JP2005045540A - Communication terminal device and group communication program allowed to be executed by computer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a communication terminal device enabling group communication having high mobility. <P>SOLUTION: Members of group communication around the communication terminal device 1 are set by transmitting/receiving a participation request packet REQUEST, a participation replay packet REPLY, a deletion report packet DELETE, and an identification code packet ID to/from other communication terminal devices 101 to 1-5 in a communication area 21 of the communication terminal device 1 concerned to perform the group communication or delete from the group communication. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a communication terminal device for performing group communication and a group communication program executable by a computer.

  As is well known, methods for mutual communication of data and the like between a plurality of communication terminal apparatuses include a method called broadcast, a method called multicast, and a method using these in combination. In the broadcast method, the data destination is not specified, and the data is transmitted to an unspecified number of communication terminal devices. The multicast method is to designate at least one destination and transmit data only to the destination communication terminal apparatus.

  For example, Patent Literature 1 assumes a communication network having a plurality of communication terminal devices as respective nodes, and sets a packet expiration date and a group expiration date (corresponding to a packet outgoing reply period). The outgoing packet is transmitted from any communication terminal device via the communication network, the outgoing packet is received by another communication terminal device within the packet validity period (broadcast), and the reply packet is transmitted within the group expiration date. A technique is disclosed in which group communication is performed by repeating transmission and reception (multicast) from one communication terminal apparatus to the arbitrary communication terminal apparatus and thereafter repeating multicast within the group.

In Patent Document 2, a temporary parent is selected and set from a plurality of communication terminal devices, and an optimal temporary parent communication terminal device is exchanged between the temporary parent communication terminal device and each of the other communication terminal devices. A technique is disclosed in which a communication network centering on this optimal temporary parent communication terminal device is set and group communication is performed by each communication terminal device.
JP 2001-285345 A JP-A-11-146030

  By the way, in the technology of Patent Document 1, it is assumed that all communication is performed with respect to a party (a set of unspecified communication terminal devices sharing the same interest), and belongs to the party in real time. The communication terminal device is fixed. For example, from a group of communication terminal devices A and B capable of direct communication, as well as from communication terminal devices B and C capable of direct communication even if direct communication between the communication terminals A and C is impossible. If there is a group, the communication terminal apparatus B is relayed to perform communication between the communication terminal apparatuses A and C, thereby establishing a party composed of the communication terminal apparatuses A, B, and C.

  However, in the communication terminal device A, it is not known whether the communication terminal device C belongs to a party, and the communication terminal device C cannot be listed as a party member. For this reason, when performing group communication between a plurality of users who are completely unknown, group communication is performed with an unidentified user who is completely unknown from the communication terminal device A, which is not preferable as a form of group communication. It was.

  Further, in the technique of Patent Document 2, for example, when a temporary parent communication terminal device withdraws from the group due to the movement of the temporary parent communication terminal device, the communication between the other communication terminal devices is terminated, and a new temporary parent The communication terminal device had to be set, and mobility was low.

  Accordingly, the present invention has been made in view of the above-described conventional problems, and an object thereof is to provide a communication terminal device that enables group communication with high mobility and a group communication program that can be executed by a computer. And

  In order to solve the above-described problems, the present invention provides a communication terminal device that performs group communication between a plurality of communication terminal devices, a participation request signal for requesting other communication terminal devices to participate in group communication, and the communication Transmitting means for transmitting the identification code of the terminal device, receiving means for receiving the participation response signal indicating participation in the group communication and the identification code of the other communication terminal device, and storing the received identification code of the other communication terminal device Storage means.

  Further, the present invention provides a receiving means for receiving a participation request signal for requesting participation in group communication and an identification code of another communication terminal device in a communication terminal device performing group communication among a plurality of communication terminal devices. A transmission means for transmitting a participation response signal indicating participation in group communication and an identification code of the communication terminal apparatus in response to reception of the participation request signal, and a memory for storing the received identification codes of other communication terminal apparatuses Means.

  Furthermore, the present invention relates to a participation request signal for requesting participation in group communication, a participation response signal indicating participation in group communication, and the communication in a communication terminal device performing group communication among a plurality of communication terminal devices. Transmission means for transmitting the identification code of the terminal device, reception means for receiving the participation request signal, participation response signal, and identification code of the other communication terminal device, and storage for storing the received identification code of the other communication terminal device And transmitting means transmits a participation request signal and an identification code of the communication terminal apparatus when requesting participation in group communication from another communication terminal apparatus, and requests for participation from other communication terminal apparatuses. When the signal is received by the receiving means, a participation response signal indicating participation in the group communication and an identification code of the communication terminal device are transmitted. When receiving a participation response signal and an identification code of another communication terminal device as a response to being transmitted by the communication means, and requesting participation in group communication from another communication terminal device, the other communication terminal device The participation request signal and the identification code of the other communication terminal apparatus are received.

  In the present invention, an identification code generating means for generating an identification code of the communication terminal device is provided.

  Furthermore, in the present invention, at least one of the participation request signal, the participation response signal, and the identification code of the communication terminal device is encrypted and transmitted / received.

  In the present invention, the transmission means transmits the participation request signal or the participation response signal, the reception means receives the participation request signal or the participation response signal, and the storage means repeatedly stores the identification code of the other communication terminal device. ing.

  Further, in the present invention, when the identification code of another communication terminal apparatus is received by the receiving means and stored in the storage means, and the identification code is not received again by the receiving means until a predetermined time elapses, The identification code is erased from the storage means.

  Further, the present invention provides an identification code generating means for generating an identification code of the communication terminal apparatus and a participation request for requesting participation in group communication in a communication terminal apparatus that performs group communication among a plurality of communication terminal apparatuses. A transmission means for transmitting a signal and an identification code of the communication terminal apparatus; a reception means for receiving a participation request signal and an identification code of another communication terminal apparatus; and a received identification code of the other communication terminal apparatus Storage means, and when the transmission means requests other communication terminal devices to participate in group communication, the transmission means transmits a participation request signal and an identification code of the communication terminal device, and participates from other communication terminal devices. When the request signal is received by the receiving means, the identification code of the communication terminal apparatus is transmitted, and the receiving means responds to the participation request signal being transmitted by the transmitting means. As an answer, when receiving an identification code of another communication terminal device and requesting participation in group communication from another communication terminal device, the participation request signal from the other communication terminal device and the other communication terminal device The identification code is received.

  Further, the group communication program executable by the computer of the present invention includes an identification code generation step for generating an identification code of the communication terminal device, a participation request signal for requesting participation in group communication, and the communication terminal A transmission step of transmitting the identification code of the device, a reception step of receiving the participation request signal and the identification code of the other communication terminal device, and a storage step of storing the received identification code of the other communication terminal device, In the transmission step, when requesting participation in the group communication from another communication terminal device, the participation request signal and the identification code of the communication terminal device are transmitted, and the participation request signal from the other communication terminal device is received by the receiving means. When received, the identification code of the communication terminal device is transmitted, and in the reception step, a participation request signal is transmitted by the transmission means. In response to this, when an identification code of another communication terminal apparatus is received and a request to participate in group communication is requested from another communication terminal apparatus, a participation request signal from the other communication terminal apparatus and the other communication The terminal device identification code is received.

  According to the communication terminal apparatus of the present invention, the participation request signal and the identification code of the communication terminal apparatus are transmitted by the transmission means, and the participation response signal and the identification code of the other communication terminal apparatus are transmitted in response to the transmission. When it comes, the participation response signal and the identification code of the other communication terminal apparatus are received by the receiving means, and the received identification code of the other communication terminal apparatus is stored in the storage means.

  Further, according to the communication terminal device of the present invention, the participation request signal and the identification code of the other communication terminal device are received by the receiving means, and in response to the reception, the participation response signal and the identification code of the communication terminal device are received. The identification code of the other communication terminal device transmitted and received by the transmission means is stored in the storage means.

  Therefore, when the participation request signal and the identification code of the arbitrary communication terminal device are transmitted from an arbitrary communication terminal device, the participation response signal and the communication signal from the other communication terminal devices in the communication area of the arbitrary communication terminal device are transmitted. The identification code of each other communication terminal device is returned, and the identification code of each other communication terminal device is received by any communication terminal device and stored in the storage means. By using the identification code of each other communication terminal device in this storage means, group communication between any communication terminal device and each other communication terminal device becomes possible.

  In addition, the transmission of the participation request signal and the identification code of an arbitrary communication terminal device, and the reply of the participation response signal and the identification code of each other communication terminal device are performed again. By rewriting the identification code, the group can be reset and high mobility can be provided.

  Further, since the identification code of the communication terminal device is generated without using a telephone number, E-MAIL address, etc., it is possible to prevent leakage of personal information.

  Furthermore, since at least one of the participation request signal, the participation response signal, and the identification code of the communication terminal device is encrypted and transmitted / received, each communication terminal device participating in group communication is restricted or group communication is performed. Interference and wiretapping can be prevented.

  Further, when the identification code in the storage means is not received again within a predetermined time, the identification code is deleted from the storage means, so that, for example, another communication terminal device indicated by the identification code in the storage means can perform any communication. When the terminal device moves out of the communication area and communication between any communication terminal device and another communication terminal device becomes impossible, the identification code of the other communication terminal device is deleted from the storage means. Therefore, the other communication terminal device is excluded from group communication.

  In addition, by sending and receiving the identification code and responding to participation in the group communication, it is not necessary to separately define a participation response signal that responds to the participation request signal, thereby simplifying communication regulations.

  On the other hand, the present invention includes not only a communication terminal device but also a group communication program that can be executed by a computer.

  This program is recorded on a recording medium such as a magnetic disk, an optical disk, or a hard disk built in a computer, or transmitted and received through a communication network. A computer or the like can implement the present invention by reading a program from a recording medium, receiving the program through a communication network, and executing the program. In a system composed of a plurality of computers and the Internet, a plurality of processes can be distributed to a plurality of terminals. Therefore, the program can be applied not only to a single terminal such as a computer but also to a system.

  Examples of the recording medium include semiconductor storage elements such as mask ROM, EPROM, EEPROM, and flash ROM, IC cards, hard disks, floppy disks, optical disks such as MO, CD, MD, and DVD, magnetic tapes, and the like. Other types of recording media may be used as long as they can be recorded.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is a block diagram showing a first embodiment of a communication terminal apparatus according to the present invention. The communication terminal device 1 of the present embodiment performs wireless communication such as radio wave communication and infrared communication, and can perform data communication with many other communication terminal devices 1 having the same configuration.

  The communication terminal device 1 includes a wireless communication unit 11 for performing data communication with each other communication terminal device 1, a time measuring unit 12 for measuring a preset time and current time, a keyboard, a mouse, and the like. An input unit 13, a display unit 14 for displaying various messages and data, a storage unit 15 for storing various data and programs, and a control unit 16 for comprehensively controlling the communication terminal device 1. I have.

  The storage unit 15 includes a self-storage area 151 that stores a self-identification code indicating the communication terminal apparatus 1, a member storage area 152 that stores each member identification code indicating each other communication terminal apparatus 1, and data encryption An encryption / decryption key storage area 153 for storing encryption / decryption keys used for encryption and decryption, and a message file storage area 154 for storing messages, files, and the like. The storage unit 15 includes a known RAM, ROM, hard disk, and the like.

  The control unit 16 includes a network construction unit 161 that controls data communication performed with many other communication terminal devices 1. The control unit 16 and the network construction unit 161 perform various functions by loading a program from the storage unit 15 (ROM or hard disk) into the RAM and executing the program.

  In the communication terminal device 1 having such a configuration, as shown in FIG. 2, a participation request packet is transmitted between each of the other communication terminal devices 1-1 to 1-5 in the communication area 21 of the communication terminal device 1. By sending / receiving REQUEST, participation response packet REPLY, withdrawal notification packet DELETE, and identification code packet ID, a group communication member centered on the communication terminal device 1 is set to perform group communication or from group communication. The withdrawal of.

  Here, the participation request packet REQUEST is transmitted from the communication terminal device 1 which is the center of the group communication and received by the other communication terminal devices 1-1 to 1-5, and performs this group communication. This is for confirming the existence of other communication terminal devices 1-1 to 1-5 to be obtained and requesting the other communication terminal devices 1-1 to 1-5 to become members of this group communication. .

  The participation response packet REPLY is transmitted from one of the other communication terminal devices 1-1 to 1-5 that participates in the group communication, and is received by the communication terminal device 1 that is the center of the group communication. , For instructing to become a member of this group communication.

  The withdrawal notification packet DELETE is transmitted from the communication terminal device 1 and received by each of the other communication terminal devices 1-1 to 1-5 to instruct the communication terminal device 1 to leave the group communication. Including the self-identification code of the communication terminal device 1.

  The identification code packet ID is transmitted and received between the communication terminal device 1 and each of the other communication terminal devices 1-1 to 1-5, and includes a self-identification code and a member name of the communication terminal device. The signal format of the identification code packet ID is determined as a communication rule (protocol). For example, a self-identification code and a member name are added to a packet name character string.

  The meanings of the participation request packet REQUEST, participation response packet REPLY, withdrawal notification packet DELETE, and identification code packet ID are summarized in Table 1 below.

尚、他の各通信端末装置１-1〜１-5においても、通信端末装置１と同様に、参加要求パケットREQUEST、参加応答パケットREPLY、脱退通知パケットDELETE、及び識別コードパケットIDを送受して、自己の通信端末装置を中心とするグループ通信のメンバーを設定し、グループ通信を行なったり、グループ通信から脱退することができる。例えば、通信端末装置１-4においては、図２に示す様に当該通信端末装置１-4の通信エリア２２内の他の各通信端末装置１及び１-5との間で、参加要求パケットREQUEST、参加応答パケットREPLY、脱退通知パケットDELETE、及び識別コードパケットIDを送受することにより、当該通信端末装置１-4を中心とするグループ通信のメンバーを設定して、グループ通信を行なったり、グループ通信からの脱退を行なう。

In the other communication terminal apparatuses 1-1 to 1-5, as with the communication terminal apparatus 1, the participation request packet REQUEST, the participation response packet REPLY, the withdrawal notification packet DELETE, and the identification code packet ID are transmitted and received. It is possible to set a group communication member centering on its own communication terminal device, perform group communication, or leave the group communication. For example, in the communication terminal device 1-4, as shown in FIG. 2, the participation request packet REQUEST is exchanged with the other communication terminal devices 1 and 1-5 in the communication area 22 of the communication terminal device 1-4. By sending / receiving the participation response packet REPLY, the withdrawal notification packet DELETE, and the identification code packet ID, a group communication member centering on the communication terminal device 1-4 is set to perform group communication or group communication. Withdraw from.

  Next, according to the flowchart of FIG.3 and FIG.4, the process sequence until it sets the member of group communication centering on the communication terminal device 1 is demonstrated. Note that the processing of the flowcharts of FIGS. 3 and 4 is performed in both the communication terminal device 1 and the other communication terminal devices 1-1 to 1-5.

  First, when the communication terminal device 1 is powered on, the network construction unit 161 of the control unit 16 is activated, and the processing of the flowchart of FIG. 3 is started.

  When the network construction unit 161 is activated by turning on the power, it generates a self-identification code indicating the communication terminal device 1 at random, and stores the self-identification code in the self-storage area 151 of the storage unit 151 (step S101). ). This random self-identification code generation method may be a known method, for example, a method of setting based on a function having time as a variable.

  Also, instead of automatically generating a self-identification code at random, the display unit 14 displays a message prompting the user to input a self-identification code, and the value input by the operation of the input unit 13 according to this display is used as the self-identification code. It may be handled and stored in the self-storage area 151.

  Note that if the preset global ID of the communication terminal device 1 is used as the self-identification code, step S101 is omitted. Global IDs include telephone numbers and E-MAIL addresses. However, it is not preferable to use a global ID because personal information leaks easily.

  Even if a global ID is not used, it is not preferable to always use the same identification code. Therefore, in this embodiment, when the network construction unit 161 is activated by turning on the power, or when the group communication is resumed after leaving the group communication member, that is, the processing of the flowchart of FIG. At each start, the identification code generation step S101 is executed to regenerate the identification code.

  Subsequently, the network construction unit 161 controls the wireless communication unit 11 to transmit a participation request packet REQUEST through the wireless communication unit 11 (step S102). Thereby, the participation request packet REQUEST is transmitted to other unspecified other communication terminal devices 1-1 to 1-5 in the communication area of the communication terminal device 1.

  Thereafter, the network construction unit 161 activates the time measuring unit 12 and starts measuring a preset standby time by the time measuring unit 12. Further, the network construction unit 161 waits until the wireless communication unit 11 receives a participation request packet REQUEST or a participation response packet REPLY from another communication terminal device until the standby time elapses (in step S103). “No”, “No” in step S104, “No” in step S105).

  For example, when the standby time elapses without receiving any participation request packet REQUEST or participation response packet REPLY from another communication terminal device (“Yes” in step S103), the network construction unit 161 returns to step S102. The participation request packet REQUEST is transmitted again. Therefore, the participation request packet REQUEST is repeatedly transmitted until the participation request packet REQUEST or the participation response packet REPLY from another communication terminal apparatus is received.

  Further, when the participation request packet REQUEST from another communication terminal device is received by the wireless communication unit 11 (“Yes” in step S104), it becomes a member of another group communication centered on the other communication terminal device. Therefore, the network construction unit 161 transmits the participation response packet REPLY to the other unspecified communication terminal devices 1-1 to 1-5 through the wireless communication unit 11 (step S106). As a result, the communication terminal apparatus 1 instructs the other communication terminal apparatus to become a member of another group communication centered on the other communication terminal apparatus. Thereafter, the process proceeds to the process of the flowchart of FIG.

  Further, when the participation response packet REPLY from another communication terminal apparatus is received by the wireless communication unit 11 (“Yes” in step S105), the group communication centered on the communication terminal apparatus 1 by the other communication terminal apparatus. It was instructed to become a member of. Thereafter, the process proceeds to the process of the flowchart of FIG.

  Further, if the received packet is neither the participation request packet REQUEST nor the participation response packet REPLY (“No” in step S104, “No” in step S105), the process returns to step S103.

  Therefore, in the communication terminal device 1, the participation request packet REQUEST is transmitted and the participation response packet REPLY is received from another communication terminal device, or the participation request packet REQUEST is received from another communication terminal device. When the participation response packet REPLY is transmitted, the process proceeds to the flowchart of FIG.

  In the flowchart of FIG. 4, first, the network construction unit 161 confirms whether or not an interrupt key (not shown) of the input unit 13 has been operated (step S201). This interruption key is used to instruct withdrawal from group communication. For this reason, for example, when the interruption key is operated (“Yes” in step S201), the network construction unit 161 transmits the withdrawal notification packet DELETE including the self-identification code of the communication terminal device 1 through the wireless communication unit 11. (Step S202), the self-storage area 151 and the member storage area 152 of the storage unit 15 are initialized, the self-identification code and the member identification code are deleted, or the list of member identification codes is displayed on the display unit 14. For example, this list is deleted (step S203). As a result, the group communication centering on the communication terminal device 1 and the group communication centering on another communication terminal device are withdrawn, and group communication becomes impossible.

  Then, it waits until a restart key (not shown) of the input unit 13 is operated (“No” in step S204), and only when the restart key is operated (“Yes” in step S204), as shown in FIG. Return to step S101.

  If the interrupt key is not operated (“No” in step S201), the network construction unit 161 reads the self-identification code from the self-storage area 151 of the storage unit 15, and the self-identification code and the communication terminal device 1 The identification code packet ID including the member name is generated, and this identification code packet ID is transmitted to other unspecified communication terminal apparatuses 1-1 to 1-5 through the wireless communication unit 11 (step S205).

  Thereafter, the network construction unit 161 waits for the wireless communication unit 11 to receive the identification code packet ID including the self-identification code and member name of another communication terminal device (step S206).

  Here, since both the communication terminal device 1 and each of the other communication terminal devices 1-1 to 1-5 perform the processing of the flowcharts of FIGS. 3 and 4, the participation request packet REQUEST and the participation response packet REPLY are displayed. If it is sent and received (steps S102, S104, S105), unless it leaves the group communication (“No” in step S201), an identification code packet ID including a self-identification code and a member name is transmitted (step S205), and An identification code packet ID including the self-identification code and member name of another communication terminal apparatus is received (“Yes” in step S206).

  Therefore, also in the communication terminal device 1, the wireless communication unit 11 receives the identification code packet ID including the self-identification code and member name of another communication terminal device (“Yes” in step S206). When the identification code packet ID is received, the network construction unit 161 stores the self-identification code of another communication terminal device included in the identification code packet ID as the member identification code in the member storage area 152 of the storage unit 15. It is determined whether or not (step S207). For example, if the self-identification code of the other communication terminal device is not stored as the member identification code (“No” in step S207), the network construction unit 161 uses the self-identification code of the other communication terminal device as the member identification code. The member is stored in the member storage area 152 (step S208), and the member name of another communication terminal device included in the identification code packet ID and the current time measured by the time measuring unit 12 are associated with the member identification code and stored in the member. The data is stored in the area 152 (step S209). Then, the network construction unit 161 displays a list of member identification codes and member names in the member storage area 152 on the display unit 14 (step S210). Thereafter, the process returns to step S201.

  If the self-identification code of another communication terminal device has already been stored as the member identification code (“Yes” in step S207), the network construction unit 161 sets the time stored in association with the member identification code. The time is updated to the current time measured by the time measuring unit 12 (step S211). Thereafter, the process returns to step S201.

  Since there are other communication terminal devices 1-1 to 1-5 in the communication area of the communication terminal device 1, the processes of steps S206 to S211 are repeated, and each of the other communication terminal devices 1-1. ˜1-5, the member identification code, member name, and time are stored in the member storage area 152, and a list of member identification codes and member names is displayed on the display unit 14. Alternatively, the time corresponding to the already stored member identification code is updated to the current time for each of the other communication terminal devices 1-1 to 1-5.

  FIG. 5 illustrates the member identification code, member name, and time in the member storage area 152.

  In this way, a group centering on the communication terminal device 1 is set, and group communication is performed with the member identification code and the list of member names displayed on the display unit 14.

  In this group communication, the member identification code is selected by the operation of the input unit 13, and the transmission of the message in the message file storage area 154 is instructed. In response to this, the network construction unit 161 reads the instructed message from the message file storage area 154, includes this message and the self-identification code of the communication terminal device 1, and uses the selected member identification code as the destination. A packet to be transmitted is generated, and this packet is transmitted through the wireless communication unit 11. Upon receiving this packet, each of the other communication terminal devices determines whether or not the destination member identification code included in this packet matches the self-identification code. If they match, the message included in this packet is displayed. If it does not match, the packet is discarded.

  Further, by operating the input unit 13, a plurality of member identification codes may be selected and a message transmission may be instructed. In this case, the network construction unit 161 generates a packet including the instructed message and the self-identification code of the communication terminal device 1 and destined for each selected member identification code, and transmits this packet. When each of the other communication terminal devices receives this packet, if any of the member identification codes of the destination included in this packet matches the self-identification code, the message included in this packet is displayed or stored. If they do not match, the packet is discarded.

  Further, each of the other communication terminal devices generates a reply packet addressed to the self-identification code of the communication terminal device 1 included in the received packet, and transmits the reply packet. Can be returned to the communication terminal device 1.

  In this way, the communication terminal device 1 and each other communication terminal device send and receive the participation request packet REQUEST, the participation response packet REPLY, and the identification code packet ID by broadcast, and the group centering on the communication terminal device 1 After that, the packet is transmitted / received by multicast between the communication terminal device 1 and each of the other communication terminal devices to perform group communication.

  On the other hand, during group communication, the identification code packet ID from another communication terminal apparatus may not be received by the wireless communication unit 11 (“No” in step S206). In this case, the network construction unit 161 confirms whether or not the participation request packet REQUEST has been received by the wireless communication unit 11 (step S212). If it has been received (“Yes” in step S212), the participation response packet REPLY Is transmitted to another unspecified communication terminal device (step S213), and the communication terminal device 1 becomes a member of another group communication centering on the other communication terminal device. To instruct.

  If the participation request packet REQUEST is not received (“No” in step S212), the network construction unit 161 determines whether or not the withdrawal notification packet DELETE is received (step S214), and the withdrawal notification packet DELETE is received. If so ("Yes" in step S214), the process jumps to step S215 and proceeds to step S216.

  If the withdrawal notification packet DELETE has not been received (“No” in step S214), the network construction unit 161 stores in the member storage area 152 for each time corresponding to each member identification code in the member storage area 152. The time difference between the current time and the current time measured by the time measuring unit 12 is obtained, and whether or not this difference exceeds a predetermined time, that is, the member identification code in the member storage area 152 is received. Then, it is determined whether or not a predetermined time has elapsed since the time corresponding to the member identification code was stored or updated (step S215). Then, the network construction unit 161 returns to the process of step S201 if the predetermined time has not elapsed for any of the times corresponding to the member identification codes (“No” in step S215).

  If a withdrawal notification packet DELETE has been received (“Yes” in step S214), or if a certain time has passed for at least one of the times corresponding to each member identification code (“Yes” in step S215). )), The network construction unit 161 deletes the identification code included in the withdrawal notification packet DELETE or the identification code after a certain period of time from the member storage area 152, and the time and member name corresponding to the identification code are stored in the member storage area. It erases from 152 (step S216), and the member storage area 152 is updated (step S217).

  Here, as described above, in each of steps S201 to S203, in response to the operation of the interruption key, the withdrawal notification packet DELETE including the self-identification code of the communication terminal device 1 is transmitted, and then the self-storage area. 151 and the member storage area 152 are initialized, and the self-identification code and the member identification code are erased. This is similarly performed in each of the other communication terminal devices. Accordingly, any communication terminal apparatus receives the withdrawal notification packet DELETE including the self-identification code of the other communication terminal apparatus that has withdrawn from the group communication (step S214), and the identification code included in the withdrawal notification packet DELETE. Can be deleted from the member storage area 152 (step S217), and the other communication terminal apparatus can be withdrawn from the group communication.

  Further, as described above, the processes of steps S206 to S211 are repeated, and the time corresponding to the already stored member identification code is updated to the current time. For this reason, for example, if another communication terminal apparatus moves outside the communication area of the communication terminal apparatus 1 during group communication, and communication between the communication terminal apparatus 1 and the other communication terminal apparatus becomes impossible. The time corresponding to the member identification code of another communication terminal device is not updated. As a result, the time difference between the time corresponding to the already stored member identification code and the current time exceeds a certain time (“Yes” in step S215), and the member identification codes of other communication terminal devices are stored as members. It is deleted from area 152 (step S217), and the member identification code of another communication terminal device is automatically excluded from the group communication target. In other words, the processes of steps S206 to S211 are repeated, and the time corresponding to the already stored member identification code is updated to the current time, so that the member identification code is excluded from group communication. Is prevented.

  In this embodiment, an interruption key and a resumption key are provided, but withdrawal or resumption from group communication may be instructed by other methods. For example, when it is realized as application software of a window system, the processing of the flowchart of FIG. 3 is executed or restarted by “execution of application software” to restart group communication, and “application software main window closing operation” To withdraw from group communication.

  Further, the identification code packet ID may be given the role of the participation response packet REPLY. In this case, in step S105 in FIG. 3, the reception of the identification code packet ID is confirmed instead of the reception of the participation response packet REPLY. Then, step S106 and step S213 in FIG. 4 are deleted, or in order to immediately respond to the reception of the participation request packet REQUEST in step S104 and step S212, its own identification code packet ID is transmitted in step S106 and step S213. To do.

  FIG. 6 is a flowchart showing the second embodiment of the present invention. In this embodiment, although the communication apparatus 1 of FIG. 1 is used, the processing of the flowchart of FIG. 6 is executed instead of the processing of the flowchart of FIG. 3, and the processing of the flowchart of FIG. Execute.

  In the process of the flowchart of FIG. 6, when a participation request packet REQUEST and a participation response packet REPLY are transmitted and received, these packets are encrypted and decrypted. Thereby, the member of group communication can be restricted.

  The participation request packet REQUEST and the participation response packet REPLY are assigned an encryption flag indicating the presence or absence of encryption. For example, if the packet is not encrypted, the encryption flag “0” is assigned to the packet, and if the packet is encrypted, the encryption flag “1” is assigned to the packet.

  The meaning of the value of the encryption flag is shown in Table 2 below.

さて、本実施例においても、通信端末装置１の電源が投入されると、制御部１６のネットワーク構築部１６１が起動され、図６のフローチャートの処理が開始される。

Also in the present embodiment, when the communication terminal device 1 is powered on, the network construction unit 161 of the control unit 16 is activated and the processing of the flowchart of FIG. 6 is started.

  When the network construction unit 161 is activated by turning on the power, it generates a self-identification code indicating the communication terminal device 1 at random, and stores this self-identification code in the self-storage area 151 of the storage unit 151 (step S301). ).

  Subsequently, the network construction unit 161 encrypts the participation request packet REQUEST using the encryption / decryption key in the encryption / decryption key storage area 153 (step S302), and the encrypted participation request packet REQUEST has an encryption flag “ After adding 1 ″, the encrypted participation request packet REQUEST is transmitted to the unspecified other communication terminal devices 1-1 to 1-5 through the wireless communication unit 11 (step S303).

  Thereafter, the network construction unit 161 activates the time measuring unit 12 and starts measuring a preset standby time by the time measuring unit 12. Then, the network construction unit 161 waits until the wireless communication unit 11 receives a packet from another communication terminal device until the standby time elapses (“No” in step S304, “No” in step S305). No ").

  For example, when the standby time elapses without receiving a packet from another communication terminal device (“Yes” in step S304), the network construction unit 161 returns to step S302.

  When a packet from another communication terminal apparatus is received by the wireless communication unit 11, the network construction unit 161 checks whether or not the encryption flag given to the packet is “1” (step S305) If the encryption flag is “0” or the encryption flag is not added to the packet (“No” in step S305), the packet is discarded and the process returns to step S304 to return to the next packet. Wait for reception.

  If the encryption flag assigned to the packet is “1” (“Yes” in step S305), the network construction unit 161 indicates that the packet is encrypted. The packet is decrypted using the encryption / decryption key in 153 (step S306). Thereby, a participation request packet REQUEST or a participation response packet REPLY from another communication terminal device is obtained.

  When a participation request packet REQUEST is obtained from another communication terminal device (“Yes” in step S307), it is requested to become a member of another group communication centered on the other communication terminal device. Therefore, the network construction unit 161 encrypts the participation response packet REPLY using the encryption / decryption key in the encryption / decryption key storage area 153 (step S308), and the encrypted flag “1” is added to the encrypted participation response packet REPLY. "Is added, and then the encrypted participation response packet REPLY is transmitted to another unspecified communication terminal device through the wireless communication unit 11 (step S309). Thereafter, the process proceeds to the process of the flowchart of FIG.

  When a participation response packet REPLY is obtained from another communication terminal device (“Yes” in step S310), the other communication terminal device becomes a member of group communication centered on the communication terminal device 1. Is instructed. Thereafter, the process proceeds to the process of the flowchart of FIG.

  Further, if the received packet is neither the participation request packet REQUEST nor the participation response packet REPLY (“No” in step S307, “No” in step S310), the process returns to step S304.

  Accordingly, the participation request packet REQUEST is transmitted and the participation response packet REPLY from another communication terminal device is received, or the participation request packet REQUEST from another communication terminal device is received and the participation response packet REPLY is received. When transmitted, the process of the flowchart of FIG. 4 is started.

  Thus, when sending and receiving the participation request packet REQUEST and the participation response packet REPLY, when encrypting and decrypting these packets, the encryption / decryption key is required. Limited.

  In each of steps S212, S213, and S214 in FIG. 4, a participation request packet REQUEST or a participation response packet REPLY is transmitted and received. For this reason, it is necessary to replace each step S212, S213, and S214 with each step S305 to S310.

  In this embodiment, the encryption composite key is used for encryption and decryption. However, the encryption key and composite key may be different as in the public key method. Alternatively, other known encryption methods can be applied.

It is a block diagram which shows the Example of the communication terminal device of this invention. It is a figure which illustrates the communication network formed by the some communication terminal device of FIG. It is a flowchart which shows the process by the communication terminal device of FIG. It is a flowchart which shows the process following FIG. It is a figure which illustrates the data structure in the member storage area in the communication terminal device of FIG. It is a flowchart which shows Example 2 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Communication terminal device 12 Time measuring part 13 Input part 14 Display part 15 Storage part 16 Control part 151 Self storage area 152 Member storage area 153 Encryption / decryption key storage area 154 Message file storage area 161 Network construction part

Claims (9)

In a communication terminal device that performs group communication between a plurality of communication terminal devices,
A transmission means for transmitting a participation request signal for requesting another communication terminal device to participate in group communication and an identification code of the communication terminal device;
Receiving means for receiving a participation response signal indicating participation in group communication and an identification code of another communication terminal device;
Storage means for storing an identification code of another received communication terminal apparatus. In a communication terminal device that performs group communication between a plurality of communication terminal devices,
Receiving means for receiving a participation request signal for requesting participation in group communication and an identification code of another communication terminal device;
In response to receiving the participation request signal, a transmission means for transmitting a participation response signal indicating participation in group communication and an identification code of the communication terminal device;
Storage means for storing an identification code of another received communication terminal apparatus. In a communication terminal device that performs group communication between a plurality of communication terminal devices,
A transmission means for transmitting a participation request signal for requesting participation in group communication, a participation response signal indicating participation in group communication, and an identification code of the communication terminal device;
Receiving means for receiving a participation request signal, a participation response signal, and an identification code of another communication terminal device;
Storage means for storing the received identification code of another communication terminal device,
The transmission means is
When requesting other communication terminal devices to participate in group communication, send a participation request signal and an identification code of the communication terminal device,
When a participation request signal from another communication terminal device is received by the receiving means, a participation response signal indicating participation in group communication and an identification code of the communication terminal device are transmitted,
The receiving means is
As a response to the participation request signal being transmitted by the transmission means, the participation response signal and the identification code of another communication terminal device are received,
A communication terminal apparatus that receives a participation request signal from another communication terminal apparatus and an identification code of the other communication terminal apparatus when a request for participation in group communication is requested from the other communication terminal apparatus.   The communication terminal apparatus according to claim 1, further comprising an identification code generation unit configured to generate an identification code of the communication terminal apparatus.   4. The communication terminal apparatus according to claim 1, wherein at least one of a participation request signal, a participation response signal, and an identification code of the communication terminal apparatus is encrypted and transmitted / received.   The transmission means transmits the participation request signal or the participation response signal, the reception means receives the participation request signal or the participation response signal, and the storage means repeatedly stores the identification code of the other communication terminal device. The communication terminal device according to any one of 1 to 3.   When the identification code of another communication terminal apparatus is received by the receiving means and stored in the storage means, and the identification code is not received again by the receiving means until a predetermined time elapses, the identification code is read from the storage means. 4. The communication terminal device according to claim 1, wherein the communication terminal device is deleted. In a communication terminal device that performs group communication between a plurality of communication terminal devices,
Identification code generating means for generating an identification code of the communication terminal device;
A transmission means for transmitting a participation request signal for requesting participation in group communication, and an identification code of the communication terminal device;
Receiving means for receiving a participation request signal and an identification code of another communication terminal device;
Storage means for storing the received identification code of another communication terminal device,
The transmission means is
When requesting other communication terminal devices to participate in group communication, send a participation request signal and an identification code of the communication terminal device,
When a participation request signal from another communication terminal device is received by the receiving means, the identification code of the communication terminal device is transmitted,
The receiving means is
In response to the participation request signal being transmitted by the transmission means, the identification code of another communication terminal device is received,
A communication terminal apparatus that receives a participation request signal from another communication terminal apparatus and an identification code of the other communication terminal apparatus when a request for participation in group communication is requested from the other communication terminal apparatus. An identification code generating step for generating an identification code of the communication terminal device;
A transmission step of transmitting a participation request signal for requesting participation in group communication, and an identification code of the communication terminal device;
A reception step of receiving a participation request signal and an identification code of another communication terminal device;
A storage step of storing the received identification code of the other communication terminal device,
In the send step,
When requesting other communication terminal devices to participate in group communication, send a participation request signal and an identification code of the communication terminal device,
When a participation request signal from another communication terminal device is received by the receiving means, the identification code of the communication terminal device is transmitted,
In the receive step,
In response to the participation request signal being transmitted by the transmission means, the identification code of another communication terminal device is received,
When a request for participation in group communication is requested from another communication terminal device, a participation request signal from the other communication terminal device and an identification code of the other communication terminal device are received. Program for group communication.

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