JP4879108B2 - Mobile terminal, ad hoc network control system, and ad hoc network control method - Google Patents

Description

  The present invention relates to a mobile terminal, a mobile terminal, an ad hoc network control system, and an ad hoc network control method.

A network that does not require infrastructure such as a base station or an access point and transmits data only by relaying between terminals such as mobile phones and personal computers is called an ad hoc network. Conventionally, a technique that considers the moving speed of a terminal in routing in an ad hoc network has been proposed. That is, using the moving speed of the terminal as a part of the metric at the time of routing determination, when selecting a route, the priority included in the route of the terminal having a high moving speed is reduced (for example, Non-patent documents 1 and 2 below).
Shinichi FURUSHO. TeruakiKITASUKA. Tsuneo NAKANISHI. Akira FUKUDA, “Node Mobility Aware Routing for Mobile Ad Hoc Network,” Vol.E87-B No.7 pp.1926-1930 IEICE W. Li, H. Murata, S. Hirose, and S. Yoshida, “Mobile ad-hocnetwork routing protocol using velocity information” SITA'99, pp.893-896, Nov.1999

  However, even if the speed of movement of the terminal is taken into consideration during routing as described above, the following problems occur. For example, when a terminal mounted on a fast moving bus or a bullet train is selected as a relay terminal, the route becomes unstable and is likely to be disconnected. Even if the terminal is not selected as a relay terminal, use of radio resources by control signals generated from these terminals having a high moving speed and a load for processing those control signals at each terminal occur.

  The present invention has been made to solve the above-described problems, and improves the communication quality of routes generated by routing in an ad hoc network, and increases unnecessary processing load and use of radio resources during routing. An object of the present invention is to provide a mobile terminal, an ad hoc network control system, and an ad hoc network control method that can be prevented.

In order to achieve the above object, a mobile terminal according to the present invention is a mobile terminal having a function constituting an ad hoc network, and includes a measuring means for measuring a moving speed of the own terminal, and a moving speed measured by the measuring means. Determining means for determining whether or not the mobile terminal exceeds a predetermined reference value, and when the moving speed exceeds the predetermined reference value by the determining means, Control means for performing control for prohibiting relaying, information acquisition means for acquiring information indicating the number of mobile terminals included in the ad hoc network including the mobile terminals, and the ad hoc network acquired by the information acquisition means this provided information indicating the number of mobile terminals, and based on a predetermined determination rule, and the reference value setting means for setting a reference value, the included The features. Further, the reference value setting means may set the reference value based on a determination rule that the reference value becomes lower as the number of mobile terminals related to the information acquired by the information acquisition means increases. Good.

In the mobile terminal according to the present invention, when the moving speed exceeds a predetermined reference value, data relay for the ad hoc network is prohibited. As a result, in an ad hoc network including mobile terminals according to the present invention, a route including a mobile terminal moving at a moving speed exceeding a predetermined reference value is not formed, and the communication quality of the route is improved. improves. In addition, since the control signal is not relayed by the mobile terminal according to the present invention that is not selected as a route, it is possible to prevent an unnecessary increase in processing load and use of radio resources due to the control signal during routing. it can. Also, according to this configuration, the route routed in the ad hoc network can be set to an appropriate communication quality according to the number of mobile terminals (nodes) (node density) in the ad hoc network.

  The control means preferably performs control to prohibit sending data from the own terminal to the ad hoc network when the determination means determines that the moving speed exceeds a predetermined reference value. According to this configuration, since data is not transmitted from a mobile terminal whose moving speed exceeds a predetermined reference value, the communication quality of a route generated by routing in an ad hoc network is further improved, and routing is performed. In this case, it is possible to further prevent an unnecessary increase in processing load and use of radio resources.

The information acquisition means also acquires information indicating the amount of traffic generated per hour and the communication time in an ad hoc network including a mobile terminal , and the information acquisition means for acquiring the information and the reference value setting means include information acquisition also based on the information indicating the occurrence amount and communication time traffic per acquired time by means sets the reference value, it is desirable. According to this configuration, the route routed in the ad hoc network can be set to an appropriate communication quality corresponding to the traffic.

The information acquisition means also acquires information indicating the movement speed of a mobile terminal different from the own terminal included in the ad hoc network configured to include the mobile terminal, and the reference value setting means is the separate information acquired by the information acquisition means. also based on the information indicating the moving speed of the mobile terminal, it sets the reference value, it is desirable. According to this configuration, the route routed in the ad hoc network can be set to appropriate communication quality according to the mobility (mobility) of the mobile terminal.

The information acquisition means also acquires information indicating the required quality of communication in a mobile terminal different from the own terminal included in the ad hoc network configured to include the mobile terminal , and the reference value setting means is acquired by the information acquisition means. and another based also on the information indicating the requested quality of the communication in the mobile terminal, sets the reference value, it is desirable. According to this configuration, the route routed in the ad hoc network can be set to an appropriate communication quality corresponding to the required communication quality.

The control means determines whether or not the terminal is relaying data for the ad hoc network when performing control to prohibit the relay of data, and when determining that the relay is relaying, the determination It is desirable to perform control to continue relaying only the data related to and prohibit relaying other data . According to this configuration, it is possible to prevent the route search processing (reroute processing) in the mobile terminal included in the ad hoc network from being triggered by the control for prohibiting data relay.

In order to achieve the above object, an ad hoc network control system according to the present invention includes an ad hoc network control device included in a communication network, and a mobile terminal having a function of configuring the ad hoc network and a function of connecting to the communication network. A configured ad hoc network control system comprising measuring means for measuring the moving speed of a mobile terminal, wherein the ad hoc network control device determines whether or not the moving speed measured by the measuring means exceeds a predetermined reference value. When the moving speed exceeds the predetermined reference value by the determining means and the determining means, the data relay for the ad hoc network is relayed to the mobile terminal related to the measurement of the moving speed. transmitting means for transmitting a control signal for prohibiting ad hoc network configured to include a mobile terminal Based on information acquisition means for acquiring information indicating the number of mobile terminals included in the network, information indicating the number of mobile terminals included in the ad hoc network acquired by the information acquisition means, and a predetermined decision rule A reference value setting means for setting a reference value, wherein the mobile terminal receives a control signal transmitted from the ad hoc network control device, and based on the control signal received by the receiving means, Control means for performing control for prohibiting data relaying.

  In the ad hoc network control system according to the present invention, data relay for an ad hoc network is prohibited in a mobile terminal whose moving speed exceeds a predetermined reference value. Thereby, in an ad hoc network controlled by the ad hoc network control system according to the present invention, a route including a mobile terminal moving at a moving speed exceeding a predetermined reference value is not formed, and the communication quality of the route is improved. improves. In addition, since a control signal is not relayed by a mobile terminal that is not selected as a route, it is possible to prevent an unnecessary increase in processing load and use of radio resources due to the control signal during routing.

  It is desirable that the ad hoc network control device further includes a measurement unit. According to this configuration, the present invention can be easily implemented.

When the transmission means transmits a control signal prohibiting data relay, the mobile terminal determines whether or not the mobile terminal relays data for the ad hoc network, and determines that the relay is relaying, It is desirable that only the data relay related to the determination is continued and a control signal for prohibiting the relay of other data is transmitted. According to this configuration, it is possible to prevent the route search processing (reroute processing) in the mobile terminal included in the ad hoc network from being triggered by the control for prohibiting data relay.

  By the way, the present invention can be described as an invention of a mobile terminal and an ad hoc network control system as described above, as well as an invention of an ad hoc network control method as follows. This is substantially the same invention only in different categories, and has the same operations and effects.

An ad hoc network control method according to the present invention is an ad hoc network control method in a mobile terminal having a function of constituting an ad hoc network, and includes a measurement step for measuring a movement speed of the own terminal, and a movement speed measured in the measurement step. A determination step for determining whether or not a predetermined reference value is exceeded, and if it is determined in the determination step that the moving speed exceeds a predetermined reference value, the data of the ad hoc network for Included in the control step for performing control to prohibit relay, the information acquisition step for acquiring information indicating the number of mobile terminals included in the ad hoc network including the mobile terminal, and the ad hoc network acquired in the information acquisition step Information indicating the number of mobile terminals to be Based on the decision rule, characterized by comprising a reference value setting step of setting a reference value.

An ad hoc network control method according to the present invention is an ad hoc network control system including an ad hoc network control device included in a communication network, and a mobile terminal having a function of configuring the ad hoc network and a function of connecting to the communication network. An ad hoc network control step including a measurement step of measuring a moving speed of the mobile terminal, wherein the ad hoc network control device determines whether or not the moving speed measured in the measuring step exceeds a predetermined reference value; In the determination step, when it is determined in the determination step that the moving speed exceeds a predetermined reference value, control for prohibiting relaying data for the ad hoc network to the mobile terminal related to the measurement of the moving speed a transmission step of transmitting a signal, the mobile terminal An information acquisition step for acquiring information indicating the number of mobile terminals included in an ad hoc network configured to include information indicating the number of mobile terminals included in the ad hoc network acquired in the information acquisition step, and a predetermined number Based on the determination rule, a reference value setting step for setting a reference value , a receiving step in which the mobile terminal receives a control signal transmitted from the ad hoc network control device, and a control signal received in the receiving step, And a control step for performing control for prohibiting data relay for the ad hoc network.

  According to the present invention, data relay for an ad hoc network is prohibited in a mobile terminal whose moving speed exceeds a predetermined reference value. Thereby, in the ad hoc network, a route including a mobile terminal moving at a moving speed exceeding a predetermined reference value is not formed, and the communication quality of the route is improved. In addition, since a control signal is not relayed by a mobile terminal that is not selected as a route, it is possible to prevent an unnecessary increase in processing load and use of radio resources due to the control signal during routing.

  Hereinafter, various preferred embodiments of a mobile terminal, an ad hoc network control system, and an ad hoc network control method according to the present invention will be described in detail with reference to the drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and redundant description is omitted.

[First Embodiment]
FIG. 1 shows a configuration of a mobile terminal 10 according to the present embodiment and an ad hoc network N1 including a plurality of the mobile terminals 10. The ad hoc network N1 is a network that includes a plurality of mobile terminals 10 having a data relay function, and can transmit data to a desired terminal by repeating data relay between the mobile terminals. The mobile terminal 10 constituting the ad hoc network N1 has the functions described below in order to constitute the ad hoc network N1.

  The mobile terminal 10 transmits / receives a control signal to / from another terminal configuring the ad hoc network N1, and relays the signal as necessary. This control signal is configured as a packet and includes data necessary for routing when data is transmitted in the ad hoc network N1. Further, when transmitting a packet as data to be transmitted / received between terminals, the mobile terminal 10 performs routing based on the received control signal and transmits the packet to a desired terminal through a route formed by the routing. In addition, when the mobile terminal 10 is included in a route formed by another terminal, the mobile terminal 10 receives a control signal indicating that from the other terminal and responds to the route based on the control signal. A connection is established with another terminal to relay data.

  Specifically, for example, a mobile terminal such as a mobile phone can be used as the mobile terminal 10. A terminal mounted on a mobile vehicle such as an automobile may be used. When the mobile terminal 10 is mounted on an automobile, the amount of power supplied to the mobile terminal 10 is abundant, so that the power saving problem, which is one of the major problems of the ad hoc network, is solved.

  Subsequently, the functional configuration of the mobile terminal 10 will be described. As shown in FIG. 1, the mobile terminal 10 includes an ad hoc network function unit 11, a measurement unit 12, a determination unit 13, a control unit 14, an information acquisition unit 15, and a reference value setting unit 16. Is done.

  The ad hoc network function unit 11 is a means that bears the function of configuring the ad hoc network N1. As described above, the function that configures the ad hoc network N1 is a function (routing function) that performs processing related to routing for relaying data including a control signal to another terminal or establishing a connection. is there. The ad hoc network function unit 11 also performs transmission / reception of data of the terminal 10 itself (not related to relaying). The data of the own terminal 10 itself is configured as a packet when transmitted / received, and is used in, for example, an application program that operates on the mobile terminal 10 and is input / output from / to the application program.

  The measuring unit 12 is a measuring unit that measures the moving speed of the terminal 10 itself. The moving speed is measured based on, for example, a time change of the position of the terminal 10 measured by GPS (Global Positioning System). Moreover, you may measure using the speed sensor comprised by a piezoelectric element etc. In the case where the mobile terminal 10 is mounted on a car, speed information may be acquired from the speedometer of the car. The movement speed measurement by the measurement unit 12 may be performed constantly, for example, or may be performed periodically every few seconds. The measurement unit 12 outputs information on the moving speed of the terminal 10 to the determination unit 13 in a format such as a speed per hour.

  The determination unit 13 is a determination unit that determines whether or not the moving speed measured by the measurement unit 12 exceeds a predetermined reference value. In the ad hoc network N1, as the moving speed of the mobile terminal 10 increases, the connection related to the mobile terminal 10 becomes unstable and easily disconnected. The determination in the determination unit 13 is a determination as to whether or not the own terminal 10 can be an unstable node in the ad hoc network N1.

  Therefore, it is preferable that the predetermined reference value to be compared with the moving speed of the terminal 10 is in accordance with the above purpose. For example, if it is up to the speed of a pedestrian, the reference value is set to 4 km / h assuming that it is almost in a stopped state and is included in the routing target. Moreover, when the aspect where the distance between terminals becomes long is considered, it may be set to 1 km / h per hour in consideration of the influence of the speed of walking. Conversely, when the communication speed is high or the amount of data is small, a larger value such as 20 km / h, which is about a bicycle movement, may be used.

  This reference value is held in the memory or the like of the mobile terminal 10 and may be set as a fixed value in the determination unit 13 in advance. As will be described later, the reference value setting unit 16 determines the state of the ad hoc network N1 and the like. It may be set according to. The determination result by the determination unit 13 is notified to the control unit 14.

  The control unit 14 is a control unit that controls the ad hoc network function unit 11 to stop the function when the determination unit 13 determines that the moving speed exceeds a predetermined reference value. Specifically, the control unit 14 controls the ad hoc network function unit 11 to prohibit relaying data for the ad hoc network N1, that is, prohibiting relaying data as a node of the ad hoc network N1. Data for which relaying is prohibited includes control signals and data to be transmitted / received between terminals. When this control is received, the ad hoc network function unit 11 does not transmit to the relay destination even if it receives data to be relayed. Moreover, you may make it not receive all the data transmitted with respect to the own terminal 10. FIG. This control is for removing unstable nodes from the ad hoc network N1.

  Further, it is preferable that the control unit 14 not only relays data but also prohibits the ad hoc network function unit 11 from transmitting data of the terminal 10 itself (not related to relaying). As described above, the data that is prohibited from being sent includes a control signal and a packet to be transmitted / received between terminals.

  In addition, the control unit 14 has already performed control for prohibiting data relaying to the ad hoc network function unit 11, and the determination unit 13 determines that the moving speed of the mobile terminal 10 does not exceed a predetermined reference value. In this case, the ad hoc network function unit 11 is controlled to resume data relay for the ad hoc network N1. This control is for returning a node that has become unstable to the ad hoc network N1.

  The information acquisition unit 15 is information acquisition means for acquiring information for setting a reference value for determination in the determination unit 13. Specifically, what information is acquired and how will be described later. The acquired information is output to the reference value setting unit 16. Acquisition of information by the information acquisition unit 15 is performed periodically, for example.

  The reference value setting unit 16 is a reference value setting unit that sets a reference value for determination in the determination unit 13 based on the information acquired by the information acquisition unit 15. The reference value can be appropriately set by the reference value setting unit 16 according to the state of the ad hoc network N1 and the like. Specifically, what reference value is set based on what information will be described later. The functional configuration of the mobile terminal 10 has been described above.

  FIG. 2 shows a hardware configuration of the mobile terminal 10. As shown in FIG. 2, a mobile terminal 10 includes a CPU (Central Processing Unit) 101, a RAM (Random Access Memory) 102, a ROM (Read Only Memory) 103, an operation unit 104, a wireless communication unit 105, a display 106, an antenna 107, and the like. It is composed of hardware. By operating these components, the functions of the mobile terminal 10 described above are exhibited.

  Subsequently, processing (ad hoc network control method) executed by the mobile terminal 10 according to the present embodiment will be described using the flowchart of FIG. This process is a process when the mobile terminal 10 forms the ad hoc network N1. Since the mobile terminal 10 constitutes the ad hoc network N1, the ad hoc network function unit 11 relays data with another terminal constituting the ad hoc network N1.

  First, in the mobile terminal 10, the moving speed of the own terminal 10 is measured by the measuring unit 12 (S01, measurement step). Information indicating the measured moving speed is output to the determination unit 13. The determination unit 13 receives the information and determines whether the moving speed exceeds the reference value (S02, determination step). The determination result is notified from the determination unit 13 to the control unit 14.

  The control unit 14 refers to the determination result, and performs the following processing when the moving speed exceeds the reference value. When the routing function of the ad hoc network function unit 11 is operating, the control unit 14 controls the ad hoc network function unit 11 to stop the routing function (S03, S04, control step). Specifically, the relay of data including a control signal for the ad hoc network N1 is prohibited. Furthermore, it is preferable that not only relaying but also transmission / reception of data of the mobile terminal 10 itself is prohibited. By this control, the mobile terminal 10 enters a state where transmission / reception of all data (packets) is not permitted. This is because the moving speed exceeds the reference value and the mobile terminal 10 may become an unstable node in the ad hoc network N1.

  Thereby, in the ad hoc network N1, the relay and transmission / reception of the data concerning the mobile terminal 10 are not performed. Therefore, even when data is transmitted from another terminal to the mobile terminal 10, the mobile terminal 10 does not perform processing such as relaying on the data, and the data is discarded. When the mobile terminal 10 whose routing function is stopped has already formed a route in the ad hoc network N1, the route is disconnected. When the route is disconnected, the route disconnection is recognized by a terminal adjacent to the mobile terminal 10 in the route, and the reroute process is performed. Rerouting is usually done as described in T. Clausen, P. Jacquet, A. Laouiti, P. Muhlethaler, a. Qayyum et L. Viennot, “OptimizedLink State Routing Protocol”, IEEE INMIC Pakistan 2001. It is realized by the routing technology.

  On the other hand, when the above control is performed from the control unit 14 to the ad hoc network function unit 11 and the routing function of the ad hoc network function unit 11 is not operating, the control unit 14 transfers to the ad hoc network function unit 11. No particular control is performed, and the process ends (S03, control step).

  In the control unit 14, the determination result by the determination unit 13 is referred to, and when the moving speed does not exceed the reference value, the following processing is performed. When the routing function of the ad hoc network function unit 11 is operating, control from the control unit 14 to the ad hoc network function unit 11 is not particularly performed, and the process ends (S05, control step). This is because the moving speed does not exceed the reference value, and there is no possibility that the mobile terminal 10 becomes an unstable node in the ad hoc network N1, so it is not necessary to stop the function.

  On the other hand, when the above control is performed from the control unit 14 to the ad hoc network function unit 11 and the routing function of the ad hoc network function unit 11 is not operating, the control unit 14 changes to the ad hoc network function unit 11. On the other hand, control for resuming the routing function is performed (S05, S06, control step). This is because the mobile terminal 10 does not exceed the reference value, so there is no possibility that the mobile terminal 10 becomes an unstable node in the ad hoc network N1, and thus it is not necessary to stop the function.

  As described above, in the present embodiment, in the mobile terminal 10, data relay for the ad hoc network N1 is prohibited when the moving speed exceeds a predetermined reference value. Thereby, in the ad hoc network N1 configured to include the mobile terminal 10 according to the present embodiment, a route including the mobile terminal 10 moving at a moving speed exceeding a predetermined reference value is not formed, and the route Communication quality is improved. In addition, since the control signal is not relayed by the mobile terminal 10 that is not selected as a route, it is possible to prevent an unnecessary increase in processing load and use of radio resources due to the control signal at the time of routing.

  Further, as in the present embodiment, if the sending of data from the mobile terminal 10 itself is further prohibited, the sending of data from the mobile terminal 10 whose moving speed exceeds a predetermined reference value will not be performed. . Therefore, it is possible to further improve the communication quality of routes generated by routing in an ad hoc network, and to further prevent unnecessary processing load increase and use of radio resources during routing.

  By the way, the reference value of the comparison target of the moving speed in the comparison in the determination unit 13 may be set as appropriate. Information for setting the reference value is acquired by the information acquisition unit 15, and the reference value is set by the reference value setting unit 16 based on the information. Specifically, it is performed as follows.

  For example, the reference value is set based on information indicating traffic in the ad hoc network N1. The information acquisition unit 15 acquires information indicating traffic in the ad hoc network N1. The information indicating the traffic used here is, for example, the amount of traffic generated per hour (number of sessions) and communication time (average value) in the ad hoc network N1. These pieces of information are information indicating the traffic model of the ad hoc network N1. These pieces of information are calculated from, for example, the actual traffic of the terminal 10 and the traffic being transferred. Further, for example, information on the amount of data transmitted / received from another terminal may be received and calculated from the information. The information acquisition unit 15 notifies the reference value setting unit 16 of information indicating the amount of traffic generated per hour and the communication time.

  In the reference value setting unit 16, the reference value is determined based on the information notified from the information acquisition unit 15. Specifically, for example, a predetermined threshold value is stored in the reference value setting unit 16, and the amount of traffic generated per hour (number of sessions) and the average value of communication time are determined based on whether the threshold value is equal to or higher than the threshold value. These are determined from reference values that are held in advance.

  The rule for determining the reference value is determined in consideration of the following points. In a traffic model in which traffic with a short communication time occupies a large number, even if a terminal moving at high speed is selected as a route, the probability of disconnection during communication is low, so the reference value should be (relatively) high. May be. On the other hand, if the communication time is long, the probability of disconnection during communication increases, so it is effective to lower the reference value.

  The reference value determined by the reference value setting unit 16 is set as a reference value used for determination in the determination unit 13. With this configuration, the route routed in the ad hoc network N1 can be set to an appropriate communication quality according to the traffic.

  The reference value is set based on, for example, information indicating the moving speed of the mobile terminal included in the ad hoc network N1. The mobile terminal here includes not only the terminal 10 itself but also terminals other than the terminal 10 itself. The information acquisition unit 15 acquires information indicating the moving speed of the mobile terminal included in the ad hoc network N1. Specifically, the information indicating the moving speed of the mobile terminal used here is, for example, the moving speed (average value) of the mobile terminals included in the ad hoc network N1. This information is information indicating the mobility model of the terminal of the ad hoc network N1. For example, these pieces of information are calculated from information received from another terminal by receiving information on the moving speed of the terminal. Information may be acquired by the following method. The mobility model of the terminal 10 can be grasped from the measurement results by the measurement unit 12. The mobility model of another terminal is derived based on the route disconnection rate measured by the terminal 10 itself. For example, it can be derived as a mobility model with a lot of movement if it is cut well, or as a mobility model with little movement if it is not cut off. The information acquisition unit 15 notifies the reference value setting unit 16 of information indicating the mobility model.

  In the reference value setting unit 16, the reference value is determined based on the information notified from the information acquisition unit 15. Specifically, for example, a predetermined threshold value is stored in the reference value setting unit 16 and is stored in advance depending on whether the mobility model (average value of the moving speed of the mobile terminal) is greater than or less than the threshold value. It is determined from the standard value.

  The rule for determining the reference value is determined in consideration of the following points. When only the terminals moving at high speed, if the reference value is lowered, the route will not be established. On the other hand, when a large number of terminals are moving at low speed, a higher quality route can be set by lowering the reference value.

  The reference value determined by the reference value setting unit 16 is set as a reference value used for determination in the determination unit 13. With this configuration, the route routed in the ad hoc network N1 can be set to an appropriate communication quality according to the mobility (mobility) of the mobile terminal.

  The reference value is set based on, for example, information indicating the required quality of communication in the mobile terminal included in the ad hoc network N1. The mobile terminal here includes not only the terminal 10 itself but also terminals other than the terminal 10 itself. The information acquisition unit 15 acquires information indicating the required quality of communication in the mobile terminal included in the ad hoc network N1. The information indicating the required quality of communication used here is specifically, for example, “whether or not communication quality may be disconnected” set in advance in each terminal included in the ad hoc network N1. Information. These pieces of information are acquired by receiving the set information from another terminal, for example. Information may be acquired by the following method. The information acquisition unit 15 notifies the reference value setting unit 16 of information indicating the required quality of communication.

  In the reference value setting unit 16, the reference value is determined based on the information notified from the information acquisition unit 15. Specifically, for example, a predetermined threshold value is stored in the reference value setting unit 16 and is stored in advance depending on whether the number of terminals set to be disconnected is greater than or less than the threshold value. Determine from the standard value.

  The rule for determining the reference value is determined in consideration of the following points. If there are a large number of terminals that are set to be disconnected regardless of the quality, the ratio of route establishment can be increased by setting the reference value low. On the other hand, if there are a large number of terminals that require high-quality communication, increasing the reference value decreases the rate of route establishment, but it is possible to improve the quality of the established route.

  The reference value determined by the reference value setting unit 16 is set as a reference value used for determination in the determination unit 13. With this configuration, the route routed in the ad hoc network N1 can be set to an appropriate communication quality corresponding to the required communication quality.

  The reference value is set based on, for example, information indicating the number of mobile terminals (node density) included in the ad hoc network N1. The information acquisition unit 15 acquires information indicating the number of mobile terminals included in the ad hoc network N1. Note that the number of mobile terminals included in the ad hoc network N1 is normally recognized as long as the mobile terminal is connected to the ad hoc network N1. The information acquisition unit 15 notifies the reference value setting unit 16 of information indicating the number of mobile terminals included in the ad hoc network N1.

  In the reference value setting unit 16, the reference value is determined based on the information notified from the information acquisition unit 15. Specifically, for example, a predetermined threshold value is stored in the reference value setting unit 16 and is stored in advance depending on whether the number of mobile terminals included in the ad hoc network N1 is greater than or less than the threshold value. Determine from the reference value.

  The rule for determining the reference value is determined in consideration of the following points. When the node density is high, by setting the reference value low, a large number of terminals that operate the routing function can be secured, so that a high route establishment ratio can be secured. On the other hand, when the node density is low, the number of terminals on which the routing function operates decreases, resulting in a low route establishment rate.

  The reference value determined by the reference value setting unit 16 is set as a reference value used for determination in the determination unit 13. With such a configuration, the route routed in the ad hoc network N1 can have an appropriate communication quality according to the number (node density) of terminals (nodes) in the ad hoc network.

[Second Embodiment]
In the above-described embodiment, control is performed by the mobile terminal 10 constituting the ad hoc network N1. However, when the mobile terminal 10 constituting the ad hoc network N1 can be connected to a communication network different from the ad hoc network N1, As described in the embodiment, control may be performed by an ad hoc network control device included in the communication network.

  FIG. 4 shows an ad hoc network control system 1 according to the present embodiment. As shown in FIG. 4, the ad hoc network control system 1 includes an ad hoc network control device 20 included in the mobile communication network N2, and a mobile terminal 30 having a function of configuring the ad hoc network N1 and a function of connecting to the mobile communication network N2. It is comprised including. The ad hoc network N1 is the same as that described in the first embodiment. Specifically, as the mobile terminal 30, for example, a portable terminal such as a mobile phone or a terminal mounted on a mobile vehicle such as an automobile is used as described in the first embodiment.

  The mobile communication network N2 is a communication network that provides a mobile communication service to the mobile terminal 30 connected to its own network. The mobile communication network N2 is realized by devices such as a base station and an exchange. The ad hoc network control device 20 is a device that controls the ad hoc network N1. The ad hoc network control device 20 can transmit / receive information to / from the mobile terminal 30 when the mobile terminal 30 configuring the ad hoc network N1 is connected to the mobile communication network N2. The ad hoc network control device 20 can be realized, for example, by including a function as the ad hoc network control device 20 described later in a radio control device or the like in the mobile communication network N2. In this embodiment, the communication network is the mobile communication network N2. However, the communication network is not necessarily a mobile communication network, and may be any communication network to which the mobile terminal 30 can be connected.

  Subsequently, configurations of the ad hoc network control device 20 and the mobile terminal 10 will be described. As illustrated in FIG. 4, the ad hoc network control device 20 includes a measurement unit 21, a determination unit 22, and a transmission unit 23.

  The measuring unit 21 is a measuring unit that measures the moving speed of each mobile terminal 30. The movement speed is measured by the following method, for example. The mobile communication network N2 knows to which base station the mobile terminal 30 is performing location registration. The measurement unit 21 acquires time-series information indicating which base station the mobile terminal 30 is performing location registration, and the moving speed of the mobile terminal 30 from the information and information on the distance between the base stations. Is calculated. For example, if the base station where the mobile terminal 30 has registered the location of the base station A → B → C changes in 10 minutes, and the distance between the base stations A and C is 5 km, the moving speed is 500 m / Calculated as minutes. Information on the distance between the base stations is held in advance by the measurement unit 21.

  Further, since the radio wave transmitted and received between the mobile terminal 30 and the base station has an intensity corresponding to the distance from the base station, information on the change in the intensity of the radio wave received by the base station is acquired, and the radio field intensity is obtained. The moving speed may be calculated by obtaining the moving distance from the change. As the information on the radio wave intensity, for example, information such as received power, received electric field intensity, S / N ratio (Signal to Noise Ratio), C / N ratio (Carrier to Noise Ratio) can be used. For example, “digital mobile communication” (supervised by Koji Kuwabara, Science Newspaper Company, 1992) is that the radio waves transmitted and received between the mobile terminal 30 and the base station have an intensity corresponding to the distance from the base station. It is described in. Alternatively, the moving speed may be calculated from the fading pitch (cycle) of radio waves. The measuring unit 21 outputs information on the moving speed of the mobile terminal 30 to the determining unit 22 in a format such as a speed per hour.

  Note that the measuring unit 21 does not necessarily need to measure the moving speed of the mobile terminal 30 as described above, and the mobile terminal 30 measures the moving speed of the own terminal 30 by the method described in the first embodiment. And it is good also as receiving the information of the measured moving speed from the mobile terminal 30. FIG.

  The determination unit 22 is a determination unit that determines whether or not the movement speed of the mobile terminal 30 measured by the measurement unit 21 exceeds a predetermined reference value. This corresponds to the determination unit 13 in the first embodiment. The reference value is held in a memory or the like of the ad hoc network control device 20. Further, the reference value may be set as a fixed value in the determination unit 22 in advance, or may be set according to the state of the ad hoc network N1 by the reference value setting unit as described in the first embodiment. May be. When the reference value is set by the reference value setting unit, information for setting the reference value is acquired from the mobile terminal 30 or the like as necessary. The determination result by the determination unit 22 is notified to the transmission unit 23.

  The transmission unit 23 controls the mobile terminal 30 to prohibit data relay for the ad hoc network N1 when the determination unit 22 determines that the moving speed of the mobile terminal 30 exceeds a predetermined reference value. It is a transmission means which transmits a signal. Moreover, it is preferable that the transmission unit 23 not only relays data but also transmits a control signal for prohibiting transmission of data from the own terminal 30 to the mobile terminal 30.

  Further, the transmission unit 23 has already transmitted a control signal to the mobile terminal 30, and does not transmit the control signal when the mobile terminal 30 is controlled to prohibit data relay. The transmission unit 23 has already transmitted a control signal to the mobile terminal 30 and data relay is prohibited in the mobile terminal 30, and the moving speed of the mobile terminal 30 is determined by the determination unit 22 to a predetermined reference value. When it is determined that it does not exceed, a control signal for restarting data relay for the ad hoc network N1 is transmitted to the mobile terminal 30.

  In the ad hoc network control device 20, the movement speed measurement by the measurement unit 21, the determination by the determination unit 22, and the transmission by the transmission unit 23 are performed for each mobile terminal 30. Accordingly, the information regarding the moving speed and the like is managed for each mobile terminal 30 in the ad hoc network control device 20.

  As shown in FIG. 5, the ad hoc network control device 20 (a wireless control device or the like constituting the ad hoc network) includes a CPU 201, a RAM 202 and a ROM 203 that are main storage devices, a communication module 204 that is a data transmission / reception device such as a network card, a hard disk, and the like. The computer is provided with hardware such as the auxiliary storage device 205. By operating these components, the above-described functions of the ad hoc network control apparatus 20 are exhibited. The above is the configuration of the ad hoc network control device 20.

  As shown in FIG. 4, the mobile terminal 30 includes an ad hoc network function unit 31, a reception unit 32, and a control unit 33. The ad hoc network function unit 31 is a unit having a function of configuring the ad hoc network N1. It has the same function as the ad hoc network function unit 11 in the first embodiment.

  The receiving unit 32 is a receiving unit that receives a control signal that is transmitted from the ad hoc network control device 20 and prohibits relaying of data for the ad hoc network N1. Transmission and reception of control signals are performed via the mobile communication network N2. The received control signal is output to the control unit 33.

  The control unit 33 is a control unit that controls the ad hoc network function unit 31 to stop the function based on the control signal received by the reception unit 32. Specifically, the control unit 33 controls the ad hoc network function unit 31 to prohibit relaying data for the ad hoc network N1, that is, prohibiting relaying data as a node of the ad hoc network N1. The data prohibited from being relayed includes a control signal and a packet to be transmitted / received between terminals. Upon receiving this control, the ad hoc network function unit 31 does not transmit data to the relay destination even if it receives data to be relayed. Moreover, you may make it not receive all the data transmitted with respect to the own terminal 30. FIG.

  In addition, the control unit 33 receives the control signal received by the receiving unit 32 not only for data relay but also for the ad hoc network function unit 31 (not related to relay). Such control is also performed when the transmission is prohibited. The data prohibited from being sent includes the control signal and data to be transmitted / received between terminals, as described above.

  The functional configuration of the mobile terminal 30 has been described above. The hardware configuration of the mobile terminal 30 is the same as that of the mobile terminal 10 in the first embodiment.

  Subsequently, processing (ad hoc network control method) executed in the ad hoc network control system 1 according to the present embodiment will be described with reference to the sequence diagram of FIG. This process is a process when the ad hoc network N1 is configured by a plurality of mobile terminals 30. Here, processing of a specific mobile terminal 30 and the ad hoc network control device 20 will be described.

  Since the mobile terminal 30 constitutes the ad hoc network N1, when data is transmitted from another terminal constituting the ad hoc network N1 (S11), routing processing such as data relay is performed by the ad hoc network function unit 31. Performed (S12). Here, the data transmitted to the mobile terminal 30 includes a control signal to be relayed for the ad hoc network N1. Here, it is assumed that the mobile terminal 30 moves (high speed) at a moving speed that exceeds a reference value in the determination unit 22 of the ad hoc network control device 20.

  In the ad hoc network control device 20, the moving speed of the mobile terminal 30 is measured by the measuring unit 21 (S13, measuring step). Information indicating the measured moving speed is output to the determination unit 22. The determination unit 22 receives the information and determines whether or not the moving speed exceeds the reference value (S14, determination step). The determination result is notified from the determination unit 22 to the transmission unit 23.

  In the transmission unit 23, the determination result is referred to. Here, since the moving speed exceeds the reference value, a control signal for stopping the routing function is transmitted from the transmission unit 23 to the mobile terminal 30 (S15, transmission step). If the moving speed does not exceed the reference value, no control signal is transmitted.

  In the mobile terminal 30 to which the control signal is transmitted from the ad hoc network control device 20, the control signal is received by the reception unit 32 (S15, reception step). The control signal is output from the receiving unit 32 to the control unit 33. Based on this control signal, the control unit 33 controls the ad hoc network function unit 31 to stop the routing function (S16, control step). Specifically, the relay of data including a control signal for the ad hoc network N1 is prohibited. Furthermore, when the control signal prohibits not only data relay but also transmission / reception of data of the mobile terminal 30 itself, such control is also performed. By this control, the mobile terminal 30 enters a state where transmission / reception of no data (packets) is permitted. This is because the moving speed exceeds the reference value and the mobile terminal 30 may become an unstable node in the ad hoc network N1.

  Thereby, in the ad hoc network N1, the relay and transmission / reception of the data concerning the mobile terminal 30 are not performed. Therefore, even if data is transmitted from another terminal to the mobile terminal 30 (S17), the mobile terminal 30 does not perform processing such as relaying on the data, and the data is discarded. When the mobile terminal 10 whose routing has been stopped has already formed a route in the ad hoc network N1, the route is disconnected as described above, and reroute processing is performed between other terminals as necessary. .

  Here, it is assumed that the mobile terminal 30 moves (low speed) at a moving speed that does not exceed the reference value in the determination unit 22 of the ad hoc network control device 20. In the ad hoc network control device 20, the measurement unit 21 measures the moving speed of the mobile terminal 30 (S18, measurement step). Information indicating the measured moving speed is output to the determination unit 22. The determination unit 22 receives the information and determines whether the moving speed exceeds the reference value (S19, determination step). The determination result is notified from the determination unit 22 to the transmission unit 23.

  In the transmission unit 23, the determination result is referred to. Here, since the movement speed does not exceed the reference value, a control signal for resuming the routing function is transmitted from the transmission unit 23 to the mobile terminal 30 (S20, transmission step). When the moving speed exceeds the reference value, the control signal is not transmitted.

  In the mobile terminal 30 to which the control signal is transmitted from the ad hoc network control device 20, the reception unit 32 receives the control signal (S20, reception step). The control signal is output from the receiving unit 32 to the control unit 33. Based on this control signal, the control unit 33 controls the ad hoc network function unit 31 to resume the routing function (S21, control step). Specifically, relaying of data including a control signal and transmission / reception of data of the mobile terminal 30 itself for the ad hoc network N1 are resumed. This is because the mobile terminal 10 does not exceed the reference value, so there is no possibility that the mobile terminal 10 becomes an unstable node in the ad hoc network N1, and thus it is not necessary to stop the function.

  Since the routing function has been resumed, the mobile terminal 30 performs routing processing such as data relaying by the ad hoc network function unit 31 when data is transmitted from another terminal constituting the ad hoc network N1 (S22). (S23).

  As described above, according to the present embodiment, even if the routing function is controlled by the ad hoc network control device 20, the mobile terminal 10 moving at a moving speed exceeding a predetermined reference value in the ad hoc network N1. The route including the route is not formed, and the communication quality of the route is improved. In addition, since the control signal is not relayed by the mobile terminal 10 that is not selected as a route, it is possible to prevent an unnecessary increase in processing load and use of radio resources due to the control signal at the time of routing.

  Furthermore, according to this embodiment, since it is not necessary to perform processing such as comparison with the reference value of the moving speed in the mobile terminal 30, the addition from the conventional function in the mobile terminal 30 can be reduced. The invention can be easily carried out.

  Further, if the moving speed of the mobile terminal 30 is measured in the ad hoc network control device 20 as in the present embodiment, it is not necessary to perform the measurement in the mobile terminal 30, so that the present invention is more easily implemented. be able to.

  In the present embodiment, the mobile terminals 30 to be controlled in the ad hoc network control device 20 do not have to be all mobile terminals constituting the ad hoc network N1, and only some mobile terminals may be controlled. .

[Third Embodiment]
In the two embodiments described above, when the moving speed of the mobile terminals 10 and 30 exceeds a predetermined reference value, the mobile terminals 10 and 30 are uniformly prohibited from relaying data for the ad hoc network N1. I was doing control. When the prohibition of data relay is controlled, the mobile terminals 10 and 30 to be controlled exist in a range where radio waves can be transmitted and received with other mobile terminals, and the relay operation can be continuously performed. However, the routing operation is stopped and the relay operation is terminated. As a result, in the ad hoc network N1, there is a risk of inducing route search processing in a mobile terminal that has transmitted data using a route including the mobile terminals 10 and 30 to be controlled. In the present embodiment, a configuration for dealing with the above is shown as a modification of the first embodiment and the second embodiment.

  First, a modification of the first embodiment will be described. In the present embodiment, in the mobile terminal 10 shown in FIG. 1, when the control unit 14 performs control for prohibiting data relay to the ad hoc network function unit 11, first, the own terminal 10 is the ad hoc network N1. It is determined whether or not data is relayed. That is, the control unit 14 performs the above determination when the determination unit 13 determines that the moving speed of the terminal 10 exceeds a predetermined reference value. Specifically, the control unit 14 makes the above determination by inquiring to the ad hoc network function unit 11 whether or not relaying is being performed (relay operation confirmation).

  When it is determined that the ad hoc network function unit 11 is relaying data at that time, the control unit 14 controls the ad hoc network function unit 11 to continue relaying only the data. In this case, the control unit 14 controls the ad hoc network function unit 11 to prohibit acceptance of a new route and transmission of data of the terminal 10 itself. On the other hand, when determining that the data is not relayed, the control unit 14 controls the ad hoc network function unit 11 to prohibit relaying all data as a node of the ad hoc network N1.

  When the ad hoc network function unit 11 confirms from the control unit 14 that the relay operation is in progress, the ad hoc network function unit 11 performs relaying depending on whether or not the terminal 10 holds information indicating that the terminal 10 is included in a route for relaying data. Judgment is made. The ad hoc network function unit 11 notifies the determination result to the control unit 14 as a confirmation response during relay operation.

  The ad hoc network function unit 11 continues to relay data when the control unit 14 performs control to continue only data relay. Specifically, when the ad hoc network function unit 11 receives data transmitted through a route specified by information held by itself, the ad hoc network function unit 11 relays the data according to the route. In this case, the ad hoc network function unit 11 is controlled to prohibit the acceptance of a new route from the control unit 14 and the transmission of data of the terminal 10 itself. Specifically, the ad hoc network function unit 11 does not perform routing processing when receiving a control signal for performing routing, as in the above-described embodiment.

  Subsequently, the processing (ad hoc network control method) executed by the mobile terminal 10 according to the present embodiment will be described with reference to the flowchart of FIG. This process is a process when the mobile terminal 10 configures the ad hoc network N1 as in the above-described embodiment.

  First, in the mobile terminal 10, the moving speed of the own terminal 10 is measured by the measuring unit 12 (S31, measurement step). Information indicating the measured moving speed is output to the determination unit 13. The determination unit 13 receives the information and determines whether the moving speed exceeds the reference value (S32, determination step). The determination result is notified from the determination unit 13 to the control unit 14.

  The control unit 14 refers to the determination result, and performs the following processing when the moving speed exceeds the reference value. When the routing function of the ad hoc network function unit 11 is operating, the control unit 34 determines whether or not the own terminal 10 is relaying data for the ad hoc network N1 (S33, S34, Control step). This determination is made by confirming that the ad hoc network function unit 11 is performing the relay operation as described above.

  When it is determined that the relay operation is being performed, the control unit 14 controls the ad hoc network function unit 11 to continue only the data relay (S35, control step). With this control, the ad hoc network function unit 11 relays data, but does not accept a new route and does not transmit data of the terminal 10 itself.

  In the above description, when it is determined that the relay operation is not being performed, the control unit 14 controls the ad hoc network function unit 11 to stop the routing function, similarly to the above-described embodiment (S36, control step). . Specifically, the relay of data including a control signal for the ad hoc network N1 is prohibited. Furthermore, it is preferable that not only relaying but also transmission / reception of data of the mobile terminal 10 itself is prohibited.

  On the other hand, when the above control is performed from the control unit 14 to the ad hoc network function unit 11 and the routing function of the ad hoc network function unit 11 is not operating, the control unit is similar to the above-described embodiment. No particular control is performed from 14 to the ad hoc network function unit 11, and the process ends (S33, control step).

  Moreover, in the control part 14, when the determination result by the determination part 13 is referred and the moving speed does not exceed the reference value, the following processing is performed as in the above-described embodiment. That is, when the routing function of the ad hoc network function unit 11 is operating, the control is not particularly performed from the control unit 14 to the ad hoc network function unit 11, and the process ends (S37, control step). Further, when the above control is performed from the control unit 14 to the ad hoc network function unit 11 and the routing function of the ad hoc network function unit 11 is not operating, the control unit 14 changes to the ad hoc network function unit 11. On the other hand, control for resuming the routing function is performed (S37, S38, control step).

  Subsequently, processing (ad hoc network control method) executed by the mobile terminal 10 according to the present embodiment will be described with reference to the sequence diagram of FIG. This process is a process when the ad hoc network N1 is configured by a plurality of mobile terminals 10. Here, processing of a specific mobile terminal 10 will be described.

  Since the mobile terminal 10 constitutes the ad hoc network N1, when data is transmitted from another terminal constituting the ad hoc network N1 (S41, 42), the ad hoc network function unit 11 performs routing such as data relaying. Processing is performed (S43). Here, the data transmitted to the mobile terminal 10 includes a control signal to be relayed for the ad hoc network N1. Here, it is assumed that the mobile terminal 10 moves (high speed) at a moving speed that exceeds a reference value in the determination unit 13.

  Subsequently, the moving speed of the mobile terminal 10 is measured by the measuring unit 12 (S44, measuring step). Information indicating the measured moving speed is output to the determination unit 13 (S45). The determination unit 13 receives the information and determines whether or not the moving speed exceeds a reference value (S46, determination step). The determination result is notified from the determination unit 13 to the control unit 14.

  Subsequently, the controller 14 confirms that the ad hoc network function unit 11 is performing the relay operation, thereby determining whether the terminal 10 is relaying data for the ad hoc network N1. (S47, control step). Subsequently, when the ad-hoc network function unit 11 confirms that the relay operation is being performed from the control unit 14, it is determined whether it is relaying data (during the data relay operation), and the determination result is the control unit 14. Is notified as a confirmation response during relay operation (S48).

  Here, it is assumed that the mobile terminal 10 (the ad hoc network function unit 11) relays data for the ad hoc network N1. In this case, the control unit 14 determines that the terminal 10 is relaying data, and the control unit 14 controls the ad hoc network function unit 11 to continue only data relay. That is, the ad hoc network function unit 11 is controlled to prohibit acceptance of a new route and transmission of data of the terminal 10 itself. These controls are performed by the command from the control unit 14 to the ad hoc network function unit 11 to stop some functions as described above (S49, control step).

  Based on this command, the ad hoc network function unit 11 stops a part of the routing function (S50, control step), and the mobile terminal 10 relays only the data transmitted by the already established route. It becomes.

  Thereafter, when data is transmitted from another terminal to the mobile terminal 10 (S51, S52), the mobile terminal 10 performs the following processing according to the data (S53). That is, the ad hoc network function unit 11 receives data transmitted from another terminal, and determines whether the data relates to data being relayed. This determination is made based on whether the data is data transmitted by a route specified by information held by the ad hoc network function unit 11. If the received data relates to data being relayed, the data is relayed by the ad hoc network function unit 11. If the received data is other data, the ad hoc network function unit 11 does not relay the data.

  Subsequently, in the mobile terminal 10, the moving speed of the mobile terminal 10 is measured again by the measuring unit 12 (S54, measurement step). Information indicating the measured moving speed is output to the determination unit 13 (S55). The determination unit 13 receives the information and determines whether or not the moving speed exceeds the reference value (S56, determination step). The determination result is notified from the determination unit 13 to the control unit 14. Here, it is assumed that the mobile terminal 10 continues to move at high speed.

  Subsequently, similarly to the above-described processing, whether or not the own terminal 10 is relaying data for the ad hoc network N1 is confirmed from the control unit 14 to the ad hoc network function unit 11 during confirmation of the relay operation. Is judged. (S57, control step). Subsequently, when the ad-hoc network function unit 11 confirms that the relay operation is being performed from the control unit 14, it is determined whether it is relaying data (during the data relay operation), and the determination result is the control unit 14. Is notified as a confirmation response during relay operation (S58).

  Here, it is assumed that the mobile terminal 10 (the ad hoc network function unit 11) does not relay data for the ad hoc network N1. That is, during S53 to S57, the data route related to the mobile terminal 10 disappears due to a timeout or the like, and the information indicating that the ad hoc network function unit 11 is included in the route through which the own terminal 10 relays data. It is assumed that the state is not held.

  In this case, when the control unit 14 determines that the terminal 10 is not relaying data, the control unit 14 controls the ad hoc network function unit 11 to stop the routing function as in the first embodiment. Is called. This control is performed by a command from the control unit 14 to the ad hoc network function unit 11 to stop the routing function (S59, control step).

  Thereby, in the ad hoc network N1, the relay and transmission / reception of the data concerning the mobile terminal 10 are not performed (S60, control step). Therefore, even if data is transmitted from another terminal to the mobile terminal 10 (S61, S62), the mobile terminal 10 does not perform processing such as relaying on the data, and the data is discarded.

  According to the above-described configuration, even if the data transmission is performed through the route including the mobile terminal 10 and the routing function is controlled when the moving speed of the mobile terminal 10 is increased, the routing is performed. Inducing route search processing (reroute processing) due to function control can be prevented.

  First, the modification of 2nd Embodiment is demonstrated continuously. In the present embodiment, in the ad hoc network control system 1 shown in FIG. 4, when the transmission unit 23 of the ad hoc network control device 20 transmits a control signal for prohibiting data relay to the mobile terminal 30, It is determined whether or not the terminal 30 is relaying data for the ad hoc network N1. That is, the transmission unit 23 performs the above determination when the determination unit 22 determines that the moving speed of the mobile terminal 30 exceeds a predetermined reference value. Specifically, the transmission unit 23 makes the above determination by making an inquiry (confirmation during relay operation) to the mobile terminal 30 as to whether or not the relay is being performed.

  If the transmission unit 23 determines that the mobile terminal 30 is relaying data at that time, the transmission unit 23 transmits a control signal for continuing only the relay of the data to the mobile terminal 30. Further, the control signal in this case also prohibits the mobile terminal 30 from accepting a new route and sending out data of the mobile terminal 30 itself. On the other hand, when determining that the mobile terminal 30 is not relaying data, the transmission unit 23 relays all data as a node of the ad hoc network N1 to the mobile terminal 30 as in the second embodiment. A control signal for prohibiting transmission is transmitted.

  In the mobile terminal 30, when the ad hoc network control device 20 confirms that the relay operation is being performed, the ad hoc network function unit 31 holds information indicating that the mobile terminal 30 is included in a route through which the terminal 10 relays data. It is determined whether relaying is performed or not. The ad hoc network function unit 31 notifies the ad hoc network control device 20 of the determination result as a confirmation response during relay operation.

  In the mobile terminal 30, when a control signal for continuing only data relay is transmitted from the ad hoc network control device 20, the reception unit 32 receives the control signal and outputs it to the control unit 33. The control unit 33 controls the ad hoc network function unit 31 based on the control signal. That is, the ad hoc network function unit 31 continues to relay data. Specifically, when the ad hoc network function unit 31 receives data transmitted by a route specified by information held by itself, the ad hoc network function unit 31 relays the data according to the route. In this case, the ad hoc network function unit 31 is controlled from the control unit 33 to prohibit acceptance of a new route based on the control signal and transmission of data of the mobile terminal 30 itself. Specifically, the ad hoc network function unit 31 does not perform routing processing when receiving a control signal for performing routing, as in the above-described embodiment.

  Subsequently, processing (ad hoc network control method) executed in the ad hoc network control system 1 according to the present embodiment will be described with reference to the sequence diagram of FIG. This process is a process when the ad hoc network N1 is configured by a plurality of mobile terminals 10. Here, processing of a specific mobile terminal 30 and the ad hoc network control device 20 will be described.

  Since the mobile terminal 30 constitutes the ad hoc network N1, when data is transmitted from another terminal constituting the ad hoc network N1 (S71, 72), the ad hoc network function unit 31 performs routing such as data relaying. Processing is performed (S43). Here, the data transmitted to the mobile terminal 30 includes a control signal to be relayed for the ad hoc network N1. Here, it is assumed that the mobile terminal 30 moves (high speed) at a moving speed that exceeds a reference value in the determination unit 22 of the ad hoc network control device 20.

  In the ad hoc network control device 20, the measuring unit 21 measures the moving speed of the mobile terminal 30 (S74, measuring step). Information indicating the measured moving speed is output to the determination unit 22. The determination unit 22 receives the information and determines whether the moving speed exceeds the reference value (S75, determination step). The determination result is notified from the determination unit 22 to the transmission unit 23.

  Subsequently, the transmission unit 23 confirms that the mobile terminal 30 is performing a relay operation, thereby determining whether or not the mobile terminal 30 is relaying data for the ad hoc network N1. (S76, transmission step). When the transmission unit 23 confirms that the relay operation is in progress, the ad hoc network function unit 31 determines whether the mobile terminal 30 is relaying data (during data relay operation), and the determination result is ad hoc. The network control device 20 is notified as a confirmation response during relay operation (S77).

  Here, it is assumed that the mobile terminal 30 (the ad hoc network function unit 31) relays data for the ad hoc network N1. In this case, the transmission unit 23 of the ad hoc network control device 20 determines that the mobile terminal 30 is relaying data, and the control signal (partial) causes the mobile terminal 30 to continue only data relay from the transmission unit 23. A function stop control signal) is transmitted (S78, transmission step). In the mobile terminal 30, the control signal is received by the receiving unit 32 (S78, receiving step).

  The control signal is output from the receiving unit 32 to the control unit 33. Based on the control signal, the control unit 33 controls the ad hoc network function unit 31 to continue only data relay. That is, the ad hoc network function unit 31 is controlled to prohibit acceptance of a new route and transmission of data of the mobile terminal 30 itself. These controls are performed from the control unit 33 to the ad hoc network function unit 31 by a command to stop a part of the functions as described above (S79, control step).

  Based on this command, the ad hoc network function unit 31 stops a part of the routing function (S80, control step), and the mobile terminal 30 relays only the data transmitted through the already established route. It becomes.

  Thereafter, when data is transmitted from another terminal to the mobile terminal 30 (S81, S82), the mobile terminal 30 performs the following processing according to the data (S83). That is, the ad hoc network function unit 31 receives data transmitted from another terminal, and determines whether or not the data relates to data being relayed. The determination is made based on whether the data is data transmitted by a route specified by information held by the ad hoc network function unit 31. If the received data relates to data being relayed, the data is relayed by the ad hoc network function unit 31. If the received data is other data, the ad hoc network function unit 31 does not relay the data.

  Subsequently, in the ad hoc network control device 20, the moving speed of the mobile terminal 30 is again measured by the measuring unit 21 (S84, measuring step). Information indicating the measured moving speed is output to the determination unit 22. The determination unit 22 receives the information and determines whether the moving speed exceeds the reference value (S75, determination step). The determination result is notified from the determination unit 22 to the transmission unit 23. Here, it is assumed that the mobile terminal 30 continues to move at high speed.

  Subsequently, similar to the above-described processing, the mobile terminal 30 relays data for the ad hoc network N1 by performing a relay operation confirmation from the transmission unit 23 of the ad hoc network control device 20 to the mobile terminal 30. It is determined whether or not. (S86, transmission step). Subsequently, in the mobile terminal 30, when the ad hoc network function unit 31 confirms that the relay operation is in progress from the ad hoc network control device 20, it is determined whether the mobile terminal 30 is relaying data (during data relay operation). The determination result is notified to the ad hoc network control device 20 as a confirmation response during relay operation (S87).

  Here, it is assumed that the mobile terminal 30 (the ad hoc network function unit 31) does not relay data for the ad hoc network N1. That is, between S83 and S86, the data route related to the mobile terminal 30 disappears due to a timeout or the like, and the information indicating that the ad hoc network function unit 31 is included in the route through which the own terminal 30 relays data. It is assumed that the state is not held.

  In this case, it is determined by the transmission unit 23 that the mobile terminal 30 is not relaying data, and the control signal for stopping the routing function from the transmission unit 23 to the mobile terminal 30 (function stop) as in the second embodiment. Control signal) is transmitted (S88, transmission step). In the mobile terminal 30, the control signal is received by the receiving unit 32 (S88, receiving step).

  The control signal is output from the receiving unit 32 to the control unit 33. Based on this control signal, the control unit 33 performs an instruction for stopping the routing function to the ad hoc network function unit 31 (S89, control step).

  Thereby, in the ad hoc network N1, the relay and transmission / reception of the data concerning the mobile terminal 30 are not performed (S90, control step). Therefore, even if data is transmitted from another terminal to the mobile terminal 30 (S91, S92), the mobile terminal 30 does not perform processing such as relaying on the data, and the data is discarded.

  According to the above-described configuration, even if the data is transmitted through the route including the mobile terminal 30 and the routing function is controlled when the moving speed of the mobile terminal 30 is increased, the routing is performed. Inducing route search processing (reroute processing) due to function control can be prevented.

It is a figure which shows the structure of the ad hoc network which consists of the mobile terminal and the said mobile terminal in 1st Embodiment of this invention. It is a figure which shows the hardware constitutions of the mobile communication terminal in 1st Embodiment of this invention. It is a flowchart which shows the process (ad hoc network control method) performed with the mobile terminal in 1st Embodiment of this invention. It is a figure which shows the structure of the mobile terminal in the 2nd Embodiment of this invention, the ad hoc network which consists of the said mobile terminal, and an ad hoc network control apparatus. It is a figure which shows the hardware constitutions of the ad hoc network control apparatus in 2nd Embodiment of this invention. It is a sequence diagram which shows the process (ad hoc network control method) performed with the ad hoc network control system in 1st Embodiment of this invention. It is a flowchart which shows the process (ad hoc network control method) performed with the mobile terminal in 3rd Embodiment of this invention. It is a sequence diagram which shows the process (ad hoc network control method) performed with the mobile terminal in 3rd Embodiment of this invention. It is a sequence diagram which shows the process (ad hoc network control method) performed with the ad hoc network control system in 1st Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Ad hoc network control system, 10 ... Mobile terminal 11 ... Ad hoc network function part, 12 ... Measurement part, 13 ... Judgment part, 14 ... Control part, 15 ... Information acquisition part, 16 ... Reference value setting part, 101 ... CPU, DESCRIPTION OF SYMBOLS 102 ... RAM, 103 ... ROM, 104 ... Operation part, 105 ... Wireless communication part, 106 ... Display, 107 ... Antenna, 20 ... Ad hoc network control apparatus, 21 ... Measurement part, 22 ... Judgment part, 23 ... Transmission part, 201 ... CPU, 202 ... RAM, 203 ... ROM, 204 ... communication module, 205 ... auxiliary storage device, 30 ... mobile terminal, 31 ... ad hoc network function part, 32 ... receiving part, 33 ... control part, N1 ... ad hoc network, N2 ... mobile communication network.

Claims (12)

A mobile terminal having a function of configuring an ad hoc network,
A measuring means for measuring the moving speed of the terminal;
Determining means for determining whether or not the moving speed measured by the measuring means exceeds a predetermined reference value;
Control means for performing control to prohibit relaying of data for the ad hoc network to the own terminal when the determination means determines that the moving speed exceeds the predetermined reference value;
Information acquisition means for acquiring information indicating the number of mobile terminals included in an ad hoc network configured to include the mobile terminals;
Information indicating the number of mobile terminals included in the ad hoc network acquired by the information acquisition means, and a reference value setting means for setting the reference value based on a predetermined decision rule;
A mobile terminal comprising:   The reference value setting means sets the reference value based on a decision rule such that the reference value becomes lower as the number of mobile terminals related to the information acquired by the information acquisition means increases. Item 4. The mobile terminal according to Item 1. The control means performs control to prohibit sending data from the own terminal to the ad hoc network when the determination means determines that the moving speed exceeds the predetermined reference value. The mobile terminal according to claim 1 or 2 , characterized in that: The information acquisition means also acquires information indicating the traffic generation amount and communication time per hour in an ad hoc network configured to include the mobile terminal ,
Said reference value setting means, the generation amount of traffic per acquired the time by the information acquisition means and be based on the information indicating the communication time, and sets the reference value, one of claims 1 to 3 one The mobile terminal according to item . The information acquisition means also acquires information indicating a moving speed of a mobile terminal different from the own terminal included in the ad hoc network configured to include the mobile terminal ,
The said reference value setting means sets the said reference value based also on the information which shows the moving speed of the said another mobile terminal acquired by the said information acquisition means , The statement of any one of Claims 1-4 Mobile terminal. The information acquisition means also acquires information indicating a required quality of communication in a mobile terminal different from the own terminal included in the ad hoc network configured to include the mobile terminal ,
Said reference value setting means, based also on the information indicating the requested quality of communication in the other mobile terminal acquired by the information acquisition unit, and sets the reference value, any one of claims 1 to 5 The mobile terminal according to. When the control means determines whether or not the terminal is relaying data for the ad hoc network when performing control to prohibit data relay, and determines that the relay is relaying, The mobile terminal according to claim 1, wherein only the data relay related to the determination is continued and control for prohibiting the relay of other data is performed. An ad hoc network control system including an ad hoc network control device included in a communication network, a mobile terminal having a function of configuring an ad hoc network and a function of connecting to the communication network,
Comprising measuring means for measuring the moving speed of the mobile terminal;
The ad hoc network control device
Determining means for determining whether or not the moving speed measured by the measuring means exceeds a predetermined reference value;
Control for prohibiting relaying of data for the ad hoc network to the mobile terminal related to the measurement of the moving speed when the determining means determines that the moving speed exceeds the predetermined reference value A transmission means for transmitting a signal;
Information acquisition means for acquiring information indicating the number of mobile terminals included in an ad hoc network configured to include the mobile terminals;
Information indicating the number of mobile terminals included in the ad hoc network acquired by the information acquisition means, and reference value setting means for setting the reference value based on a predetermined decision rule, and
The mobile terminal
Receiving means for receiving the control signal transmitted from the ad hoc network control device;
Control means for performing control to prohibit relay of data for the ad hoc network based on the control signal received by the receiving means;
An ad hoc network control system.   The ad hoc network control system according to claim 8, wherein the ad hoc network control device further includes the measurement unit. When the transmission means transmits a control signal for prohibiting data relay, it determines whether the mobile terminal is relaying data for the ad hoc network and determines that relay is being performed. 10. The ad hoc network control system according to claim 8, wherein , in the case, the control signal for continuing only the relay of the data related to the determination and prohibiting the relay of the other data is transmitted. An ad hoc network control method in a mobile terminal having a function of configuring an ad hoc network,
A measurement step for measuring the moving speed of the terminal itself;
A determination step of determining whether or not the movement speed measured in the measurement step exceeds a predetermined reference value;
A control step for performing control to prohibit relaying data for the ad hoc network to the own terminal when it is determined in the determination step that the moving speed exceeds the predetermined reference value;
An information acquisition step of acquiring information indicating the number of mobile terminals included in an ad hoc network configured to include the mobile terminal;
A reference value setting step of setting the reference value based on information indicating the number of mobile terminals included in the ad hoc network acquired in the information acquisition step and a predetermined decision rule;
An ad hoc network control method including: An ad hoc network control step in an ad hoc network control system including an ad hoc network control device included in a communication network, and a mobile terminal having a function of configuring an ad hoc network and a function of connecting to the communication network,
Including a measuring step of measuring a moving speed of the mobile terminal,
The ad hoc network controller is
A determination step of determining whether or not the movement speed measured in the measurement step exceeds a predetermined reference value;
Control for prohibiting relaying of data for the ad hoc network to the mobile terminal related to the measurement of the moving speed when it is determined in the determining step that the moving speed exceeds the predetermined reference value A transmission step of transmitting a signal;
An information acquisition step of acquiring information indicating the number of mobile terminals included in an ad hoc network configured to include the mobile terminal;
A reference value setting step of setting the reference value based on information indicating the number of mobile terminals included in the ad hoc network acquired in the information acquisition step and a predetermined decision rule;
The mobile terminal is
Receiving the control signal transmitted from the ad hoc network control device;
A control step for performing control to prohibit relaying of data for the ad hoc network based on the control signal received in the receiving step;
An ad hoc network control method including:

Images