JP2005136642A - Contents distribution system, method for controlling contents distribution system and communication terminal in use for contents distribution system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To properly distribute contents to communication terminal mounted on a traveling object. <P>SOLUTION: A contents distributing system is disclosed which includes at least one contents distributing device and a plurality of mobile communication terminals that perform bi-directional communication by adhock type radio communication, wherein the communication terminal is provided with: a data receiving part which receives data from the contents distributing device through communication; a data display part which displays contents based on the data received by the data receiving part on the screen of the communication terminal; a filtering information storing part which stores control information related with display control of the contents on the screen; and a filtering part which controls the data display part so as to display the contents according to the control information stored in the filtering storing part. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a technology for distributing content to a communication terminal mounted on a mobile body.

In recent years, various techniques for distributing contents such as regional information and advertisements to a communication terminal mounted on a mobile body such as an automobile using wireless communication have been proposed. For example, Patent Literature 1 discloses a technique for providing advertisement information corresponding to a current position of a mobile body to a communication terminal mounted on the mobile body such as a vehicle. Patent Document 2 discloses a technology for distributing advertisements from a store installation terminal to an in-vehicle terminal. Here, in any of the techniques disclosed in any of these documents, a mobile phone network, a general telephone line, or the like is used as a communication method for distributing advertisements to a mobile body.
JP 2002-288518 A JP 2003-58770 A

  As a technique for performing bidirectional communication between mobile units or between a mobile unit and a fixed station, a technology related to ad hoc wireless communication has been known (for example, IETF (The Internet Engineering Task Force (http: //www.ietf.org/html.charters/manet-charter.html))). In ad hoc wireless communication, communication is performed in a form in which a plurality of communication devices are bidirectionally connected without intervention of an access point. That is, in ad hoc wireless communication, a wireless communication network can be constructed without providing fixed equipment such as a wireless base station or a fixed router. For example, in ad hoc wireless communication, when a first communication device attempts to communicate with a second communication device that is outside the wireless radio wave reach of the communication device, the first and second communication devices Communication can be performed via a third communication device different from any of the above. As a protocol for ad hoc wireless communication, for example, GPSR (Greedy and Perimeter Stateless Routing: For example, B. Karp and HT Kung: “GPSR: Greedy Perimeter Stateless Routing for Wireless Networks”, Proceeding of Mobicom (2000) See) is known. In this protocol, the routing table associated with the location information of the terminal is constructed by including the location information of each terminal in the message transmitted to construct the routing table.

  At this time, the present inventors pay attention to such characteristics of such an ad hoc wireless communication technology, and efficiently distribute contents to a communication device mounted on a mobile body using the ad hoc wireless communication technology. I got a new idea about how it works. Even when the above protocol is used, for example, content may be distributed simultaneously from a plurality of distribution sources to the same communication terminal. Therefore, a mechanism for appropriately distributing contents in a form that assumes such a situation is also required.

  The present invention has been made in the above circumstances, and an object thereof is to provide a content distribution system capable of appropriately distributing content to a communication terminal mounted on a mobile body.

  A main invention of the present invention that achieves the above object is a content distribution system that includes at least one content distribution device and a plurality of movable communication terminals that perform two-way communication by ad hoc wireless communication. The communication terminal receives data distributed from the content distribution device by the communication, and displays the content based on the data received by the data reception unit on the screen of the communication terminal. A data display unit, a filtering information storage unit for storing control information related to display control of the content on the screen, and the data display unit to display the content according to the control information stored in the filtering storage unit And a filtering unit for controlling.

  According to the present invention, since content distribution is performed by ad hoc wireless communication, there is no need for equipment such as a fixed wireless base station, telephone line, fixed router, etc. unlike other communication methods, and low cost. With this, content can be distributed efficiently. Further, by controlling the display of content according to the filtering information, it is possible to appropriately distribute the content in a form preferable for the content distributor, the user of the communication terminal, and the like.

  According to the present invention, it is possible to appropriately distribute contents to a communication terminal mounted on a mobile body.

  Hereinafter, an embodiment of the present invention will be described in detail. FIG. 1 shows a schematic configuration of a content distribution system 1 described as an embodiment of the present invention. The content distribution system 1 includes a plurality of communication terminals 10 and one or more content distribution devices 20 mounted on a mobile body. The communication terminal 10 and the content distribution apparatus 20 perform bidirectional communication by ad hoc wireless communication (ad hoc network) that is an autonomous distributed wireless network. The moving body is, for example, an automobile, and the communication terminal 10 is integrated with an in-vehicle device such as a car navigation system and mounted on the moving body. The content distribution apparatus 20 is operated by a distributor such as a store manager existing in the area, for example. The content distribution device 20 distributes content such as advertisement information to the communication terminal 10. The content distribution device 20 may be a fixed station or may be mounted on a mobile body. When the moving body is an automobile, a driver of the automobile, for example, views content distributed from the content distribution device 20 installed in the drive destination area through the communication terminal 10. In this case, the content distributor is a local store manager, a resident, a local organization, or the like. With the mechanism described below, content is properly distributed from the content distribution device 20 to the communication terminal 10 by ad hoc wireless communication. Content distributors, for example, deliver advertisement information such as store advertisements and parking space availability to visitors in the area on a moving body such as a car, etc. To distribute advertisement information and regional information. Further, a visitor who browses the content makes a reservation for a parking lot by connecting to the other party such as the content distribution device 20 by ad hoc wireless communication using the fact that bidirectional communication is possible.

  FIG. 2 shows a hardware configuration of the communication terminal 10. The communication terminal 10 includes a processor 251 that executes a program, a memory 252 such as a RAM / ROM that stores programs and data, an external storage device 253 that is a nonvolatile storage device such as a hard disk device, and an interface that performs ad hoc wireless communication. A wireless communication interface 254, an input device 256 having operation buttons, a display device 258 such as a display, a voice input / output device 259 such as a microphone / speaker, a speed sensor, an acceleration sensor, a GPS receiver, etc. A position and orientation information acquisition device 260 that acquires information such as the current position, orientation, and traveling direction of the information processing apparatus is provided.

  FIG. 3 shows a hardware configuration of the content distribution apparatus 20. The content distribution device 20 performs a processor 351 that executes a program, a memory 352 such as a RAM / ROM that stores programs and data, an external storage device 353 that is a nonvolatile storage device such as a hard disk device, and ad-hoc wireless communication. A wireless communication interface 354 as an interface, an input device 356 such as a mouse and a keyboard, a display device 358 such as a display, and the like are configured. The content distribution apparatus 20 stores information (for example, latitude / longitude) indicating its own geographical position.

  Various programs are operating in the communication terminal 10 and the content distribution apparatus 20. The program may be stored in advance in each device, or may be supplied by a portable storage medium or a communication medium (a network or a carrier wave propagating through the network).

  The communication terminal 10 and the content distribution apparatus 20 have various functions related to distribution and reception of content realized by executing the above-described hardware and the above-described program. For example, in FIG. 1, the data transmission unit 104 of the communication terminal 10 transmits data to other communication terminals 10 and the content distribution device 20 by ad hoc wireless communication. The data receiving unit 101 receives data transmitted from another communication terminal 10 or the content distribution device 20 by ad hoc wireless communication. The data receiving unit 101 supplies the received data to the data display unit 106 described later. The data receiving unit 101 receives notification information described later. The data receiver 101 accesses the content distribution device 20 to receive (download) content. For example, HTTP (Hypertext Transfer Protocol) is used as a communication protocol used when receiving content. Content reception is performed by a function equivalent to a Web browser accessing a content storage address.

  The position / orientation information acquisition unit 102 acquires position information indicating the current position of the communication terminal 10, attitude information indicating the current attitude of the communication terminal 10, and traveling direction information indicating the current traveling direction of the communication terminal 10. The position / orientation information acquisition unit 102 appropriately notifies the data transmission unit 104 of the acquired position information and orientation information. The data transmission unit 104 transmits the position information, posture information, and travel direction information notified from the position / orientation information acquisition unit 102 to other communication terminals 10 and the content distribution device 20 as appropriate. The communication status acquisition unit 105 acquires communication status information that is information regarding the communication status of ad hoc wireless communication performed between the communication terminal 10 and another communication terminal 10 or the content distribution device 20. Note that the communication status information acquired by the communication status acquisition unit 105 includes a received signal strength indicator (RSSI), a packet loss rate, an available bandwidth, and the like. The communication status acquisition unit 105 notifies the data transmission unit 104 of the acquired communication status information as appropriate. The data transmission unit 104 appropriately transmits the communication status information notified from the communication status acquisition unit 105 to other communication terminals 10 and the content distribution device 20. The communication status acquisition unit 105 supplies the acquired communication status information to the data display unit 106 described later.

  The data display unit 106 sends a character to the display device 258 of the communication terminal 10 based on data notified from the data receiving unit 101 (for example, data in HTML (HyperText Markup Language) format or XML (Extensible Markup Language) format). And content consisting of video. The content may include audio information output to the audio output device 159.

  The filtering information storage unit 107 stores conditions and parameters for selecting contents to be displayed on the display device 258 by the data display unit 106 (hereinafter, these conditions and parameters are referred to as filtering information). The filtering rule setting unit 108 causes the user of the communication terminal 10 to set the filtering information to be stored in the filtering information storage unit 107. The filtering unit 109 controls the data display unit 106 so that the content is displayed according to the filtering information stored in the filtering information storage unit 107. As filtering information set for a user or the like, for example, there is information that specifies a store type such as displaying only contents relating to restaurants and displaying only contents relating to gas stations. In addition, for example, when title information is distributed along with content from the content distribution device 20, there is a control for displaying only the distributed title information or displaying only the content.

  As illustrated in FIG. 1, the content distribution device 20 transmits notification information to the communication terminal 10, a notification information setting unit 151 that sets notification information that is information indicating that content that can be distributed to the communication terminal 10 exists. A notification information transmission unit 152 and a content distribution unit 153 that distributes content in the display device 258 in response to access from the communication terminal 10 are provided.

  In the present embodiment, when “content is distributed (transmitted)”, the content is expressed on the communication terminal 10 (video, characters, etc. are displayed on the display device 258, or audio is output to the audio output device 259). Data to be transmitted (hereinafter referred to as content expression data) from the content distribution apparatus 20 to the communication terminal 10. In addition, “receive content” means that content expression data is received.

=== Content distribution ===
Next, a mechanism for distributing content from the content distribution apparatus 20 to the communication terminal 10 will be described with reference to the flowchart shown in FIG.

  First, the notification information transmission unit 152 of the content distribution device 20 specifies the communication terminal 10 that can distribute the content (S401). For example, the notification information transmission unit 152 refers to route information in ad hoc wireless communication, and acquires the network address of the communication terminal 10 capable of distributing content. When the communication terminal 10 capable of distributing content is specified, the notification information transmitting unit 152 next sets notification information, which is information for notifying that the content that can be distributed is held, to each communication terminal specified above. 10 is transmitted (S402). The notification information can be transmitted by a broadcast method or a multicast method. The notification information can be divided into a plurality of packets and transmitted.

  The notification information is generated by the notification information setting unit 151 of the content distribution device 20. FIG. 5 shows the data format of the notification information. In this figure, the address column 501 is set with the network address assigned to the content distribution apparatus 20 in ad hoc wireless communication, that is, the network address of the content distribution apparatus 20 that has transmitted the notification information. In the position / orientation information column 502, position information and attitude information, which are information indicating the position of the content distribution apparatus 20 that has transmitted the notification information, are set. In the path information column 504, path information that is information indicating a communication path traced while the notification information is transmitted from the content distribution apparatus 20 to the communication terminal 10 is set. In the content display time column 505, a display time that is information for designating a time for which the content is displayed on the display device 258 of the communication terminal 10 is set. In the memory holding time column 506, a memory holding time, which is information for designating a time for storing the notification information in the memory of the communication terminal 10, is set. In the display priority column 507, a display priority that is information indicating a priority when content is displayed on the display device 258 is set. In the attribute column 508, an attribute that is information for controlling display of content is set. Specific examples of the attribute include information indicating the genre of content transmitted from the content distribution device 20. The attribute is used as a parameter when the filtering unit 109 controls display / non-display of the content on the display device 258.

  After the notification information transmission unit 152 transmits the notification information in the process of (S402), the content distribution apparatus 20 shifts to a standby state (sleep) for a set predetermined time in order to prevent the CPU from being overloaded ( S403). When there is an end request by an operator or the like, the content distribution apparatus 20 ends the processing related to transmission of notification information (S404). If there is no termination request, the process proceeds to (S401) again.

  The communication terminal 10 monitors in real time whether the notification information has been received (S411). When the notification information is received (S411: YES), the communication terminal 10 determines whether the communication terminal 10 is already receiving content distributed from any of the content distribution devices 20 (S412). If the content is being received (S412: YES), the communication terminal 10 is set to the notification information received by the content distribution device 20 that distributes the content being received in the process of (S411). It is determined whether or not the content distribution apparatus 20 is the same (S413). If it is not the same as the content distribution apparatus 20 set in the notification information (S413: NO), the process proceeds to (S414).

  In the process of (S411), when the notification information is not received (S411: NO), the process proceeds to (S411). In the process of (S412), when the content is not being received (S412: NO), the process proceeds to the process (content reception process) of (S414). In the process of (S413), when the content distribution apparatus 20 that has already received the content is the same content distribution apparatus 20 as the content distribution apparatus 20 set in the notification information received in the process of (S411) ( (S413: YES), the process proceeds to (S415). As a result, the same content is not received (downloaded) repeatedly. In the process of (S415), if an end request is input by an operator or the like, this process is terminated (S415: YES). On the other hand, if there is no end request, the process proceeds to (S411) again.

  FIG. 6 is a flowchart for explaining the processing (content reception processing) of (S414) in the flowchart of FIG. In the process (S411), the communication terminal 10 determines whether the same notification information as the notification information received in the process (S411) is already stored in the memory 252 (S611). If the same notification information is not stored here, it is determined that the content corresponding to the received notification information is content that has not yet been received by the communication terminal 10, so that the communication terminal 10 receives the received notification. The content set is accessed by accessing the address set in the address column 501 of the information, and the received content is stored in the memory 252 (S612). The notification information is stored in the memory 252 (S613). If the notification information is already stored in the memory 252 in the process of (S611), the process proceeds to the process of (S614).

  In the process of (S614), when the notification information stored in the memory 252 exceeds the memory retention time set in the memory retention time column 506 of the notification information, the notification information is Delete from the memory 252 (S621). As a result, it is possible to prevent old notification information from being automatically deleted from the memory 252 and overflowing the memory storage area. In addition to the method using the memory holding time, a finite number n of cache storage areas are prepared, and when notification information exceeding a predetermined number is stored in the memory 252, the notification information is stored in the memory 252 by FIFO (Fast In Fast Out). It is also possible to delete them sequentially. By checking the number of notification information stored in the memory 252, the number of contents currently received by the communication terminal 10 can be grasped.

  According to the above mechanism, the same content is not repeatedly received every time the communication terminal 10 receives communication information of the same content. Thereby, the communication load in the communication terminal 10 and the content distribution apparatus 20 can be reduced. Ad hoc wireless communication can be used efficiently.

=== Received data ===
In the communication terminal 10, the notification information received in (S411) is stored and managed in the memory 252 of the communication terminal 10 as received data. The received data stored in the memory 252 includes information other than the information included in the notification information.

  The data format of the received data is shown in FIG. In this figure, the same content as that set in the corresponding name column of the notification information is set in the same name column as the notification information. In the communication status column 703, information indicating the communication status between the content distribution apparatus 20 that has transmitted the notification information and the communication terminal 10 that has received the notification information is set. The communication status set in the communication status column 703 is acquired by the communication status acquisition unit 105. In the reception time column 720, a time (time stamp) at which the notification information corresponding to the received data is received is set. This time is referred to when calculating the elapsed time from when the received data is stored in the memory 252 to the present. In the column of the content display flag 721, a content display flag (1: being displayed, 0: not displayed) indicating whether or not the content corresponding to the notification information is currently being displayed on the display device 258 is displayed. Is set.

=== Preferentially acquired from the content distribution apparatus on the traveling direction side ===
It is considered that users of the communication terminal 10 and the like often have a stronger interest in content distributed from the content distribution device 20 on the moving direction side of the mobile object. The communication terminal 10 has a mechanism for preferentially displaying the content transmitted from the content distribution device 20 existing on the traveling direction side on the display device 258.

  (S811) to (S812) in FIG. 8 are flowcharts for explaining this mechanism. First, the communication terminal 10 acquires its own traveling direction by the position / orientation information acquisition unit 102 (S811). Next, the communication terminal 10 is grasped by the position information of the content distribution device 20 included in the notification information received in (S411) and the notification information stored in the memory 252 and the position / attitude information acquisition unit 102. Compare with the traveling direction information of the communication terminal 10 to determine whether each content distribution device 20 corresponding to the notification information stored in the memory 252 is on the traveling direction side of the communication terminal 10. To do. Then, the communication terminal 10 controls the content distribution device 20 that is determined not to be in the traveling direction side by the above determination to be excluded from the content reception destination candidates (S812).

  According to the above configuration, the content distributed from the content distribution device 20 on the traveling direction side of the communication terminal 10 is preferentially displayed on the display device 258, which is in accordance with the needs of the user of the communication terminal 10. Content can be presented in the form.

=== Content is preferentially acquired from a nearby content distribution device 20 ===
It is considered that the user of the communication terminal 10 often has a strong interest in the content distributed from the content distribution device 20 located near the place where the user is. The communication terminal 10 has a mechanism for preferentially displaying the content distributed from the content distribution device 20 located near the communication terminal 10 on the display device 258.

  (S821) to (S824) in FIG. 8 are flowcharts for explaining this mechanism. The communication terminal 10 includes the position information of the content distribution device 20 included in the notification information received in (S411) and the notification information stored in the memory 252, and the communication terminal 10 acquired by the position / attitude information acquisition unit 102. Is compared with the position information of (821). Next, the communication terminal 10 accesses the content distribution apparatus 20 with the shortest distance to acquire content (S822). The communication terminal 10 stores the notification information in the memory 252 (S823). The communication terminal 10 deletes the notification information stored beyond the memory holding time from the memory 252 (S824).

According to the above configuration, the content distributed from the content distribution device 20 near the communication terminal 10 is preferentially displayed on the display device 258, and the content conforms to the needs of the user and the like. Can be presented.
Note that the processing of (S821) to (S824) can be executed in combination with the processing shown in FIG. 6, for example. Further, the processes of (S811) to (S812) described above can be executed in combination with the processes of (S821) to (S824).

== Guaranteed display time ===
For example, if a content distributed from another content distribution device 20 is received immediately after the content distributed from a certain content distribution device 20 is displayed, the display time of the content being displayed first is sufficient. Will not be secured. In some cases, it is preferable to display the content for a certain time or more, such as traffic jam information or accident information. Therefore, the communication terminal 10 has a mechanism for displaying the received content for at least a certain display time.

  FIG. 9 is a flowchart for explaining this mechanism. When the notification information is received in (S411), the communication terminal 10 determines whether the currently displayed content is displayed for the display time set in the display time column 505 of the notification information corresponding to the content. (S911). If it is displayed for longer than the display time, the communication terminal 10 accesses the address set in the address field 501 of the notification information received in (S411) and acquires the content (S912). The communication terminal 10 stores the notification information received in (S411) (S913).

  In (S911), if no display time is displayed, the display priority set in the display priority column 407 of the notification information received in (S411) and the display priority of the currently displayed content The degree is compared to determine which is higher (S914). Here, the display priority is set randomly or in accordance with a predetermined rule in the content distribution apparatus 20. The reason for determining the display priority in this way is that a certain content is always displayed depending on the positional relationship between the communication terminal 10 and the content distribution device 20, but a certain content is not always displayed. It is to make it. If the display priority set in the display priority column 407 of the notification information received in (S411) is higher (S914: YES), the processing proceeds to (S912), and the notification information received in (S411) The content corresponding to is received. That is, the content corresponding to the notification information received in (S411) is preferentially displayed on the display device 258 of the communication terminal 10. If the display priority of the currently displayed content is higher (S914: NO), the processing of (S912) to (S913) is skipped. That is, in this case, the content currently displayed on the display device 258 is continuously displayed as it is. The processing of (S911) to (S914) can be executed in combination with the processing shown in FIG. 6, for example. Note that, by setting the display priority, for example, the content distributor can appropriately secure the display time of the content.

=== Display multiple contents ===
The communication terminal 10 has a mechanism for simultaneously displaying a plurality of different contents on the display device 258. FIG. 10 is a flowchart for explaining this mechanism.

  The communication terminal 10 determines whether the notification information is received from the plurality of content distribution apparatuses 20 by checking the number of notification information stored in the memory 252 (S1011). If the notification information has not been received from a plurality of content distribution apparatuses 20 (S1011: NO), the communication terminal 10 accesses the address set in the address field 501 of the notification information received in (S1011). The content is acquired (S1019), and the process proceeds to (S1017).

  The communication terminal 10 stores an HTML file configured to assign a plurality of contents to a frame for display. FIG. 11A and FIG. 11B show examples of screens displayed by the HTML file. FIG. 11A shows an example of a screen when the number of frames is two, and FIG. 11B shows an example of a screen when the number of frames is three. In (S1011), when the communication terminal 10 has received notification information from a plurality of content distribution apparatuses 20 (S1011: YES), the communication terminal 10 displays frames that are equal to or greater than the number of stored notification information. The HTML file to be selected is selected (S1012).

  Next, the communication terminal 10 checks whether there is an empty frame in the HTML file selected in (S1012) (S1013). If there is an empty frame (S1013: YES), the content display flag column of the notification information stored in the memory 252 is checked to correspond to the notification information received this time in (S411). It is checked whether the content expression data has already been written in the HTML file (S1014). If the content expression data has already been written in the HTML file (S1014: YES), the process proceeds to (S1017). If not written (S1014: NO), the process proceeds to (S1015). In this way, when content is already displayed, it is written to the HTML file depending on whether it is written to the HTML file, so that the content is not displayed repeatedly and the display area of the screen is effective. In addition, the user of the communication terminal does not feel uncomfortable due to overlapping display.

  In (S1015), for the HTML file selected in (S1012), communication terminal 10 displays the content at the address set in address field 501 of the notification information newly received in (S411) in the empty frame. In this way, the HTML file is set (S1015), and the content is acquired from the address. In addition, the communication terminal 10 sets a flag in the content display flag column 621 of the received data corresponding to the content (S1016). Further, the communication terminal 10 stores the notification information in the memory 252 (S1017), and further deletes the notification information stored beyond the memory holding time from the memory 252 (S1018).

  According to the above mechanism, information from a plurality of content distribution apparatuses 20 can be simultaneously displayed on one screen, and a large amount of information can be simultaneously provided to the user of the communication terminal 10 or the like. Note that the processing of (S1011) to (S1019) can be executed in combination with, for example, the content reception processing shown in FIG.

=== Display and Control of Various Information ===
The communication terminal 10 displays various types of information using received data stored in the memory 252. Various information displayed on the display device 258 by the communication terminal 10 will be described together with the data format of the received data shown in FIG.

  The data display unit 106 of the communication terminal 10 displays a video (icon) indicating the position of the other communication terminal 10 or the content distribution device 20 together with a map video around the current position of the communication terminal 10. The map image is stored in, for example, the external storage device 153 or the memory 252.

  The communication terminal 10 displays the communication status between the communication terminal 10 and the content distribution device 20 acquired by the communication status acquisition unit 105 together with the content acquired from the content distribution device 20 on the display device 258. By displaying the communication status in this way, the user of the communication terminal 10 can visually grasp the communication status between the communication terminal 10 and the content distribution device 20. Further, for example, it is possible to grasp whether or not the current location is a convenient location for receiving the content distributed from the content distribution device 20. In addition, a maintenance worker of the communication terminal 10 can easily grasp the communication status between the communication terminal 10 and the content distribution apparatus 20 at the time of inspection or maintenance of the communication terminal 10, Work can be done efficiently.

  The data display unit 106 controls display / non-display of the video (icon) indicating the position of the content distribution device 10 on the display device 258 according to the distance between the communication terminal 10 and the content distribution device 20. In this control, the data display unit 106 determines the distance between the communication terminal 10 and the content distribution device 20 based on the position of the communication terminal 10 and the position information of the content distribution device 20 set in the notification information. If the distance is less than or equal to a predetermined threshold value, the content distribution device 20 is displayed on the display device 258, and if it is greater than the threshold value, it is not displayed on the display device 258. In addition, the data display unit 106 acquires the traveling direction of the communication terminal 10 from the posture information, and is not on the traveling direction side of the communication terminal 10 and exists on the side opposite to the traveling direction side of the communication terminal 10. The content distributed from the content distribution device 20) is controlled not to be displayed on the display device 258 (1210). As a result, a lot of information is not provided unnecessarily, so that information required by the user of the communication terminal 10 can be efficiently acquired.

  The data display unit 106 highlights the video of the content distribution device 20 from which the communication terminal 10 is receiving the content, out of the video indicating the position of the content distribution device 20 displayed overlaid on the map video ( For example, blinking, color change, etc.). For example, when the content distribution device 20 and the communication terminal 10 are in a communicable state, the data display unit 106 displays a line connecting the two on the display device 258. Thereby, the user of a communication terminal etc. can grasp | ascertain visually the position of the content delivery apparatus 20 which has delivered the content.

  Further, the data display unit 106 corresponds to the quality of the communication status, for example, as shown in FIG. 12, when there is no communication, there is no line, when communication is performed at a low communication speed, a thin line, high communication. When communicating at a speed, the line is changed to a thick line (1211). The quality of the communication status is determined based on, for example, RSSI, packet loss rate, communication bit rate, etc., which are information acquired in ad hoc wireless communication. Further, the communication terminal 10 controls display / non-display of a video (icon) indicating the position of the content distribution device 20 according to these values. In addition, the data display unit 106 displays / not displays the video (icon) indicating the position of the content distribution device 20 on the display device 258 according to the information indicating the communication status set in the communication status column 703 of the notification information. The display is controlled (1212). In addition, it is possible to prevent reception of content distributed from the content distribution device 20 in which the communication state is not good (communication quality exceeding a preset threshold cannot be ensured).

  The data display unit 106 includes, for example, the number of hops in ad-hoc wireless communication between the content distribution device 20, the communication terminal 10, and the content distribution device 20 included in the contents of the path information of the received data (in the column 704). Then, the number of hops between the communication terminal 10 and the content distribution device 20 is obtained based on the Metric value of the routing table in the ad hoc wireless communication managed by the communication terminal 10. Then, the data display unit 106 For example, display / non-display of a video (icon) indicating the content distribution device 20 is controlled according to the obtained number of hops (1213).

  FIG. 13 is a flowchart for explaining processing related to information display and control described above. First, the data display unit 106 determines whether the communication terminal 10 has received notification information (S1311). If the communication terminal 10 receives the notification information, the process proceeds to (S1312). In the processing of (S1312), the communication terminal 10 compares the contents of the received notification information with various threshold values stored in the filtering information storage unit 107 based on the rules stored in the filtering information storage unit 107. Thus, it is determined whether or not to display the video (icon) indicating the position of the content distribution apparatus 20 that has transmitted the notification information on the display apparatus 258. For example, the distance to the content distribution device 20 corresponding to the received notification information is “Dis”, the direction of the content distribution device 20 when viewed from the terminal 1 is “Dir”, and the communication status between the content distribution device 20 and the terminal 1 Is “Stat”, the number of hops from the content distribution apparatus 20 to the terminal 1 is the parameter “Hop”, and the threshold values described in the threshold list 157 corresponding to these parameters are “DisT”, “DirT”, “StatT”, respectively. , “HopT”. In this case, the rule is that (1) If Dis> DisT, a video (icon) indicating the position of the content distribution device 20 is displayed. (2) If Stat <StatT, the position of the content distribution device 20 is set. The video (icon) to be displayed is not displayed. The rule is a program that the filtering rule setting unit 108 accepts an input operation by the user of the communication terminal 10 or is received from another device via a portable storage medium or a communication medium (a network or a carrier wave propagating through the network). It is set by executing.

The data display unit 106 displays a video indicating the position of the content distribution device 20 selected to be displayed according to the rule, and a line indicating the communication status between the content distribution device 20 and the communication terminal 10 (S1313). ).
The data display unit 106 ends the process when receiving an end request due to a user input interrupt, a program interrupt, or the like (S1314: YES). Otherwise, the process proceeds to (S1314: NO). In this way, processing related to information display and control is performed.

  By the way, the above description is for facilitating the understanding of the present invention, and does not limit the present invention. It goes without saying that the present invention can be changed and improved without departing from the gist thereof, and the present invention includes equivalents thereof.

It is a figure which shows schematic structure of the content delivery system 1 concerning one Example of this invention. It is a figure which shows the hardware constitutions of the communication terminal 10 concerning one Example of this invention. It is a figure which shows the hardware constitutions of the content delivery apparatus 20 concerning one Example of this invention. It is a figure which shows the flowchart explaining the structure in which a content is delivered to the communication terminal 10 from the content delivery apparatus 20 concerning one Example of this invention. It is a figure which shows the data format of the notification information concerning one Example of this invention. It is a figure which shows the flowchart explaining the content reception process concerning one Example of this invention. It is a figure which shows the data format of the notification information concerning one Example of this invention. It is a figure which shows the flowchart explaining the structure which displays the content concerning one Example of this invention preferentially. It is a figure which shows the flowchart explaining the mechanism in which the received content concerning one Example of this invention is displayed for at least fixed display time. It is a figure which shows the flowchart explaining the mechanism in which a several different content is simultaneously displayed on the display apparatus 258 concerning one Example of this invention. FIG. 11A is a diagram showing a screen example when the number of frames is two, which is displayed based on the HTML file in one embodiment of the present invention, and FIG. 11B is based on the HTML file in one embodiment of the present invention. It is a figure which shows the example of a screen in case the number of frames displayed is three. It is a figure which shows the data format of the reception data concerning one Example of this invention. It is a figure which shows the flowchart explaining the process regarding the display of information and control concerning one Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Content delivery system 10 Communication terminal 20 Content delivery apparatus 101 Data receiving part 102 Position and orientation information acquisition part 104 Data transmission part 105 Communication status acquisition part 106 Data display part 107 Filtering information storage part 108 Filtering rule setting part 109 Filtering part 151 Notification information Setting unit 152 Notification information transmission unit 153 Content distribution unit

Claims (14)

A content distribution system configured to include at least one content distribution device and a plurality of movable communication terminals, which perform bi-directional communication by ad hoc wireless communication,
The communication terminal is
A data receiving unit for receiving data distributed from the content distribution device by the communication;
A data display unit for displaying content based on the data received by the data receiving unit on a screen of the communication terminal;
A filtering information storage unit that stores control information related to display control of the content on the screen;
A filtering unit that controls the data display unit to display the content according to the control information stored in the filtering storage unit;
A content distribution system comprising: The content distribution system according to claim 1,
The communication terminal includes a location information receiving unit that receives location information that is information indicating a location of the content delivery device from the content delivery device,
The data display unit displays, on the screen, a video indicating the position of the content distribution device generated based on the position information together with the content;
Content distribution system characterized by The content distribution system according to claim 1,
The data receiving unit receives notification information that is information notifying that the content distribution device has the distributable content,
The data receiving unit does not receive the content when data for displaying the content indicated in the notification information is already stored;
Content distribution system characterized by The content distribution system according to claim 1,
The data receiving unit receives notification information that is information notifying that the content distribution device has the distributable content,
The data receiving unit receives data for displaying the content by accessing a location indicated in the notification information;
The data receiving unit receives display time information which is information indicating a display time of the content;
The data display unit controls the display time specified by the display time information to display at least the content;
Content distribution system characterized by The content distribution system according to claim 4,
The data receiving unit receives the display priority of the content on the display device from the content distribution device and preferentially displays the content with the high priority on a screen;
Content distribution system characterized by The content distribution system according to claim 1,
The communication terminal includes a traveling direction acquisition unit that acquires traveling direction information that is information indicating a traveling direction of the communication terminal,
The data receiving unit receives position information which is information indicating a position of the content distribution device;
The data display unit preferentially displays the content transmitted from the content distribution device existing on the traveling direction side on the screen based on the position information of the content distribution device and the traveling direction information. about,
Content distribution system characterized by The content distribution system according to claim 1,
The communication terminal includes a traveling direction acquisition unit that acquires position information that is information indicating a position of the communication terminal.
The data receiving unit receives position information which is information indicating a position of the content distribution device;
The data receiving unit acquires current position information that is information indicating a current position of the communication terminal,
The data display unit obtains a distance between the communication terminal and the content distribution apparatus based on the position information of the communication terminal and the position information of the content distribution apparatus, and is located at a position close to the communication terminal. Control to preferentially display content distributed from the content distribution device on the screen;
Content distribution system characterized by The content distribution system according to claim 1,
The data display unit allocates a plurality of contents based on the plurality of data received from each of the plurality of content distribution devices by the data reception unit to each frame provided by dividing the display area of the screen. Simultaneously displaying a plurality of contents on the screen;
Content distribution system characterized by The content distribution system according to claim 8,
The data display unit stores information indicating whether the content is currently displayed on the screen;
The data display unit determines whether each of the plurality of contents is currently displayed on the screen based on the information, and if displayed, does not display the content on the screen;
Content distribution system characterized by The content distribution system according to claim 1,
A communication status acquisition unit that acquires communication status information that is information indicating a communication status in the ad hoc communication between the communication terminal and the data content distribution device;
The data display unit displays the communication status information acquired by the communication status acquisition unit together with the content on the screen;
Content distribution system characterized by The content distribution system according to claim 1,
The data display unit includes information indicating the number of hops between the communication terminal and the content distribution device in the ad hoc wireless communication, information indicating a distance between the communication terminal and the content distribution device, the communication Obtaining at least one of information indicating the direction of travel of the terminal and information indicating the communication status of the communication terminal;
The data display unit controls display / non-display of the information indicating the position of the content distribution device on the screen according to at least one of the acquired information;
A content distribution system comprising: The content distribution system according to claim 1,
The data display unit, when the content is being displayed, highlighting on the screen a video indicating a position of a content distribution device that has distributed the content;
Content distribution system characterized by A control method of a content distribution system configured to include at least one content distribution device and a plurality of movable communication terminals that perform bi-directional communication by ad hoc wireless communication,
The communication terminal is
Receiving data distributed from the content distribution device by the communication;
Display the content based on the received data on the screen of the communication terminal;
Storing control information related to display control of the content on the screen;
Controlling to display the content according to the stored control information;
A method for controlling a content distribution system characterized by the above. The communication terminal used in a content distribution system configured to include at least one or more content distribution apparatuses and a plurality of movable communication terminals that perform bidirectional communication by ad hoc wireless communication,
A data receiving unit for receiving data distributed from the content distribution device by the communication;
A data display unit for displaying content based on the data received by the data receiving unit on a screen of the communication terminal;
A filtering information storage unit that stores control information related to display control of the content on the screen;
A filtering unit that controls the data display unit to display the content according to the control information stored in the filtering storage unit;
A communication terminal used for a content distribution system comprising:

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