number or email address (analogues other than group members) This disclosure target designation information is separately notified to each user in the group by means such as e-mail, etc. Thus, a management apparatus for managing the group It is possible to realize limited communication within a group without providing a network.
Specifically, as in the case of disclosing public data (data name = notice 1) with key ID = KA0001 in FIGS. 4 and 5, an asterisk (*) is added to the end of key ID = KA0001, and then the publishing user Information specifying the disclosure destination composed of a mobile phone number, a personal identification number, etc. is added and published.
In each wireless terminal that refers to the public data of only that specific group, the same information as the public target designation information is input from the keypad 302 and the private channel number 3125 is set in the internal memory 304.
Then, step 2207 in the neighboring terminal detection process of FIG. 22 is changed to a process as shown in FIG.

In FIG. 27, after receiving the neighbor terminal detection message from the neighbor terminal, if the neighbor terminal is registered in the directly communicable terminal table 3123, the public data list in the response message is compared with the public data list of the own terminal, An item of public data that does not exist in the own terminal is additionally registered in the public data list table 3122. When this registered public data list is displayed, it is determined whether a private channel number is set in the own terminal (step 22071). If it has been set, only the list of public data of the key ID in which the same private channel number as that of the own terminal in the public data list table 3122 is set is displayed on the display device 303 (step 303). 22072).
However, if the private channel number is not set in the terminal itself, only the list of public data for which the private channel number is not set is displayed (step 22073).
Thereby, in a terminal to which a private channel number is set, only a public data list having the same key ID as the set number can be referred to. On the other hand, in a terminal for which a private channel number is not set, a public data list of a key ID having a private channel number is not displayed.
In this case, the list of all public data is shared regardless of whether the private channel number 3125 is set for each terminal. This is because the public data list of the key ID having the private channel number is sequentially propagated in a multi-hop manner via the wireless terminal for which the private channel number is not set.
Therefore, if a special device that looks into the contents of the cache memory 3124 is used, it is possible to refer to the public data of the key ID having the private channel number. It is desirable to encrypt the public data itself by the encryption / decryption program 3115.
As described above, it is possible to publish content or data by limiting a group of arbitrary groups and refer to each other.

(Third embodiment)
In the second embodiment, the configuration is such that the public data list is exchanged and shared among all wireless terminals regardless of whether the private channel number is set or not. It can be configured to determine whether a wireless terminal has the same private channel number as the terminal, and recognize it as a neighboring terminal only when the same private channel number is set and share the public data list .
With this configuration, it is not necessary to relay the public data list of other users than the same group member, and the load on the wireless terminal itself is reduced.

(Fourth embodiment)
In the first to third embodiments, the public data is input from the personal computer. However, the present invention is not limited to this.
For example, various sensor outputs may be input to the interface 310.
Specifically, the output of the GPS sensor is input, the current position of the wireless terminal is disclosed as public data, and this is periodically acquired by a wireless terminal owned by an administrator, supervisor, parents, etc. It is possible to reliably grasp the current position of the wireless terminal to which the sensor is attached. Since this does not involve a base station, it is possible to expect an extremely remarkable effect that the burden of paying a service fee to a trader who is currently performing a position detection service is reduced.
Further, the output of the monitoring camera is input to the interface 310, the image of the monitoring target area is released, and this is periodically acquired by the wireless terminal owned by the administrator, supervisor, etc. It can be used to grasp the presence or absence of abnormality.

1 is a system configuration diagram showing an outline of a configuration of a wireless network system according to the present invention. It is a figure which shows the structural example of the radio | wireless terminal used for this invention. It is a hardware block diagram which shows an example of the radio | wireless terminal used by this invention. It is a figure which shows the example of the public data stored in a public data folder. It is a figure which shows the example of the public data list stored in a public data list table. It is a figure which shows the structure of a neighborhood terminal detection message and a response message. It is a figure which shows the example of the information stored in the directly communicable terminal information table of the radio | wireless terminals M1-M3 of FIG. It is a figure which shows the example of the information stored in the directly communicable terminal information table of the radio | wireless terminals M4-M6 of FIG. It is a figure which shows the example of the information stored in the directly communicable terminal information table of the radio | wireless terminals M7-M9 of FIG. It is a figure which shows the example of the information stored in the directly communicable terminal information table of the radio | wireless terminal M10 of FIG. It is a figure which shows the example of the public data list displayed on a display apparatus. It is a figure which shows the example of the public data request message which the radio | wireless terminals M1-M2 of FIG. 1 transmit. It is a figure which shows the example of the public data request message which the radio | wireless terminal M4 of FIG. 1 transmits. It is a figure which shows the example of the public data request message which the radio | wireless terminals M5-M6 of FIG. 1 transmit. It is a figure which shows the example of the public data request message which the radio | wireless terminal M9 of FIG. 1 transmits. It is a figure which shows the example of the public data response message which the radio | wireless terminal M10 of FIG. 1 transmits. It is a figure which shows the example of the public data response message which the radio | wireless terminals M6 and M5 of FIG. 1 transmit. It is a figure which shows the example of the public data response message which the radio | wireless terminals M4 and M2 of FIG. 1 transmit. It is a figure which shows the example of the public data response message which the radio | wireless terminal M9 of FIG. 1 transmits. It is a figure which shows the example of the information stored in the cache memory of the radio | wireless terminal M1 of FIG. It is a flowchart which shows the process of the public data registration program of each wireless terminal. It is a flowchart which shows the process of the other terminal detection program of each radio | wireless terminal. It is a flowchart which shows the process of the public data acquisition program of each wireless terminal. It is a flowchart which shows the process of the response program of each radio | wireless terminal. It is a flowchart which shows the detail of a process of step 2407 in FIG. It is a flowchart which shows the detail of a process of step 2409 in FIG. It is a flowchart which shows the other example of step 2207 of the other terminal detection program of FIG.

Explanation of symbols

2 Mobile phone 101 User M1 to M10 Wireless terminal 3111 Other terminal detection program 3112 Public data registration program 3113 Public data acquisition program 3114 Response program 3121 Public data folder 3122 Public data list table 3123 Directly communicable terminal information table 3124 Cache memory 3125 Private channel number

Claims (4)

A communication method in which a plurality of wireless terminals participating in a wireless network transmit and receive data by multi-hop peer-to-peer communication,
Each wireless terminal
A first step of detecting other wireless terminals existing in a range in which communication with the own terminal can be directly performed, and storing the detected identification information of the other wireless terminals in a directly communicable terminal table;
A second step of storing in the public data storage means public data received from the user of the own terminal and disclosed to the user of the other wireless terminal;
A third step of creating a list of attributes including a data name, a publishing source terminal, and the like for the public data stored in the public data storage means, and storing the list in the public data list storage means;
A list of public data stored in the public data list storage means is compared with the other wireless terminals detected in the first step, and a public terminal that is open to other wireless terminals other than its own terminal. By additionally storing a list of data in the public data list storage means, a list of public data published by all wireless terminals capable of communication in the wireless network is shared by all the wireless terminals, and then the public data is released. A fourth step of displaying and outputting a list of data;
Accepting an acquisition request for any of the public data in the list of the public data displayed and output from the user, creating a public data acquisition request message destined for the public source terminal of the public data, and the directly communicable terminal table A fifth step of transmitting to another wireless terminal stored in
A response that receives a public data acquisition request from another wireless terminal, and if the requested public data is stored in the public data storage means of the terminal itself, a response that is addressed to the requesting wireless terminal including the public data Create a message, send it to another wireless terminal stored in the directly communicable terminal table, and if the requested public data is not stored in the public data storage means of the terminal, A sixth step of relaying to other wireless terminals excluding the source terminal immediately before the public data acquisition request message among other wireless terminals stored in the directly communicable terminal table;
When a response message for the public data acquisition request is received and the response message is addressed to the own terminal, the public data in the response message is stored in the public data storage means. A seventh step of relay-transmitting the response message to other wireless terminals other than the relay terminal immediately before the response message among the other wireless terminals stored in the directly communicable terminal table;
An eighth step of outputting the public data stored in the public data storage means to an output means such as a display screen;
A data communication method comprising: In the second step, for the public data for limiting the publication target destination, the publication target destination designation information for designating the publication target destination is received from the user, and the publication target designation information is added to the public data to store the public data. Stored in the means, and added to the attribute of the public data in the third step and stored in the public data list storage means,
2. The data according to claim 1, wherein in the fourth step, only a list of public data in which the same disclosure target designation information as the disclosure target designation information set in the terminal is set is displayed. Communication method. A communication system in which a plurality of wireless terminals participating in a wireless network transmit and receive data by multi-hop peer-to-peer communication,
Each wireless terminal
First means for detecting other wireless terminals existing in a range in which communication with the own terminal can be performed directly, and storing the detected identification information of the other wireless terminals in a directly communicable terminal table;
Second means for storing public data received from the user of the own terminal and made public to users of other wireless terminals in the public data storage means;
A third means for creating a list of attributes including a data name, a publishing source terminal, and the like for the public data stored in the public data storage means, and storing the list in the public data list storage means;
A list of public data stored in the public data list storage unit with other wireless terminals detected by the first unit is compared with each other, and a public terminal that is open to other wireless terminals other than its own terminal By additionally storing a list of data in the public data list storage means, a list of public data published by all wireless terminals capable of communication in the wireless network is shared by all the wireless terminals, and then the public data is released. A fourth means for displaying and outputting a list of data;
An acquisition request for any public data in the public data list stored in the public data list storage unit is received from the user, and a public data acquisition request message with the public data source terminal as a destination is created, and the direct data A fifth means for transmitting to other wireless terminals stored in the communicable terminal table;
A response that receives a public data acquisition request from another wireless terminal, and if the requested public data is stored in the public data storage means of the terminal itself, a response that is addressed to the requesting wireless terminal including the public data Create a message, send it to another wireless terminal stored in the directly communicable terminal table, and if the requested public data is not stored in the public data storage means of the terminal, Sixth means for relay transmission to other wireless terminals excluding the transmission source terminal immediately before the public data acquisition request message among other wireless terminals stored in the directly communicable terminal table;
When a response message for the public data acquisition request is received and the response message is addressed to the own terminal, the public data in the response message is stored in the public data storage means. A seventh means for relay-transmitting the response message to other wireless terminals other than the relay terminal immediately before the response message among the other wireless terminals stored in the directly communicable terminal table;
Eighth means for outputting the public data stored in the public data storage means to an output means such as a display screen;
A data communication system comprising: A wireless terminal device that transmits and receives data by multi-hop peer-to-peer communication,
First means for detecting other wireless terminals existing in a range in which communication with the own terminal can be performed directly, and storing the detected identification information of the other wireless terminals in a directly communicable terminal table;
Second means for storing public data received from the user of the own terminal and made public to users of other wireless terminals in the public data storage means;
A third means for creating a list of attributes including a data name, a publishing source terminal, and the like for the public data stored in the public data storage means, and storing the list in the public data list storage means;
A list of public data stored in the public data list storage unit with other wireless terminals detected by the first unit is compared with each other, and a public terminal that is open to other wireless terminals other than its own terminal By additionally storing a list of data in the public data list storage means, a list of public data published by all wireless terminals capable of communication in the wireless network is shared by all the wireless terminals, and then the public data is released. A fourth means for displaying and outputting a list of data;
An acquisition request for any public data in the public data list stored in the public data list storage unit is received from the user, and a public data acquisition request message with the public data source terminal as a destination is created, and the direct data A fifth means for transmitting to other wireless terminals stored in the communicable terminal table;
A response that receives a public data acquisition request from another wireless terminal, and if the requested public data is stored in the public data storage means of the terminal itself, a response that is addressed to the requesting wireless terminal including the public data Create a message, send it to another wireless terminal stored in the directly communicable terminal table, and if the requested public data is not stored in the public data storage means of the terminal, Sixth means for relay transmission to other wireless terminals excluding the transmission source terminal immediately before the public data acquisition request message among other wireless terminals stored in the directly communicable terminal table;
When a response message for the public data acquisition request is received and the response message is addressed to the own terminal, the public data in the response message is stored in the public data storage means. A seventh means for relay-transmitting the response message to other wireless terminals other than the relay terminal immediately before the response message among the other wireless terminals stored in the directly communicable terminal table;
Eighth means for outputting the public data stored in the public data storage means to an output means such as a display screen;
A wireless terminal device comprising:

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