JP6248578B2 - Communication terminal system, communication terminal, communication control method, and communication terminal control program - Google Patents

Description

  The present invention relates to a communication terminal system, a communication terminal, a communication control method, and a communication terminal control program that can find a communication terminal closest to a predetermined target point.

  Wireless communication systems such as mobile communication systems and wireless local area network (LAN) systems are classified into two types. The first is an infrastructure type wireless network in which a communication terminal performs wireless communication via a base station or an access point. The second is an ad hoc wireless network in which each communication terminal directly performs wireless communication between communication terminals without going through a base station or an access point.

  In an ad hoc wireless network, when a transmitting terminal communicates with a destination terminal to which radio waves from the transmitting terminal do not reach directly, communication is performed by relaying the relay terminal. The transmitting terminal in the first communication section is called a “source terminal”. The transmitting terminal after the next communication section is a relay terminal.

  Ad hoc wireless networks are attracting attention because they do not need to build an infrastructure such as an access point and can be used as a communication means when a wide area network such as a mobile phone network is destroyed due to a disaster or the like and cannot be used. For example, it may be required to collect information on a target point during a disaster. In such a case, it is required to specify position information of a target point for a group of communication terminals capable of constructing an ad hoc wireless network and find a communication terminal (destination terminal) closest to the target point.

  Patent Document 1 discloses a routing method in which, in an ad hoc wireless network, each node determines whether or not to exchange information with a peripheral node located within the wireless range of the own node.

  In the technique of Patent Document 1, identification information, position information, moving speed information, and wireless range information, which are node information, are exchanged between the own node and a peripheral node located within the wireless range of the own node. . In the technique of Patent Document 1, each node determines whether or not to further exchange node information with the peripheral node based on the node information acquired from the peripheral node.

  For example, it is confirmed whether or not the peripheral node B is moving relative to the self node A based on the movement speed information included in the node information of the peripheral node B already acquired by the self node A. When the own node A confirms that the peripheral node B has not moved relatively, it determines that the exchange of node information with the peripheral node B is unnecessary. The own node A stops exchanging node information with the peripheral node B based on the determination result.

  On the other hand, when the node A confirms that the peripheral node B is moving relatively, it determines that it is necessary to exchange node information with the peripheral node B. Then, the own node A exchanges node information with the peripheral node B based on the determination result.

  As described above, the technique of Patent Literature 1 determines whether or not the own node further exchanges node information with the neighboring node based on the node information of the neighboring node that the own node has already acquired. Then, the local node exchanges node information with neighboring nodes only when it is determined that the exchange of node information is necessary. Therefore, in the technique of Patent Document 1, since the exchange of node information is reduced, the communication traffic of the entire network is reduced.

  Patent Document 2 discloses a method for determining the data transfer area based on the position of the destination node from the transmission node and distributing the data in the ad hoc wireless network.

  In the technique of Patent Document 2, the transmission node transmits data to the destination node to the first adjacent node group adjacent to the transmission node. Each adjacent node in the first adjacent node group determines a first transfer area for transferring data to the destination node based on the position of the transmission node and the position of the destination node. Each adjacent node determines whether or not its own node is located within the determined first transfer area. If each adjacent node determines that the own node is located within the determined first transfer area, each adjacent node transmits the received data to the destination node to the second adjacent node adjacent to the own node.

  If each adjacent node of the first adjacent node group determines that the own node is not located within the determined first transfer area, the received data to the destination node is transferred to the second adjacent node adjacent to the own node. Do not send. If the destination node is located within the determined first transfer area, the destination node has received data from the transmission node to the destination node transmitted from the transmission node.

  As described above, in the technique of Patent Document 2, data from the transmission node to the destination node is transferred via the nodes located in the sequentially determined transfer area and delivered to the destination node.

  At this time, in the technique of Patent Document 2, each adjacent node that is determined that the own node is located outside the sequentially determined transfer area does not transmit the received data to the destination node to the adjacent node of the own node.

  As described above, in the technique of Patent Document 2, an adjacent node that has received data from a destination node to a destination node determines a transfer area, and determines whether or not the own node is located in the determined transfer area. To do. Then, in order to transmit the data to the destination node received only by the adjacent node determined that the own node is located in the transfer area to the adjacent node adjacent to the own node, the technique of Patent Document 2 Communication traffic is reduced.

JP 2004-032559 A (No. 5-10, FIG. 2-4) JP 2010-288276 A (pages 21-27, FIGS. 3 and 4)

  In the technique of Patent Document 1, each node determines whether or not to further exchange node information with its peripheral node based on node information already obtained by exchanging with the peripheral node. Then, according to the determination result, each node exchanges node information with surrounding nodes. Therefore, the technology of Patent Document 1 reduces the communication traffic of the entire network. However, in the technique of Patent Document 1, it is assumed that each node included in the network acquires node information by exchanging node information with a peripheral node located in the communication area of the own node.

  Therefore, in the technique of Patent Document 1, in order to discover and communicate with the node closest to the target point, all nodes included in the network must exchange node information with the peripheral nodes in each communication area. There is a problem that must be.

  In the technique of Patent Document 2, it is assumed that the transmission node acquires the position information of the destination node when distributing data to the destination node. That is, in the technique of Patent Document 2, the transmission node needs to acquire in advance the position information of all nodes in the network in order to make the node closest to the target point the destination node. In the technique of Patent Document 2, it is necessary to find the node closest to the target point based on the position information of all the nodes acquired in advance and specify the found node as the destination node. That is, the technique of Patent Document 2 has a problem that node information including position information of the node closest to the target point must be acquired in advance in order to find the node closest to the target point. .

  An object of the present invention is to provide a communication terminal system, a communication terminal, a communication control method, and a communication terminal control program capable of finding a communication terminal closest to a predetermined target point. .

  The communication terminal system according to the present invention includes a first positioning unit that acquires first terminal position information that is its own terminal position information, target position information that designates a predetermined target point, first terminal position information, and itself. The first search transmission means for transmitting the first search signal including the identification information and the second terminal position information which is the terminal position information on the reception side of the first search signal is performed on the reception side As a result of the first perspective determination as to which of the transmission side and reception side of the first search signal is closer to the target point, the first search transmitted from the reception side when the reception side is closer to the target point than the transmission side A first search response receiving means for receiving a response signal; and a receiving side closest to the target point when receiving the first search response signal within a predetermined time after transmitting the first search signal. And the first search response signal is received within a predetermined time. If not, the first communication terminal provided with the first terminal control means for determining that it is the target communication terminal, the second positioning means for acquiring the second terminal position information, and the first as the receiving side First search reception means for receiving a search signal, first search response transmission means for transmitting a first search response signal as a reception side, and first perspective determination based on the first search signal as a reception side And a second communication terminal comprising second terminal control means for transmitting a first search response signal according to the result of the first perspective determination.

  The communication terminal of the present invention includes positioning means for acquiring first terminal position information that is its own terminal position information, target position information for designating a predetermined target point, first terminal position information, and its own identification information. The search transmission means for transmitting the search signal including the search signal, and the search signal transmission side or the reception side performed on the reception side based on the second terminal position information that is the terminal position information on the reception side of the search signal is the target. Search response receiving means for receiving a search response signal transmitted from the receiving side when the receiving side is closer to the target point than the transmitting side as a result of the near / close determination as to whether it is close to the point, and within a predetermined time after transmitting the search signal A terminal control unit that determines that the receiving side closest to the target point is the target communication terminal when receiving the search response signal, and determines that the receiving side is the target communication terminal when the search response signal is not received within a predetermined time. To prepare And butterflies.

  The communication control method of the present invention acquires first terminal position information that is its own terminal position information, and includes a target position information that designates a predetermined target point, first terminal position information, and its own identification information. Transmission / reception of the search signal is performed on the receiving side based on the second terminal position information which is the terminal position information on the receiving side of the search signal, which is closer to the target point. As a result of determination, when the receiving side is closer to the target point than the transmitting side, the search response signal transmitted from the receiving side is received, and when the search response signal is received within a predetermined time after transmitting the search signal, the target point is the most. The receiving side close to is determined as the target communication terminal, and when the search response signal is not received within a predetermined time, it is determined that itself is the target communication terminal.

  The communication terminal control program according to the present invention includes positioning means for acquiring first terminal position information, which is its own terminal position information, target position information for specifying a predetermined target point, first terminal position information, and identification of itself. Search transmission means for transmitting a search signal including information and any one of the transmission side and the reception side of the search signal performed on the reception side based on the second terminal position information which is the terminal position information on the reception side of the search signal As a result of determining whether or not the target point is close to the target point, a communication terminal computer including search response receiving means for receiving a search response signal transmitted from the receiving side when the receiving side is closer to the target point than the transmitting side When the search response signal is received within a predetermined time after transmission, the receiving side closest to the target point is determined as the target communication terminal, and when the search response signal is not received within the predetermined time, And wherein the operating the terminal controller for determining that it is.

  According to the present invention, a communication terminal closest to a predetermined target point can be found.

It is a block diagram which shows the structural example of the communication terminal system of the 1st Embodiment of this invention. It is a block diagram which shows the structural example of the communication terminal of the 1st Embodiment of this invention. It is a block diagram which shows the minimum structure of the communication terminal system of the 1st Embodiment of this invention. It is a block diagram which shows the minimum structure a of the communication terminal of the 1st Embodiment of this invention. It is a block diagram which shows the minimum structure b of the communication terminal of the 1st Embodiment of this invention. It is a block diagram which shows the structural example of the communication terminal system of the 2nd Embodiment of this invention. It is a block diagram which shows the structural example of the communication terminal of the 2nd Embodiment of this invention. It is a sequence diagram which shows the operation example of the communication terminal system of the 2nd Embodiment of this invention. It is the first half of the flowchart which shows the operation example of the communication terminal of the 2nd Embodiment of this invention. It is a latter half part of the flowchart which shows the operation example of the communication terminal of the 2nd Embodiment of this invention. It is explanatory drawing of the first half which shows the operation example of the communication terminal of the 2nd Embodiment of this invention. It is explanatory drawing of the second half which shows the operation example of the communication terminal of the 2nd Embodiment of this invention. It is explanatory drawing which shows the operation example of the communication terminal of the 3rd Embodiment of this invention. It is explanatory drawing which shows the operation example of the communication terminal of the 4th Embodiment of this invention. It is a block diagram which shows the structural example of the communication terminal of the 5th Embodiment of this invention. It is a block diagram which shows the structural example of the communication terminal of the 6th Embodiment of this invention.

Embodiments of the present invention will be described below in detail with reference to the drawings.
(First embodiment)
A first embodiment of the present invention will be described. FIG. 1 is a block diagram illustrating a configuration example of a communication terminal system 100 according to the present embodiment. FIG. 2 is a block diagram illustrating a configuration example of the communication terminal 1 according to the present embodiment. The configuration of the communication terminal system 100 and the communication terminal 1 will be described with reference to FIGS.

  The communication terminal system 100 includes a communication terminal 1, a communication terminal 2, and an information processing device 3. The information processing device 3 communicates with the communication terminal 1. Communication terminal 1 and communication terminal 2 are in positions where they can communicate with each other.

  The communication terminal 1 includes a terminal control unit 10, a terminal communication unit 11, an apparatus communication unit 12 and a positioning unit 13. The terminal communication means 11 communicates with other communication terminals. The device communication unit 12 communicates with the communication terminal 1 and the information processing device 3. The positioning means 13 measures the current position of the communication terminal 1 and outputs the acquired position information to the terminal control means 10. The terminal control unit 10 communicates with the information processing device 3 using the device communication unit 11. Further, the terminal control unit 10 grasps the position of the terminal itself based on the position information from the positioning unit 13. And the terminal control means 10 communicates with the communication terminal 2 using the terminal communication means 12.

  The communication terminal 2 has the same configuration as the communication terminal 1 shown in FIG. However, the communication terminal 2 may not include the device communication unit 12. The same configurations as those in FIG. 2 are denoted by the same names and the same numbers, and description thereof is omitted.

  The operation of the communication terminal system 100 will be described with reference to FIGS. Here, the communication terminal 1 is referred to as a communication terminal A, and the communication terminal 2 is referred to as a communication terminal B.

  The information processing device 3 “unicasts” a communication device A with a “search request signal” for finding a communication device (hereinafter referred to as a destination terminal) closest to the target point T.

  “Unicast transmission” is to transmit a communication signal by designating a single transmission destination. Therefore, the search request signal unicast transmitted from the information processing device 3 includes “identification information” of the communication terminal A that is the transmission destination and position information T of the target point T.

  “Identification information” is unique information given in advance to each communication terminal in order to identify each communication terminal. For example, each communication terminal is assigned and stored with a unique number as identification information.

  The communication terminal A receives the search request signal from the information processing apparatus 3 and operates as a “source terminal”. The “source terminal” refers to a communication terminal that receives communication from the information processing apparatus 3 and performs initial communication with another communication terminal 1. The communication terminal A is a communication terminal that performs transmission in the first communication section.

  The communication terminal A receives the search request signal from the information processing device 3 and starts an operation for searching for the communication terminal closest to the target point T. Specifically, the terminal control means 10 of the communication terminal A includes the identification information A of the communication terminal A, the position information A of the communication terminal A acquired by the positioning means 13 of the communication terminal A, and the position information T of the target point T. Create a "search signal" containing Then, the terminal control unit 10 of the communication terminal A broadcasts a “search signal” to the communication terminal B using the terminal communication unit 11. Therefore, even when the transmission destination of the search signal by the communication terminal A exists other than the communication terminal B, the search signal is transmitted to all communication terminals of the transmission destination.

  The “search signal” is based on the distance from the communication terminal A that has transmitted the search signal to the target point T and the distance from the communication terminal B to the target point T with respect to the communication terminal B that has received the search request signal. , A signal for determining which of the communication terminal A and the communication terminal B is close to the target point T (hereinafter referred to as “distance determination”). The search signal is a signal for requesting a response based on the result of the perspective determination from the communication terminal B that has received the search signal. Therefore, the search signal includes the position information T of the target point T, the identification information A of the communication terminal A that has transmitted the search signal, and the position information A.

  “Broadcast transmission” refers to simultaneously transmitting communication signals having the same communication contents to an unspecified number of persons without specifying a transmission destination.

  The search signal transmitted from the communication terminal A is received by the communication terminal B. When receiving the search signal from the communication terminal A, the terminal control means 10 of the communication terminal B receives the position information A of the communication terminal A included in the search signal and the position information B of the communication terminal B acquired by the positioning means 13 of the communication terminal B. Based on the above, it is determined whether the communication terminal A or the communication terminal B is close to the target point T. If the terminal control means 10 of the communication terminal B determines that the terminal is closer to the target point T than the communication terminal A, it creates a “search response signal” including the identification information B of the communication terminal B and the position information B. Then, broadcast transmission is performed using the terminal communication means 11 of the communication terminal B.

  The “search response signal” is a signal transmitted by the communication terminal 1 that has received the search signal based on a result of the determination. The search response signal transmitted from the communication terminal B is received by the communication terminals 1 including the communication terminal A.

  On the other hand, if the terminal control means 10 of the communication terminal B determines that its own terminal is farther from the target point T than the communication terminal A, it stops creating and transmitting the search response signal described above.

  The terminal control means 10 of the communication terminal A waits for reception of the search response signal for a predetermined time after transmitting the search signal, and ends reception of the search response signal. The terminal control means 10 of the communication terminal A selects the communication terminal closest to the target point T from the communication terminals 1 that transmitted the search response signal received using the terminal communication means 11 within the predetermined time. Judged as the destination terminal. That is, the terminal control means 10 of the communication terminal A determines the destination terminal based on the position information of the communication terminal 1 included in the search response signal received within a predetermined time.

  In the communication terminal system 100, the communication terminal B is closer to the target point T than the communication terminal A. Accordingly, the terminal control means 10 of the communication terminal B creates and transmits a search response signal to the communication terminal A based on the above-described distance determination. The communication terminal A receives the search response signal from the communication terminal B. The terminal control means 10 of the communication terminal A waits for reception of the search response signal for a predetermined time after transmitting the search signal, and ends reception of the search response signal.

  At this time, the terminal control means 10 of the communication terminal A determines the communication terminal closest to the target point T based on the search response signal received within a predetermined time. In the communication terminal system 100, only the communication terminal B transmits the search response signal, so the communication terminal A determines the communication terminal B as the destination terminal.

  Note that the terminal control means 10 of the communication terminal A determines that the communication terminal A itself is the destination terminal if it does not receive the search response signal within a predetermined time.

  Thus, the communication terminal A completes the search for the destination terminal based on the above determination. Then, the terminal control means 10 of the communication terminal A creates a “search request response signal” and unicasts it to the information processing apparatus 3 using the apparatus communication means 12. The “search request response signal” is a signal that is responded to the search request signal received by the source terminal from the information processing device 3. The search request response signal notifies the information processing apparatus 3 that the communication terminal A has completed the search for the communication path to the communication terminal (destination terminal) closest to the target point T requested for the search by the search request signal. Signal.

  Note that the communication terminal A may create a “routing table” indicating a communication route to the communication terminal B that is the destination terminal.

  The “routing table” is a table in which a communication path from a source terminal to a destination terminal is indicated by identification information of each communication terminal. Here, since the communication terminal A is the source terminal and the communication terminal B is the destination terminal, the identification information indicating the source terminal and the destination terminal in the routing table includes the identification information A of the communication terminal A and the identification of the communication terminal B. Information B is posted.

  In this way, the communication terminal A transmits the search signal and receives the search request signal including the position information T of the target point T from the information processing device 3 as a trigger. Start the search. Then, the communication terminal A determines the destination terminal from among the communication terminals that transmitted the search response signal based on the search response signal received corresponding to the search signal within a predetermined time. Further, the communication terminal A determines that the communication terminal A itself is the destination terminal when the search response signal is not received within a predetermined time. Then, the communication terminal A notifies the information processing apparatus 3 that the search for the communication route to the communication terminal closest to the target point T has been completed with a search request response signal.

  Note that the communication terminal A need not previously acquire terminal information including position information of other communication terminals when searching for a destination terminal. Each communication terminal that receives the search signal from communication terminal A creates and transmits a search response signal based on the distance determination between communication terminal A and its own terminal. And the communication terminal A should just determine a destination terminal based on the search response signal received within the predetermined time.

  As described above, the communication terminal system 100 according to the present embodiment can find the communication terminal closest to the predetermined target point.

  In the present invention, the information processing apparatus 3 in the communication terminal system 100 described with reference to FIG. 1 is not essential. That is, the search request information including the position information T of the target point T has only to be specified to the communication terminal by an arbitrary method, and is necessarily transmitted from some external communication device such as the information processing device 3 to the communication terminal. There is no. Therefore, the device communication means 12 of the communication terminal 1 that is responsible for communication with the information processing device 3 is not essential.

  Further, in the terminal communication means 11 of the communication terminal 1 that is responsible for communication with other communication terminals, a search transmission function for transmitting a search signal and a search response reception function for receiving a search response signal responded based on the search signal Is an essential function. In addition, a search signal output function that creates a search signal based on the search request information and outputs the search signal to the search transmission function, and a search response signal that is input from the search response reception function, A destination determination function for determining a nearby communication terminal is also essential.

  In the terminal communication means 11 of the communication terminal 2 that has received the search signal, the search reception function for receiving the search signal and the search response transmission function for transmitting the search response signal that is responded based on the search signal are essential functions. is there. Further, the terminal control means 10 of the communication terminal 2 must have a perspective determination function for determining whether the communication terminal 1 or the communication terminal 2 that is the transmission source of the search signal is close to the target point T. . A search signal output function for creating a search response signal if the communication terminal 2 is close, and canceling the search response signal creation if the communication terminal 2 is far is essential.

  FIG. 3 is a block diagram showing the minimum configuration of the communication terminal system according to the first embodiment of the present invention. FIG. 4 is a block diagram illustrating a minimum configuration of the communication terminal 1 according to the first embodiment of this invention. FIG. 5 is a block diagram illustrating a minimum configuration of the communication terminal 2 according to the first embodiment of this invention. With reference to FIGS. 3-5, the structure and operation | movement of the communication terminal system 200 of this embodiment and the communication terminals 4a and 4b are demonstrated.

  The communication terminal system 200 does not include the information processing apparatus 3 described with reference to FIG. 1, but includes communication terminals 4a and 4b. The communication terminal 4a is different from the communication terminal 1 described in FIG. 2 in that the terminal control means 10 is changed to the terminal control means 40, the terminal communication means 11 is changed to the search transmission means 41 and the search response reception means 42, and the apparatus communication Except that the means 12 is not provided, it has the same configuration as that of FIG. Therefore, the same components as those in FIG. 2 are denoted by the same names and the same numbers, and the description thereof is omitted.

  The communication terminal 4b is different from the communication terminal 4a shown in FIG. 4 in that the terminal control means 40 is changed to the terminal control means 43, and the search transmission means 41 is changed to the search reception means 44 and the search response transmission means 45. The configuration is the same as that shown in FIG. Therefore, the same components as those in FIG. 4 are denoted by the same names and the same numbers, and the description thereof is omitted.

  The communication terminal 4 a includes terminal control means 40, search transmission means 41, search response reception means 42, and positioning means 13. The terminal control means 40 has the search signal output function and the destination determination function described above. The search transmission means 41 has a search transmission function. The search response receiving means 42 has a search response receiving function.

  The communication terminal 4 b includes terminal control means 43, search reception means 44, search response transmission means 45, and positioning means 13. The terminal control means 43 has the above-described distance determination function and search response signal output function. The search reception means 44 has a search reception function. The search response transmission unit 45 has a search response transmission function.

  The terminal control means 40 of the communication terminal 4a generates search signals for searching for communication terminals closest to the target point T, when search request information including the position information T of the target point T is designated from the outside, and transmits the search signal. Output to means 41. The search signal includes the position information of the communication terminal 4a acquired by the positioning means 13, the identification information of the own terminal, and the position information T of the target point T.

  The search transmission means 41 broadcasts the search signal input from the terminal control means 40.

  The search receiving means 44 of the communication terminal 4 b receives the search signal from the communication terminal 4 a and outputs it to the search control means 43. The search control means 43 makes a perspective determination based on the position information of the communication terminal 4a, the position information T of the target point T included in the search signal, and the position information acquired by the positioning means 13 of the own terminal. The search control unit 43 determines which of the communication terminal 4a and the own terminal is near the target point T based on the respective position information.

  When the search control unit 43 determines that the terminal is close to the target point T, the search control unit 43 creates a search response signal including the identification information and position information of the terminal and outputs the search response signal to the search response output unit 45. When the search control unit 43 determines that the terminal is far from the target point T, the search control unit 43 stops generating the search response signal and outputting it to the search response unit.

  The search response transmission means 45 receives the search response signal from the terminal control means 43 and broadcasts the search response signal.

  The search response receiving means 42 of the communication terminal 4 a receives the search response signal transmitted by making a perspective determination based on the position information T of the target point T included in the search signal, and outputs it to the terminal control means 40.

  The terminal control means 40 determines the destination terminal based on the search response signal input from the search response receiving means 42 within a predetermined time after outputting the search signal. That is, the terminal control means 40 determines the communication terminal closest to the target point T as the destination terminal based on the location information of the transmission source included in the search response signal received within a predetermined time. Further, the terminal control means 40 determines that its own terminal is the destination terminal when the search response signal is not received within a predetermined time.

  As described above, the communication terminal 4a transmits a search signal including the position information T of the target point T, and selects the search response signal received corresponding to the search signal from the communication terminal of the transmission source to the target point T. The nearest communication terminal can be found. Further, when the search response signal is not received, the communication terminal 4a determines that the communication terminal 4a itself that has transmitted the search signal is the communication terminal closest to the target point T.

  In the communication terminal system 200 of the present embodiment, the communication terminal 4b determines that the communication terminal 4b is farther from the target point T than the communication terminal 4a, and stops creating and transmitting a search response signal. Therefore, the communication terminal 4a does not receive the search response signal within a predetermined time, and therefore determines that the communication terminal 4a itself is the destination terminal.

  As described above, the communication terminal system 200 according to the present embodiment can find the communication terminal closest to the predetermined target point, similarly to the communication terminal system 100.

In the present embodiment, the search request information including the position information T of the target point T is described as being specified from the outside. However, the specification of the position information T of the target point T is not necessarily performed from the outside. For example, the position information T of the target point T may be set in advance in the communication terminal.
(Second Embodiment)
A second embodiment of the present invention will be described. FIG. 6 is a block diagram illustrating a configuration example of the communication terminal system 300 according to the present embodiment. FIG. 7 is a block diagram illustrating a configuration example of the communication terminal 5 of the present embodiment. With reference to FIG. 6, the structure of the communication terminal system 300 of this embodiment is demonstrated.

  In the communication terminal system 300, six communication terminals 5 shown in FIG. 7 are arranged. Henceforth, when distinguishing the six communication terminals 5, each communication terminal 5 is called communication terminal A, B, C, D, E, F. Communication terminals 5 connected by arrows indicate that radio waves reach each other directly. For example, the radio waves of the communication terminal A reach the communication terminals B, C, and D directly, but do not reach the communication terminals E and F directly.

  The information processing device 3 transmits to the communication terminal A a search request signal for finding the communication device 6 that is closest to the target point T.

  With reference to FIG. 7, the structure of the communication terminal 5 of this embodiment is demonstrated. The communication terminal 5 has the same configuration as that in FIG. 2 except that the terminal control unit 10 of the communication terminal 1 described in FIG. 2 is changed to a terminal control unit 50. Therefore, the same components as those in FIG. 2 are denoted by the same names and the same numbers, and the description thereof will be omitted. Differences will be described.

  The terminal control means 50 is added to the functions of the terminal control means 10 with functions related to selection of a transmission terminal that transmits a search signal in the next communication section and transmission / reception of route information thereof. Since the transmitting terminal transmits a search signal and relays communication with the destination terminal, it is hereinafter referred to as a relay terminal. The selection of relay terminals and the exchange of route information will be described later.

  FIG. 8 is a sequence diagram illustrating an operation example of the communication terminal system 300 according to the present embodiment. With reference to FIGS. 6-8, operation | movement of the communication terminal system 300 of this embodiment is demonstrated.

  The information processing device 3 unicasts a search request signal for requesting a search for the communication terminal 5 closest to the target point T to the communication terminal A (S101). The search request signal from the information processing device 3 includes the identification information A of the communication terminal A and the position information T of the target point T.

  The communication terminal A starts an operation for searching for the communication terminal 5 closest to the target point T as the source terminal that has received the search request signal from the information processing device 3. Specifically, the communication terminal A receives the search signal including the identification information A of the communication terminal A, the position information A of the communication terminal A acquired by the positioning means 13 of the communication terminal A, and the position information T of the target point T. And broadcast to other communication terminals 5 (S102).

  The search signal transmitted from the communication terminal A is received by the communication terminals B, C, and D. Here, the operation of communication terminal B that has received the search signal will be described.

  When the communication terminal B receives the search signal from the communication terminal A, which terminal is the target based on the position information A of the communication terminal A included in the search signal and the position information B acquired by the positioning means 13 of the communication terminal B. A perspective determination is made as to whether it is close to the point T. If the communication terminal B determines that the terminal is closer to the target point T than the communication terminal A, the communication terminal B creates a search response signal including the identification information B and the position information B of the communication terminal B and broadcasts it (S103). .

  The search response signal transmitted from the communication terminal B is received by the communication terminals A, C, D, and E.

  On the other hand, if the communication terminal B determines that its own terminal is farther from the target point T than the communication terminal A, the communication terminal B stops creating and transmitting the search response signal described above.

  The communication terminals C and D that have received the search signal from the communication terminal A make the same determination as that of the communication terminal B described above, and create and transmit a search response signal based on the respective determination results. Here, each of the communication terminals C and D determines that its own terminal is closer to the target point T than the communication terminal A, and creates and transmits a search response signal. In the sequence diagram of FIG. 8, transmission of search response signals of the communication terminals C and D is omitted.

  Communication terminal A receives the search response signal transmitted based on the determination results of communication terminals B, C, and D. Then, the communication terminal A waits for reception of the search response signal for a predetermined time after transmitting the search signal, and ends reception of the search response signal.

  Based on the location information of the transmission source included in the search response signal received within a predetermined time, the communication terminal A selects the communication terminal 5 closest to the target point T from the transmission source communication terminals 5 as a relay terminal. Select.

  Here, the communication terminal A selects the communication terminal B closest to the target point T as a relay terminal in the next communication section.

  The communication terminal A creates a “next route determination signal” to the communication terminal B and transmits it by unicast (S104). The “next route determination signal” is a signal for notifying that a communication terminal which is a source terminal or a relay terminal is a next relay terminal to a communication terminal designated as a relay terminal in the next communication section. Therefore, the next path determination signal includes the identification information A of the communication terminal A that is the source terminal and the identification information B of the communication terminal B that is designated as the relay device in the next communication section.

  In this way, the communication terminal A can select the communication terminal B closest to the target point T from among the communication terminals 5 directly receiving the radio waves of the communication terminal A as a relay terminal in the next communication section.

  When receiving the next route determination signal from the communication terminal A, the communication terminal B creates a search signal and broadcasts it, as with the communication terminal A (S105). The search signal includes identification information B and position information B of the communication terminal B, and position information T of the target point T.

  The search signal transmitted from the communication terminal B is received by the communication terminals A, C, D, and E. The operation of the communication terminal E that has received the search signal will be described.

  When the communication terminal E receives the search signal from the communication terminal B, which terminal is based on the position information B of the communication terminal B included in the search signal and the position information E acquired by the positioning means 13 of the communication terminal E. A perspective determination is made as to whether it is close to the target point T. Then, the communication terminal E determines that its own terminal is closer to the target point T than the communication terminal B, creates a search response signal including the identification information E and the position information E of the communication terminal E, and broadcasts it (S106). . The search response signal transmitted from the communication terminal E is received by the communication terminals B, C, and F.

  If the communication terminal E determines that its own terminal is farther from the target point T than the communication terminal B, the communication terminal E stops creating and transmitting the search response signal described above.

  The communication terminals C and D that have received the search signal from the communication terminal B make the same determination as that of the communication terminal E described above, and create and transmit a search response signal based on the respective determination results. In the block diagram of FIG. 6, each of the communication terminals C and D determines that its own terminal is farther from the target point T than the communication terminal B, and stops creating and transmitting a search response signal.

  The communication terminal B receives the search response signal transmitted from the communication terminal E. Then, the communication terminal B waits for reception of the search response signal for a predetermined time after transmitting the search signal, and ends reception of the search response signal.

  Based on the location information of the transmission source included in the search response signal received within the predetermined time, the communication terminal B selects the communication terminal 5 closest to the target point T from the transmission source communication terminals 5 as a relay terminal. Select. Here, since the communication terminal B receives only the search response signal from the communication terminal E, the communication terminal E is selected as the communication terminal 5 closest to the target point T. That is, the communication terminal B selects the communication terminal E as a relay terminal for the next communication section.

  The communication terminal B creates a next route determination signal and transmits it to the communication terminal E by unicast (S107). In the next route confirmation signal, the identification information A of the communication terminal A that is the source terminal, the identification information B of the communication terminal B that is the relay terminal of the immediately preceding communication section, and the communication terminal designated as the relay device of the next communication section The identification information E of E is included.

  As described above, the communication terminal B can select the communication terminal E closest to the target point T from among the communication terminals 5 directly receiving the radio waves of the communication terminal B as the relay terminal in the next communication section.

  When receiving the next route determination signal from the communication terminal B, the communication terminal E creates a search signal and broadcasts it, similarly to the communication terminal B (S108). The search signal includes identification information E and position information E of the communication terminal E, and position information T of the target point T.

  The search signal transmitted from the communication terminal E is received by the communication terminals B, C, and F. The operation of the communication terminal F that has received the search signal will be described.

  When the communication terminal F receives the search signal from the communication terminal E, which terminal is the target based on the position information E of the communication terminal E included in the search signal and the position information F acquired by the positioning means 13 of the communication terminal F. A perspective determination is made as to whether it is close to the point T. Then, the communication terminal F determines that its own terminal is farther from the target point T than the communication terminal E, and stops creating and transmitting a search response signal.

  Similarly to the communication terminal F, each of the communication terminals B and C determines that the communication terminal E is farther from the target point T than the communication terminal E, and stops creating and transmitting a search response signal.

  The communication terminal E waits for reception of the search response signal for a predetermined time after transmitting the search signal, and ends reception of the search response signal.

  At this time, the communication terminal E does not receive the search response signal from the other communication terminals 5 within a predetermined time, and thus determines that the communication terminal E itself is the communication terminal 5 closest to the target point T. That is, the communication terminal E becomes the communication terminal 5 (destination terminal) closest to the target point T requested by the information processing device 3 for search.

  The communication terminal E creates a “route response signal” and unicasts it to the communication terminal B that is a relay terminal in the immediately preceding communication section (S109).

  The “route response signal” is a signal created when the communication terminal 5 serving as a relay terminal determines that its own terminal is the destination terminal. The route response signal is a signal for notifying the source terminal of route information to the destination terminal. Here, the route response signal includes identification information A of the communication terminal A that is the source terminal, identification information B of the communication terminal B that is the relay terminal of the immediately preceding communication section, and identification information E of the communication terminal E that is the destination terminal. included.

  When the communication terminal B, which is a relay terminal immediately before the communication terminal E, receives the route response signal from the communication terminal E, the communication terminal B transmits the route response signal to the communication device A, which is the relay terminal (source terminal) immediately before the communication terminal B. The cast is transmitted (S110).

  When receiving the route response signal from the communication terminal B, the communication terminal A creates a “search request response signal” and unicasts it to the information processing apparatus 3 (S111).

  The “search request response signal” notifies the information processing apparatus 3 that the communication terminal A has completed the search for the communication route to the communication terminal E (destination terminal) closest to the target point T requested by the search request signal. Signal.

  Then, the communication terminal A may create a routing table indicating a communication path to the communication terminal E that is the destination terminal.

  In the routing table, identification information A of the communication terminal A that is the source terminal, identification information B of the communication terminal B that is the immediately preceding relay terminal, and identification information E of the communication terminal E that is the destination terminal are posted.

  In this way, the communication terminal A transmits the search signal and receives the search request signal including the position information T of the target point T from the information processing device 3, and is the communication terminal 5 closest to the target point T. Explore. Then, the communication terminal A can receive the route response signal from the communication terminal E that is the destination terminal and acquire information on the communication route to the communication terminal E. The communication terminal A notifies the information processing apparatus 3 that the search for the communication route to the communication terminal E (destination terminal) closest to the target point T has been completed with a search request response signal.

  As described above, the communication terminal system 300 according to the present embodiment can find the communication terminal closest to the predetermined target point, as in the first embodiment. Furthermore, in the communication terminal system 300 of the present embodiment, the relay terminals are sequentially selected, so that the destination terminal can be found even when the radio waves of the source terminal do not reach directly.

  Note that the sequence of the communication terminal system 300 shown in FIG. 8 is illustrated as an embodiment of the operation of the communication terminal 5 according to the present invention, and the operation of the present invention is not limited to that shown in this sequence. .

  For example, although the search response signal has been described as being transmitted by broadcast, the search response signal may be generated with the transmission source of the search signal as the destination and transmitted by unicast.

  Moreover, although this embodiment demonstrated the communication terminal 5 as six units, the number of the communication terminals 5 of the communication terminal system of this invention should just be one or more.

  FIG. 9 and FIG. 10 are flowcharts showing an operation example of the communication terminal 5 according to the second embodiment of the present invention. The operation of the communication terminal 5 will be described with reference to FIG.

  The communication terminal 5 confirms reception of a search request signal for requesting a search for the communication terminal 5 closest to the target point T from the information processing device 3 (S201).

  When the communication terminal 5 confirms the reception of the search request signal from the information processing apparatus 3 (S201: Yes), the communication terminal 5 proceeds to the process of step S301 in the flowchart shown in FIG. At this time, the communication terminal 5 operates as a source terminal. The operation of the communication terminal 5 as the source terminal will be described later with reference to FIG.

  If the communication terminal 5 does not confirm the reception of the search request signal from the information processing device 3 (S201: No), it confirms the reception of the search signal from another communication terminal 5 (source terminal or relay terminal) (S202). ).

  If the communication terminal 5 does not confirm reception of the search signal (S202: No), the communication terminal 5 returns to the process of step S201.

  If the communication terminal 5 confirms reception of the search signal (S202: Yes), the position of the source terminal or relay terminal that transmitted the search signal (included in the search signal) and the position acquired by the positioning means 13 of the own terminal To determine which terminal is closer to the target point T (S203).

  If the communication terminal 5 determines that the position of the own terminal is farther from the target point T than the position of the source terminal or the relay terminal (S203: No), the communication terminal 5 returns to the process of step S201.

  On the other hand, if the communication terminal 5 determines that the position of its own terminal is closer to the target point T than the position of the source terminal or the relay terminal (S203: Yes), it creates a search response signal and broadcasts it (S204). The search response signal includes position information and identification information acquired by the positioning means 13 of the communication terminal 5 that transmits the search response signal.

  When transmitting the search response signal, the communication terminal 5 confirms reception of the next route determination signal (S205). The next route determination signal includes the identification information of the relay terminal from the source terminal to the previous communication section and the identification information of the communication terminal 5 designated as the relay terminal of the next communication section.

  If the communication terminal 5 confirms the reception of the next route determination signal (S205: Yes), the communication terminal 5 proceeds to the process of step S301 in the flowchart shown in FIG. At this time, the communication terminal 5 operates as a relay terminal. The operation of the communication terminal 5 as a relay terminal will also be described later with reference to FIG.

  On the other hand, if the communication terminal 5 does not confirm the reception of the next route determination signal (S205: No), the communication terminal 5 determines whether or not a predetermined time has elapsed since the reception of the search signal (S206). If the predetermined time has not elapsed since the reception of the search signal (S206: No), the communication terminal 5 returns to the process of step S205 for confirming the reception of the next path determination signal.

  If a predetermined time has elapsed since the reception of the search signal (S206: Yes), the communication terminal 5 returns to the process of step S201 for confirming reception of the search request signal from the information processing device 3.

  Thus, if the communication terminal 5 receives the search request signal, it operates as a source terminal. Then, when receiving the search signal, the communication terminal 5 compares the position of the source terminal or the relay terminal included in the search signal with the position of the own terminal and determines which terminal is closer to the target point T. The communication terminal 5 that has determined that its own terminal is closer to the target point T creates and transmits a search response signal.

  If the communication terminal 5 receives the next route determination signal from the source terminal or the relay terminal, the communication terminal 5 operates as a relay terminal. On the other hand, if the communication terminal 5 does not receive the next route determination signal from the source terminal or the relay terminal, the communication terminal 5 continues the process of receiving the search request signal and the search signal.

  The operation of the communication terminal 5 as a source terminal or relay terminal will be described with reference to FIG. As described with reference to FIG. 9, if the communication terminal 5 confirms reception of the search request signal from the information processing apparatus 3 (S201: Yes), the communication terminal 5 operates as a source terminal. Further, if the communication terminal 5 confirms reception of the next route determination signal from another communication terminal 5 (source terminal or relay terminal) (S205: Yes), the communication terminal 5 operates as a relay terminal.

  In FIG. 10, the communication terminal 5 operates as a source terminal or a relay terminal. Each of the communication terminals 5 serving as a source terminal or a relay terminal creates a search signal and broadcasts it (S301). Here, description will be made assuming that the communication terminal 5 operates as a relay terminal.

  The search signal transmitted from the relay terminal is received by each communication terminal 5 located within the communication area of the relay terminal. Each communication terminal 5 that has received the search signal creates a search response signal based on a predetermined determination result and broadcasts it. The relay terminal confirms reception of the search response signal (S302).

  If the relay terminal confirms reception of the search response signal (S302: Yes), the relay terminal stores the received search response signal in the terminal control means 50 (S303). Then, the relay terminal determines whether or not a predetermined time has elapsed since the search signal was transmitted (S304).

  If the relay terminal does not confirm the reception of the search response signal (S302: No), the process proceeds to step S304.

  If the predetermined time has not elapsed since the transmission of the search signal (S304: No), the relay terminal returns to the process of step S302 for confirming reception of the search response signal.

  On the other hand, if a predetermined time has elapsed since the transmission of the search signal (S304: Yes), the relay terminal confirms reception of the search response signal within the predetermined time (S305).

  At this time, if reception of the search response signal from the other communication terminal 5 is confirmed (S305: Yes), the relay terminal is based on the location information of the transmission source of the search response signal stored in the terminal control means 50. The communication terminal 5 closest to the target point T is selected as the relay terminal for the next communication section from among the communication terminals 5 that are the transmission sources. Then, the relay terminal unicasts a next path determination signal to the selected communication terminal 5 (S306). Then, the relay terminal confirms reception of the route response signal (S307).

  If the reception of the route response signal is not confirmed (S307: No), the relay terminal remains in the process of step S307. If the reception of the route response signal is confirmed (S307: Yes), the relay terminal proceeds to the process of step S309 for confirming whether or not it is the source terminal.

  On the other hand, if the reception of the search response signal from the other communication terminal 5 is not confirmed (S305: No), the relay terminal has not received the search response signal from the other communication terminal 5, so It is determined that the communication terminal 5 (destination terminal) is closest to T. Based on the determination result, the relay terminal creates a route response signal including identification information of the terminal itself as a destination terminal (S308). At this time, the own terminal (relay terminal) proceeds to the process of step S309 for confirming whether or not it is the source terminal.

  The own terminal (relay terminal) checks whether or not it is a source terminal (S309). If the own terminal is not the source terminal (S309: No), the relay terminal uses the route response signal created as the destination terminal or the route response signal received as the relay terminal as the relay terminal (communication terminal 5) in the immediately preceding communication section. (S310).

  If the own terminal (relay terminal) is the source terminal (S309: Yes), the own terminal (source terminal) performs routing based on the contents of the route response signal created as the destination terminal or the route response signal received as the source terminal. A table is created (S311). Then, the own terminal (source terminal) creates a search request response signal that informs the information processing device 3 that the search for the communication route to the communication terminal 5 (destination terminal) closest to the target point T has been completed. The data is transmitted to the processing device 3 (S312).

  As described above, the communication terminal 5 operates as a source terminal when it receives a search request signal, and operates as a relay terminal when it receives a next route determination signal.

  Regardless of the operation as either terminal, the communication terminal 5 creates and transmits a search signal, and based on the position information of the transmission source of the search response signal received within a predetermined time, the communication of the transmission source The communication terminal 5 closest to the target point T is selected from the terminals 5 and designated as the relay terminal in the next communication section.

  Further, when the search response signal is not received within a predetermined time, it is determined that the communication terminal 5 itself that has transmitted the search signal is the communication terminal 5 (destination terminal) closest to the target point T.

  Then, the communication terminal 5 that has become the destination terminal creates a route response signal in which the identification information of the terminal that is the destination terminal is added to the content of the received next route determination, and transmits the route response signal to the relay terminal in the immediately preceding communication section. To do.

  The route response signal is transmitted retroactively from the relay terminal toward the source terminal. The communication terminal 5 that is the source terminal that has received the route response signal creates a routing table based on the content of the route response signal, and searches that the search for the communication route to the communication terminal 5 closest to the target point T has been completed. A request response signal is created and notified to the information processing terminal 3.

  As described above, the communication terminal system 300 according to the present embodiment can find the communication terminal closest to the predetermined target point.

  The flowchart of the communication terminal 5 shown in FIGS. 9 and 10 is illustrated as an embodiment of the operation of the communication terminal 5 according to the present invention, and the operation of the communication terminal of the present invention is shown in this flowchart. It is not limited to things.

  For example, the routing table shown in step S311 of FIG. 10 may not be created.

  FIG. 11 is an explanatory diagram illustrating an operation example of the communication terminal 5 according to the second embodiment of this invention. With reference to FIG. 11, the search response signal creation and transmission determination operation of communication terminal 5 will be described.

  In the communication terminal system 400 of FIG. 11, seven communication terminals 5 are arranged. Henceforth, when distinguishing the seven communication terminals 5, each communication terminal 5 is called communication terminal 00, 01, 02, 03, 04, 11, 12.

  The communication terminal 00 is a source terminal, and a circle indicated by a dotted line centering on the communication terminal 00 indicates a communication area 00 where radio waves of the communication terminal 00 reach.

  The search signal 00 transmitted by the communication terminal 00 is received by the communication terminals 01, 02, 03, 04 located in the communication area 00 of the communication terminal 00, respectively. The communication terminals 01, 02, 03, 04 that have received the search signal 00 are based on the position information of the communication terminal 00 included in the search signal 00 and the position information of the own terminal acquired by each positioning means 13. It is determined which terminal, 00 or its own terminal, is closer to the target point T.

  Then, based on the determination result, the communication terminals 01, 02, 03, 04 respectively determine whether to create and send a search response signal.

  For example, when the communication terminal 03 determines that the position of the own terminal is farther from the target point T than the communication terminal 00, the generation and transmission of the search response signal are stopped. If the communication terminals 01, 02, 04 each determine that the position of the own terminal is closer to the target point T than the communication terminal 00, the communication terminals 01, 02, 04 create and transmit a search response signal.

  That is, the communication terminal 5 located in the area (response area 00) indicated by the intersection of the circle indicating the communication area 00 of the communication terminal 00 and the circle having the radius from the target point T to the communication terminal 00 is shown. When the search signal 00 is received from the communication terminal 00, the search response signal is generated and transmitted.

  The communication terminal 00 receives the search response signals 01, 02, 04 transmitted from the communication terminals 01, 02, 04 in response to the search signal 00, respectively. The communication terminal 00 is the communication terminal 04 closest to the target point T based on the position information of each terminal included in the search response signals 01, 02, 04 received within a predetermined time after transmitting the search signal 00. Is selected as the relay terminal 04 in the next communication section. Then, the communication terminal 00 unicasts the next route determination signal 00 to the selected communication terminal 04.

  Similar to the communication terminal 00, the communication terminal 04 selected as the relay terminal 04 transmits the search signal 04 and selects the next relay terminal.

  FIG. 12 is an explanatory diagram of an operation when the communication terminal 04 in FIG. 11 is selected as the relay terminal 04 in the next communication section. The operation of the relay terminal 04 will be described with reference to FIG.

  A circle indicated by a dotted line centering on the relay terminal 04 indicates a communication area 04 in which the radio wave of the relay terminal 04 reaches.

  The search signal 04 transmitted from the relay terminal 04 is received by the communication terminals 00, 01, 02, 11, and 12 located in the communication area 04 of the relay terminal 04. The communication terminals 00, 01, 02, 11, and 12 that have received the search signal 04 are based on the position information 04 of the relay terminal 04 included in the search signal 04 and the position information of the own terminal acquired by each positioning means 13. Then, it is determined which of the relay terminal 04 and the own terminal is closer to the target point T.

  Then, based on the determination result, the communication terminals 00, 01, 02, 11, and 12 each determine whether or not to create and transmit a search response signal.

  For example, when the communication terminals 00, 01, 02 determine that the own terminal is farther from the target point T than the relay terminal 04, the creation and transmission of the search response signal is stopped. When the communication terminals 11 and 12 determine that their own terminal is closer to the target point T than the relay terminal 04, the communication terminals 11 and 12 create and transmit a search response signal.

  The relay terminal 04 receives the search response signals 11 and 12 transmitted from the communication terminals 11 and 12 in response to the search signal 04, respectively. The relay terminal 04 selects the communication terminal 12 closest to the target point T based on the position information of each communication terminal 5 included in the search response signals 11 and 12 received within a predetermined time after transmitting the search signal 04. The relay terminal 12 in the next communication section is selected.

  As described above, the communication terminal 04 selected as the relay terminal 04 can transmit the search signal 04 and select the next relay terminal 12 in the same manner as the communication terminal 00.

  The communication terminal 12 selected as the next relay terminal 12 transmits the search signal 12 and selects the next relay terminal in the same manner as the communication terminal 00 and the immediately preceding relay terminal 04.

  When the search signal 12 is transmitted and the search response signal cannot be received within a predetermined period, the relay terminal 12 that has transmitted the search signal 12 is the communication terminal 5 that is closest to the target point T, that is, the destination. Judge that it is a terminal.

  As described above, the communication terminal systems 300 and 400 according to the present embodiment can find the communication terminal closest to the predetermined target point, as in the first embodiment. In the communication systems 300 and 400 of this embodiment, the source terminal selects a relay terminal in the next communication section, and the selected relay terminal further selects a relay terminal in the next communication section. In this embodiment, the source terminal and the relay terminal sequentially select the relay terminal in the next communication section, so that the destination terminal can be found even when the radio wave of the source terminal does not reach directly.

In the communication terminal system 400 of the present embodiment, the number of communication terminals 5 has been described as seven. However, the number of communication terminals in the communication terminal system of the present invention may be one or more.
(Third embodiment)
FIG. 13 is an explanatory diagram illustrating an operation example of the communication terminal 6 according to the third embodiment of this invention. With reference to FIG. 13, the search response signal creation and transmission determination operation of the communication terminal 6 of the present embodiment will be described.

  The communication terminal 6 of the present embodiment is different from the communication terminal 5 described with reference to FIGS. 11 and 12 in the generation of the search response signal and the determination operation of transmission, and the difference will be described.

  In the communication terminal system 500 of FIG. 13, five communication terminals 6 are arranged. The communication terminal 6 (own terminal) that has received the search signal determines which of the communication terminal 6 that has transmitted the search signal and the own terminal is closer to the target point T when the search response signal is generated and transmitted. The creation and transmission of the search response signal based on the result is the same as that of the communication terminal 5.

  At this time, if the communication terminal 6 (own terminal) receives the search response signal transmitted by the other communication terminal 6 in advance, which of the communication terminal 6 that transmitted the search response signal and the own terminal is determined. The communication terminal 5 is different from the communication terminal 5 in that it is further determined whether it is close to the target point, and the search response signal is generated and transmitted based on the determination result.

  In the communication terminal system 500 of FIG. 13, when distinguishing five communication terminals 6, each communication terminal 6 is called communication terminal 00, 01, 02, 03, 04.

  The communication terminal 00 is a source terminal, and a circle indicated by a dotted line centering on the communication terminal 00 indicates a communication area 00 where radio waves of the communication terminal 00 reach.

  The search signal 00 transmitted by the communication terminal 00 is received by the communication terminals 01, 02, 03, 04 located in the communication area 00 of the communication terminal 00, respectively. The communication terminals 01, 02, 03, 04 that have received the search signal 00 are determined based on the position information 00 of the communication terminal 00 included in the search signal 00 and the position information of the own terminal acquired by each positioning means 13. It is determined whether the terminal is close to the target point T.

  Further, the communication terminal 6 receives the search response signal broadcasted from the other communication terminal 6 in advance. Then, the communication terminal 6 determines which terminal is closer to the target point T based on the position information of the other communication terminal 6 and the position information of the own terminal included in the search response signal. Based on the determination results, the communication terminals 01, 02, 03, and 04 each determine whether to create and send a search response signal.

  For example, when it is determined that the communication terminal 02 that has received the search signal 00 from the communication terminal 00 is closer to the target point T than the communication terminal 00 before the other communication terminals 01 and 04, the search response signal 02 is generated and broadcast. Send.

  When the communication terminal 01 receives the search signal 00 and the search response signal 02 and determines that it is closer to the target point T than the communication terminal 00 but is farther from the target point T than the communication terminal 02, the search terminal Cancel creation and transmission.

  On the other hand, when the communication terminal 04 receives the search signal 00 and the search response signal 02 and determines that the communication terminal 00 is closer to the target point T than the communication terminal 00 and further closer to the target point T than the communication terminal 02, the search response signal 04 Create and send.

  As described above, in the communication terminal system 500 according to the present embodiment, the target point T is determined based on the position information of the communication terminal 6 and the position information of the own terminal included in the search signal and the search response signal broadcast in advance. Determine which terminal is closer. And the communication terminal 6 judged that the own terminal is near creates and transmits a search response signal. Therefore, in the communication terminal system 500 of this embodiment, the position information of the communication terminal 6 that has transmitted the search signal, the position information of the communication terminal 6 that is the transmission source of the search response signal transmitted in advance, and the position of the own terminal Perspective determination is performed based on information. Therefore, when the communication terminal 6 of this embodiment determines that the own terminal is farther from the target point T than those terminals, the communication terminal 6 stops creating and transmitting a search response signal.

  As described above, this embodiment can find the communication terminal closest to the target point, as in the first and second embodiments. In this embodiment, each communication terminal makes a distance determination from the target point T to the terminal including the position information of the communication terminal that has transmitted the search response signal in advance. Since each communication terminal responds and transmits a search response signal based on the determination result, the present embodiment uses the first and second communication traffic of the search response signal related to the discovery of the destination terminal and the selection of the relay terminal. It can reduce compared with embodiment of this.

In the communication terminal system 500 of this embodiment, the number of communication terminals 6 has been described as five. However, the number of communication terminals in the communication terminal system of the present invention may be one or more.
(Fourth embodiment)
FIG. 14 is an explanatory diagram illustrating an operation example of the communication terminal 7 according to the fourth embodiment of this invention. With reference to FIG. 14, the search response signal creation and transmission determination operation of the communication terminal 7 of the present embodiment will be described.

  The communication terminal 7 of the present embodiment is different from the communication terminals 5 and 6 described with reference to FIGS. 11 and 13 in the generation of the search response signal and the determination operation of the transmission.

  In the communication terminal system 600 of FIG. 14, five communication terminals 7 are arranged. The communication terminal 7 (own terminal) that has received the search signal determines which of the communication terminal 7 that has transmitted the search signal and the own terminal is closer to the target point T when creating and transmitting the search response signal. The creation and transmission of the search response signal based on the result is the same as that of the communication terminals 5 and 6.

  Then, if the communication terminal 7 (own terminal) receives a search response signal transmitted in advance by another communication terminal 7, which of the communication terminal 7 and the own terminal that transmitted the search response signal is received. It is the same as that of the communication terminal 6 that it is further determined whether the terminal is close to the target point, and the search response signal is generated and transmitted based on the determination result.

  The communication terminal 7 (self terminal) is different from the communication terminal 6 in that it determines after waiting for a predetermined waiting time when determining the creation and transmission of the search response signal after receiving the search signal. . That is, the communication terminal 7 determines whether to create and transmit a search response signal after a predetermined waiting time has elapsed after receiving the search signal.

  In the communication terminal system 600 of FIG. 14, when distinguishing five communication terminals 7, the respective communication terminals 7 are referred to as communication terminals 00, 01, 02, 03, 04. The communication terminal 00 is a source terminal, and a circle indicated by a dotted line centering on the communication terminal 00 indicates a communication area 00 where radio waves of the communication terminal 00 reach.

  The search signal 00 transmitted by the communication terminal 00 is received by the communication terminals 01, 02, 03, 04 located in the communication area 00 of the communication terminal 00, respectively. The communication terminals 01, 02, 03, 04 that have received the search signal 00 are determined based on the position information 00 of the communication terminal 00 included in the search signal 00 and the position information of the own terminal acquired by each positioning means 13. It is determined whether the terminal is close to the target point T.

  Further, a search response signal transmitted in advance by another communication terminal 7 is received, and based on the location information of the communication terminal 7 and the location information of the own terminal included in the search response signal, which terminal is the target location Judge whether it is close to T.

  Based on the determination results, the communication terminals 01, 02, 03, and 04 determine whether to create a search response signal and perform broadcast transmission, respectively.

  At this time, predetermined standby times 01, 02, 03, and 04 indicating the timing for performing the above determination are set in the communication terminals 01, 02, 03, and 04 that have received the search signal 00, respectively. For example, the communication terminal 01 calculates a distance 0100 between the communication terminal 00 and the own terminal and a distance 01T between the target point T and the own terminal, and the predetermined distance based on the calculated distance 0100 and the distance 01T. Standby time 01 is set.

  Specifically, the distance between the communication terminal 00 and the own terminal and the distance between the target point T and the own terminal are calculated, and the communication terminal 7 having a small total value of the two calculated distances is A short waiting time is set. On the other hand, a longer standby time is set for the communication terminal 7 having a larger total value of the two calculated distances. In communication terminal system 600, communication terminals 04, 02, 01, 03 are arranged from communication terminals 7 with short standby times set in communication terminals 01, 02, 03, 04.

  Therefore, the communication terminal 04 set with the shortest standby time makes a search response signal and decides transmission before the other communication terminals 01, 02, 03. Based on the determination result, the communication terminal 04 creates a search response signal 04 and broadcasts it. The transmitted search response signal 04 is received by the communication terminals 01, 02, 03.

  Then, the other communication terminals 01, 02, 03 determine the creation and transmission of the search response signal in the order of the set standby times. Each of the communication terminals 01, 02, 03 determines the creation of the search response signal and the suspension of transmission because the own terminal is farther from the target point T than the communication terminal 04 that has transmitted the previously received search response signal 04. .

  As described above, in the present embodiment, each communication terminal 7 that has received a search signal is set with a standby time for determining timing in order to determine creation and transmission of a search response signal. Then, in order from the shorter standby time set, it is determined whether each communication terminal 7 creates and transmits a search response signal. The standby time of each communication terminal 7 is the short standby time in order from the smallest of the two distances of the distance from each communication terminal 7 to the communication terminal 00 and the distance from each communication terminal 7 to the target point T. Is set.

  In the present embodiment, the communication terminal 7 in which a short standby time is set first performs a perspective determination and transmits a search response signal. The communication terminal 7 in which a longer standby time is set makes a perspective determination with the own terminal including the transmission source of the search response signal transmitted in advance. For this reason, the communication terminal 7 that determines that the terminal itself is farther from the target point stops generating and transmitting the search response signal.

  As described above, the present embodiment can find the communication terminal closest to the predetermined target point, as in the first to third embodiments. In this embodiment, the search response signal related to the selection of the relay terminal is set in order to set the standby time for determining the creation and transmission of the search response signal after the communication terminal 7 receives the search signal based on a predetermined condition. Communication traffic can be further reduced than in the third embodiment.

  In the present embodiment, it has been described that the setting of the standby time for determining the generation and transmission of the search response signal is set based on the transmission signal source and the total distance from the target point T to the terminal itself. It is not essential to set the waiting time based on the total distance. The waiting time can be set using an arbitrary monovalent function having the above two distances as arguments.

  Note that the waiting time set for each communication terminal is the destination terminal when the source terminal or the relay terminal transmits a search signal and waits for reception of the search response signal and no search response signal is received. May be set to a continuous time or a time having a predetermined interval.

Moreover, although the communication terminal system 600 of this embodiment demonstrated the communication terminal 7 as five units, the number of the communication terminals of the communication terminal system of this invention should just be one or more.
(Fifth embodiment)
FIG. 15 is a block diagram illustrating a configuration example of the communication terminal 8 according to the fifth embodiment of the present invention. With reference to FIG. 15, the structure of the communication terminal 8 of this embodiment is demonstrated.

  The communication terminal 8 has the same configuration as that of FIG. 7 except that a measurement unit 81 is added to the communication terminal 5 described in FIG. 7 and the terminal control unit 50 is changed to a terminal control unit 80. Therefore, the same components as those in FIG. 7 are denoted by the same names and the same numbers, and description thereof is omitted. Differences between the second embodiment and this embodiment will be described.

  The measuring unit 81 measures a measurement target around the communication terminal 8 using a sensor included in the measuring unit 81 based on an instruction from the terminal control unit 80, and outputs the acquired measurement information to the terminal control unit 80.

  For example, the sensors included in the measuring unit 81 are a temperature sensor and a radiation intensity sensor. The information processing device 3 transmits a search request signal to the source terminal, and obtains in advance a communication path having the communication terminal 8 closest to the target point T as the destination terminal. Then, the information processing device 3 transmits a measurement request signal for requesting the destination terminal to measure the temperature and the radiation intensity to the source terminal. The source terminal that has received the measurement request signal creates a measurement signal and transmits it to the terminal control means 80 of the communication terminal 8 that is the destination terminal via the communication path.

  The terminal control unit 80 of the destination terminal that has received the measurement signal instructs the measurement unit 81 to measure the measurement target. Based on the instruction, the destination terminal measurement unit 81 measures the temperature around the destination terminal and the radiation intensity with each sensor, and outputs the acquired temperature and radiation intensity measurement values to the terminal control unit 80. The terminal control means 80 of the destination terminal creates a measurement response signal including the measurement result of each sensor of the measurement means 81 and transmits the measurement response signal back to the source terminal. Based on the content of the measurement response signal, the source terminal creates a measurement request response signal including measured values of the temperature around the destination terminal and the radiation intensity, and transmits the measurement request response signal to the information processing device 3.

  In this way, the information processing device 3 can measure the measurement target around the communication terminal 8 that is closest to the target point T via the communication network, and acquire the measurement result.

  As described above, the communication terminal 8 of the present embodiment can find the communication terminal 8 closest to the predetermined target point, as in the other embodiments. Furthermore, this embodiment can measure the measurement object around the communication terminal 8 nearest to the target point by acquiring the measurement unit 81 in the communication terminal 8, and can acquire the measurement result.

In addition, although the temperature sensor and the radiation intensity sensor have been described as examples of the sensor of the measuring unit 81 of the communication terminal 8 of the present embodiment, the sensor provided in the measuring unit 81 of the present embodiment is not limited to the one exemplified here. For example, the sensor may be an illuminance sensor, a keyboard, a touch panel, or the like.
(Sixth embodiment)
FIG. 16 is a block diagram showing a configuration example of the communication terminal 9 according to the sixth embodiment of the present invention. With reference to FIG. 16, the structure of the communication terminal 9 of this embodiment is demonstrated.

  The communication terminal 9 has the same configuration as that of FIG. 15 except that an output unit 91 and an output device 92 are added to the communication terminal 8 described in FIG. 15 and the terminal control unit 80 is changed to the terminal control unit 90. Is provided. Therefore, the same components as those in FIG. 15 are denoted by the same names and the same numbers, and the description thereof is omitted. Differences between the fifth embodiment and this embodiment will be described.

  The output unit 91 outputs an output signal from the output unit 91 based on an instruction from the terminal control unit 90 and operates the external output device 92.

  For example, it is assumed that the output device 92 is a speaker. The information processing device 3 transmits a search request signal to the source terminal, and obtains in advance a communication path having the communication terminal 9 closest to the target point T as the destination device. Then, the information processing device 3 transmits an audio reproduction request signal that requests the destination terminal to reproduce the audio signal to the source terminal. The source terminal that has received the audio reproduction request signal including the audio signal creates an audio reproduction signal including the audio signal and transmits it to the terminal control means 90 of the communication terminal 9 that is the destination terminal via the communication path. Terminal control means 90 of the destination terminal outputs an output signal including an audio signal from output means 91 to the speaker of external output device 92. As a result, the destination terminal can reproduce sound from the speaker of the output device 92.

  In this way, the information processing apparatus 3 can operate the output device 92 by outputting an output signal from the output unit 91 of the communication terminal 9 closest to the target point T via the communication network.

  If the measuring unit 81 includes a microphone, the information processing apparatus 3 acquires the ambient sound of the destination terminal using the microphone, and operates the speaker of the output device 92 from the output unit 91 to reproduce the sound. Calls can be made.

  As described above, the communication terminal 9 of this embodiment can find the communication terminal 9 closest to the predetermined target point, as in the other embodiments. Further, in the present embodiment, by providing the communication terminal 9 with the output unit 91, it is possible to operate the output device 92 by outputting an output signal from the output unit 91 of the communication terminal 9 closest to the target point. For example, a warning sound can be emitted.

  Although the communication terminal 9 according to the present embodiment has been described as including the measuring unit 81, the measuring unit 81 may not be included.

  Moreover, although the speaker has been described as an example of the output device 92 that operates in response to the output signal of the output unit 91 of the communication terminal 9 of the present embodiment, the output device 92 from which the output unit 91 of the present embodiment outputs an output signal is described. It is not limited to speakers. For example, the output device may be a lamp or a display.

  Note that the present invention is not limited to the above-described embodiments, and various modifications and changes can be made without departing from the spirit of the present invention.

  For example, the present invention can be applied to a sensor network that includes various measurement sensors in a communication terminal and collects weather information, landslide information, earthquake information, volcanic activity information, radiation information, and the like. That is, the present invention is applied to a system that designates a predetermined target point and periodically receives measurement information from a communication terminal closest to that point, or a system that temporarily lays or scatters measurement information. Applicable.

  In the present invention, the positioning means of the communication terminal may perform positioning using a positioning satellite, or perform positioning based on radio waves transmitted from a mobile radio base station or a wireless LAN access point. Also good.

  In the present invention, the identification information of the communication terminal has been described as being given a unique number in advance. However, the identification information of the communication terminal of the present invention is not limited to that given in advance. For example, the position information acquired by the positioning means 13 included in the communication terminal may be used as the identification information of the communication terminal. That is, position information is specified as identification information of the communication partner in the communication signal, and a communication terminal that matches the position information or is located within a predetermined area indicated by the position information may receive the communication signal.

  In the present invention, the communication terminal has been described as communicating wirelessly, but the wireless communication method of the communication terminal is not limited. The communication method of the communication terminal according to the present invention may be various general wireless communication including mobile communication and satellite communication. That is, the communication method of the communication terminal according to the present invention is not limited as long as it can search for the relay terminal and the destination terminal and obtain the communication path starting from the search signal transmitted from the communication terminal to each communication terminal. It is not limited.

  The communication terminal according to the present invention may be a built-in module, a mobile phone, a smartphone, a tablet terminal, a personal computer, or the like having a function of acquiring position information and a function of communicating with other communication terminals.

  Note that the processing related to the search for the relay terminal and destination terminal of the communication terminal and the acquisition of the communication path of each of the embodiments described above may be executed by software using a computer included in the communication terminal of the present invention. That is, a computer program that performs processing related to search for a relay terminal and a destination terminal and acquisition of a communication path is read and executed by a CPU (Central Processing Unit, not shown) provided in the communication terminal, whereby the relay terminal Control of processing related to the search for the destination terminal and the acquisition of the communication path may be performed. Even if the processing related to the search for the relay terminal and the destination terminal and the acquisition of the communication path is controlled using the program, the same contents as the process related to the search for the relay terminal and the destination terminal and the acquisition of the communication path of the above-described embodiment are performed. Processing can be performed. Note that the processing of the information processing that is the original function of the communication terminal and the processing of the communication function with the information processing apparatus is performed by the CPU that controls the processing related to the search for the relay terminal and the destination terminal and the acquisition of the communication path. Alternatively, it may be performed by another CPU.

  Note that the program may be stored in a non-transitory medium such as a ROM (Read Only Memory), a RAM (Random Access Memory), a semiconductor memory device such as a flash memory, an optical disk, a magnetic disk, or a magneto-optical disk.

1, 2, 4a, 4b, 5, 6, 7, 8, 9 Communication terminal 3 Information processing device 10, 40, 43, 50, 80, 90 Terminal control means 11 Terminal communication means 12 Device communication means 13 Positioning means 41 Search Transmission means 42 Search response reception means 44 Search reception means 45 Search response transmission means 81 Measurement means 91 Output means 92 Output devices 100, 200, 300, 400, 500, 600 Communication terminal system

Claims (10)

First positioning means for acquiring first terminal position information which is its own terminal position information;
First search transmission means for transmitting a first search signal including target position information designating a predetermined target point, the first terminal position information, and its own identification information;
Which of the transmission side and the reception side of the first search signal is performed on the reception side based on the second terminal position information which is terminal position information on the reception side of the first search signal is the target First search response receiving means for receiving a first search response signal transmitted from the receiving side when the receiving side is closer to the target point than the transmitting side as a result of the first perspective determination as to whether the point is near When,
When the first search response signal is received within a predetermined time after the transmission of the first search signal, the receiving side closest to the target point is determined as a target communication terminal, and within the predetermined time A first communication terminal comprising first terminal control means for determining that the first search response signal is the target communication terminal when not receiving the first search response signal;
Second positioning means for acquiring the second terminal position information;
First search receiving means for receiving the first search signal as the receiving side;
First search response transmission means for transmitting the first search response signal as the receiving side;
A second terminal control means for performing the first perspective determination as the receiving side based on the first search signal and transmitting the first search response signal according to the result of the first perspective determination; A communication terminal system comprising: a second communication terminal provided. A plurality of the second communication terminals;
The second terminal control means transmits the first search response signal including the second terminal position information and the identification information of the second communication terminal as a result of the first perspective determination,
The first terminal control means is based on the second terminal location information included in the first search response signal received within the predetermined time after transmitting the first search signal. The communication terminal system according to claim 1, wherein the second communication terminal close to the target point is determined as the target communication terminal. The first communication terminal is
Notifying that the first terminal control means has selected the second communication terminal closest to the target point as the first transmission terminal in the next communication section based on the second terminal position information, A first next path determination signal including first terminal position information, first identification information of the first communication terminal, and identification information of the second communication terminal is transmitted to the first transmission terminal. Next route confirmation transmission means,
A first route response receiving means for receiving a first route response signal for notifying route information from the first transmitting terminal;
The first terminal control means transmits the first next path determination signal to the first transmitting terminal, receives the path information included in the first path response signal,
The second communication terminal is
First next path confirmation receiving means for receiving the first next path confirmation signal;
A second search for transmitting a second search signal including the second terminal position information, the second identification information as its own identification information, and the target position information based on the first next path determination signal; A transmission means;
The second search signal transmission side and the second search signal transmission side performed on the second search signal reception side based on the third terminal position information which is the terminal position information on the reception side of the second search signal As a result of the second perspective determination as to which of the two search signal reception sides is closer to the target point, the reception side of the second search signal is closer to the target point than the transmission side of the second search signal A second search response receiving means for receiving a second search response signal transmitted from the receiving side of the second search signal,
The second search response closest to the target point based on the third terminal position information included in the second search response signal received within a predetermined time after transmitting the second search signal The second terminal location information for notifying that the signal source is selected as the second transmission terminal in the next communication section, the second identification information, and the second transmission terminal identification information. Second next route confirmation transmission means for transmitting two next route confirmation signals to the second transmission terminal;
Second route response receiving means for receiving a second route response signal for notifying route information from the second transmitting terminal;
When receiving the second route response signal, further comprising first route response transmission means for transmitting the first route response signal to the first communication terminal based on the second route response signal;
The second terminal control means transmits the second search signal based on the first next path determination signal, and is received within a predetermined time after transmitting the second search signal. Transmitting a second next route determination signal notifying that the transmission source closest to the target point is selected from the transmission source of the second search response signal to the second transmission terminal of the next communication section; When the second search response signal is not received within a predetermined time after the transmission of the second search signal, the mobile station determines that it is the target communication terminal and sends the second identification information to the target communication. When the first route response signal including route information as terminal identification information is transmitted and the second route response signal is received, the route information included in the second route response signal includes the second route response signal. Transmitting the first route response signal to which the identification information is added. Communication terminal system according to claim 1 or 2, symptoms. An information processing device that further transmits a request signal including the target position information of the target point and receives a request response signal including request response information responding to the request signal;
The first communication terminal is
Device communication means for receiving the request signal from the information processing device and transmitting the request response signal to the information processing device;
First measurement means for measuring a measurement target around the first communication terminal based on measurement request information included in the request signal, and outputting the acquired measurement information to the first terminal control means;
First measurement request transmission means for transmitting a first measurement request signal including measurement request information included in the request signal and identification information of the target communication terminal;
First measurement response receiving means for receiving a first measurement response signal including measurement information acquired by the target communication terminal based on the first measurement request signal;
First output means for outputting a first output signal to an external first output device based on output request information included in the request signal;
A first output request transmitting means for transmitting a first output request signal including output request information included in the request signal and identification information of the target communication terminal;
The first terminal control means includes:
When the first communication terminal is the target communication terminal, the measurement request response signal including the measurement information acquired from the first measurement unit based on the measurement request information is transmitted to the information processing apparatus, Outputting the first output signal to the external first output device based on output request information;
When the first communication terminal is not the target communication terminal, the first measurement request signal is transmitted, and the measurement request response signal including the measurement information included in the received first measurement response signal is transmitted. And transmitting the first output request signal,
The second communication terminal is
First measurement request receiving means for receiving the first measurement request signal;
Second measurement request transmission means for transmitting a second measurement request signal based on the first measurement request signal;
Second measurement response receiving means for receiving a second measurement response signal based on the second measurement request signal;
First measurement response transmission means for transmitting the first measurement response signal based on the second measurement response signal;
Second measurement means for measuring a measurement target around the second communication terminal based on the measurement request information included in the first measurement request signal, and outputting the acquired measurement information; and First output request receiving means for receiving an output request signal;
Second output request transmitting means for transmitting a second output request signal based on the first output request signal;
A second output means for outputting a second output signal to an external second output device based on the output request information included in the first output request signal;
The second terminal control means includes:
When the second communication terminal is the target communication terminal, the first information including the measurement information acquired from the second measurement means based on the measurement request information included in the first measurement request signal A measurement request response signal is transmitted, and the second output signal is output from the second output means to the external second output device based on the output request information included in the first output request signal. ,
When the second communication terminal is not the target communication terminal, the second measurement request signal including the measurement request information included in the first measurement request signal and the identification information of the target communication terminal is transmitted, The first measurement request response signal including the measurement information acquired by the target communication terminal included in the received second measurement response signal is transmitted, and the output included in the first output request signal The communication terminal system according to claim 3, wherein the second output request signal including request information and identification information of the target communication terminal is transmitted. The second search response receiving means includes
A function of receiving a third search response signal transmitted based on the first perspective determination;
The second terminal control means includes:
When the second search response receiving means receives the third search response signal before the first perspective determination performed by itself, the terminal location information of the source of the third search response signal and its own Based on the terminal position information, a third perspective determination is made as to which of the source of the third search response signal and itself is near the target point, and as a result of the third perspective determination, the target is the target When close to a point, the first search response signal is transmitted, and when the transmission source of the third search response signal is close to the target point, transmission of the first search response signal is stopped. The communication terminal system according to any one of claims 2 to 4. The second terminal control means includes:
Waiting for the elapse of a predetermined standby time set within the predetermined time after receiving the first search signal, or the distance between the first communication terminal and the second communication terminal The first perspective determination is performed after the standby time set by using an arbitrary monovalent function having a distance between the second communication terminal and the target point as an argument is waited for. The communication terminal system according to claim 5. The identification information is
The communication terminal according to claim 1, wherein the communication terminal is assigned based on the terminal position information acquired by the positioning unit. Positioning means for acquiring first terminal position information which is own terminal position information;
Search transmission means for transmitting a search signal including target position information designating a predetermined target point, the first terminal position information, and its own identification information;
Based on the second terminal position information which is the terminal position information on the receiving side of the search signal, the perspective on which of the transmitting side and the receiving side of the search signal is close to the target point is performed on the receiving side As a result of the determination, search response receiving means for receiving a search response signal transmitted from the receiving side when the receiving side is closer to the target point than the transmitting side;
Wherein said receiving side judges that targets the communication terminal closest to the target point when receiving the search response signal in the search signal a predetermined time from the transmission of the, the search response signal within the predetermined time period A communication terminal comprising terminal control means for determining that the terminal is the target communication terminal when not receiving. Obtain first terminal position information that is its own terminal position information,
Transmitting a search signal including target position information designating a predetermined target point, the first terminal position information, and its own identification information;
Based on the second terminal position information which is the terminal position information on the receiving side of the search signal, the perspective on which of the transmitting side and the receiving side of the search signal is close to the target point is performed on the receiving side As a result of the determination, when the receiving side is closer to the target point than the transmitting side, a search response signal transmitted from the receiving side is received,
Wherein said receiving side judges that targets the communication terminal closest to the target point when receiving the search response signal in the search signal a predetermined time from the transmission of the, the search response signal within the predetermined time period A communication control method characterized by determining that the terminal is the target communication terminal when not receiving. Positioning means for acquiring first terminal position information which is own terminal position information;
Search transmission means for transmitting a search signal including target position information designating a predetermined target point, the first terminal position information, and its own identification information;
Based on the second terminal position information which is the terminal position information on the receiving side of the search signal, the perspective on which of the transmitting side and the receiving side of the search signal is close to the target point is performed on the receiving side As a result of the determination, a computer of a communication terminal comprising search response receiving means for receiving a search response signal transmitted from the receiving side when the receiving side is closer to the target point than the transmitting side,
Wherein said receiving side judges that targets the communication terminal closest to the target point when receiving the search response signal in the search signal a predetermined time from the transmission of the, the search response signal within the predetermined time period When not receiving, a communication terminal control program which operates as a terminal control means for determining that it is the target communication terminal.

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