JP4654950B2 - Information broadcasting system, information broadcasting method and program thereof - Google Patents

Description

  The present invention relates to an information broadcast system, an information broadcast method, and a program thereof, and more particularly to an information broadcast system, an information broadcast method, and a program thereof that apply an IPv6 address as an address.

  A conventional example of configuring an IPv6 address (GBA: Geo Based Universal Address or Geometrical Based Address) based on location information is disclosed in Japanese Patent Laid-Open Publication No. 2006-204286, “IP Address Determination Method Based on Location Information and its Received Packet” Determination method and program "and Internet-Draft (IETF) of Non-Patent Document 1. Further, Patent Document 1 further describes an example of a system for transmitting information to a receiving terminal in a specific area using an address having a GBA structure.

  Here, although the address of the GBA structure has a difference in the bit assignment of the position information, roughly speaking, as shown in FIG. 5, the IPv6 address has a prefix part indicating the network in the upper 64 bits and the lower 64 bits. The interface ID part is assigned to the position ID, and the position information is stored in the lower 64 bits of the interface ID part.

  A receiving terminal in a system having a conventional IPv6 address configuration such as Patent Document 1 includes a receiving geographical range specifying means for specifying a receiving geographical range of its own terminal by an input device such as a GPS (Global Positioning System) or a keyboard, IP address superimposition determining means for determining whether or not the geographical range portion indicated by the address of the GBA structure of the received packet is included in the received geographical range specified by the received geographical range specifying means, If included, the received packet is configured to be received.

As a result, the sending terminal sends a packet with the address of the GBA structure configured by the geographic range information indicating the intended geographic range as the information transmission destination to the receiving terminal in the corresponding geographic range. It is possible to send directly. That is, in the sending terminal, the prefix of the IPv6 128-bit destination address stores the prefix of the network in which the receiving terminal to be transmitted is accommodated, and the lower 64 bit interface ID part. Is configured to store the geographical range information in which the receiving terminal exists, and can directly transmit the packet having the address structure of the GBA structure to the receiving terminal.
JP-A-2005-204286 (page 5-14, FIGS. 1 and 6) “Mapping Universal Geographical Area Description to IPv6 Geo Based Unicast Address”, IETF, Internet-Draft, draft-vanmegen-ipv6-addr-00, Internet, <URL: http: //www.watersprings.org/pub/id/draft- vanmegen-ipv6-addr-00.txt>

  However, the conventional system shown in Patent Document 1 has the following problems. The first problem is in the following points.

  For example, if you want to increase the effectiveness of broadcasting, such as when you are using it for information broadcasting services such as advertisements and emergency information for a large number of unspecified receiving terminals that exist in a specific geographical area, It is necessary that as many receiving terminals as possible within the range can receive the information. However, the prefix of the address of the receiving terminal is determined by the network in which the receiving terminal is accommodated. For example, the prefix of various values varies depending on the country or provider in which the receiving terminal is accommodated.

  Therefore, in the conventional system as described above, the transmitting terminal knows various prefixes of the receiving terminal even though the receiving terminals are within the same specific area range, even though they have various prefixes. As a result, for example, there is a problem that the information broadcasting service is limited to only the receiving terminal accommodated in the specific provider, and the effect of the broadcasting service is reduced.

  The second problem is as follows.

  In the conventional system, the address of the GBA structure that is the destination of the transmission terminal is an address having reachability to the reception terminal as it is. However, if the transmission terminal is an unauthorized terminal, the reception terminal There is a problem that it is likely to be a target of an attack from the unauthorized terminal. That is, there is a problem that a packet using a destination address storing a geographical range directly reaches the corresponding receiving terminal from the transmitting terminal, so that the receiving terminal is easily attacked by an unauthorized transmitting terminal.

  Furthermore, although communication between the transmission terminal and the reception terminal can be secured by authentication of the transmission terminal and communication encryption, as the number of transmission terminals that the reception terminal should secure secure communication increases, On the receiving terminal side, it becomes difficult to manage information for establishing secure communication such as an encryption key. Even if security measures are taken as described above, the receiving terminal is susceptible to an attack from the transmitting terminal that knows the address reaching the receiving terminal, such as an abnormally high communication load.

  As described above, in the conventional system, even if an information broadcast system for an arbitrary region is to be constructed, the number of receiving terminals that can be broadcast is limited, and the receiving terminal has such information for security reasons. There is a strong tendency to avoid using the broadcasting system, and even if you try to perform advertising broadcasting service, you can not get enough advertising effect, even if you want to broadcast emergency alerts and administrative information thoroughly There was a problem that was not made.

  The present invention has been made in view of such circumstances, and includes a transfer node that registers in advance at least position information and a destination address of a receiving terminal as transfer destination information, and blocks a packet from an unauthorized transmitting terminal. When a packet containing information about the specified geographic area from a terminal is received, the information broadcast service is performed by converting the address to the destination address of the receiving terminal registered in advance and transferring it to the receiving terminal of the broadcast destination. The purpose of the present invention is to provide an information broadcasting system, an information broadcasting method, and a program thereof that can be provided to a large number of receiving terminals within a specified geographic area and that can prevent unauthorized attacks on the receiving terminals. Yes.

  In order to solve the above-described problems, the information broadcast system, the information broadcast method, and the program thereof according to the present invention employ the following characteristic configuration.

(1) One or a plurality of transmitting terminals and one or a plurality of receiving terminals are connected via a network, and IPv6 (Internet) is sent to a receiving terminal within a geographical range arbitrarily designated from the transmitting terminal.
An information broadcasting system for broadcasting information as a packet using Protocol Version 6), which is connected to the network and receives the information broadcasting packet transmitted by the transmitting terminal and transmits the packet. A forwarding node for forwarding to a receiving terminal to be transmitted, and when the transmitting terminal performs information broadcasting to the receiving terminal in an arbitrary geographical area, the transmitting terminal transmits a destination address of the packet for information broadcasting The GBA (Geographical) has a prefix part as a prefix of a network in which the forwarding node is accommodated, and an interface ID part of a destination address of the packet as geographical range information indicating a geographical range of the receiving terminal as a broadcast destination.
An information broadcast system that transmits the packet to the forwarding node as an address of a Based Address structure.
(2) The forwarding node has a correspondence table in which at least the destination address and position information of the receiving terminal are registered in advance as forwarding destination information for each receiving terminal, and when the packet for information broadcast is received from the sending terminal In addition, by indexing the position information for each receiving terminal of the correspondence table, the receiving terminal existing in the geographical range indicated by the geographical range information set in the interface ID portion of the destination address of the packet is identified, The information broadcasting system according to (1), wherein the destination address of the corresponding receiving terminal is extracted from the correspondence table and the destination address of the packet is rewritten to transfer the received packet to the receiving terminal.
(3) When the forwarding node detects that there are a plurality of receiving terminals to which the packet for information broadcast received from the sending terminal exists when referring to the correspondence table, the forwarding node receives Duplicate the required number of packets, set the destination address of each receiving terminal extracted from the correspondence table to each duplicated packet, and transfer the same information to (2) above to each receiving terminal. Information system.
(4) The forwarding node further registers, as the forwarding destination information in the correspondence table, a transmitting terminal that permits or prohibits reception of a packet for each receiving terminal in advance, for information broadcast received from the transmitting terminal. When a receiving terminal that should be transferred by indexing the correspondence table based on the geographical range information of the packet is detected, from the transmitting terminal that the receiving terminal registers as reception permission or reception prohibition in the correspondence table The information broadcast system according to (2) or (3), wherein it is determined whether the packet is a packet from a transmission terminal permitted to receive the packet, and the packet is transferred to the reception terminal.
(5) When the forwarding node registers a transmitting terminal that permits or prohibits reception of a packet, the forwarding node registers that there is no transmitting terminal that prohibits reception of the packet as the forwarding destination information in the correspondence table. The information broadcast system according to any one of (2) to (4) above.
(6) The forwarding node sets the destination address of the receiving terminal registered in the correspondence table as a normal IPv6 address that does not use geographic range information, and broadcasts the information according to any one of (2) to (5) above system.
(7) When the receiving terminal newly registers the forwarding destination information in the correspondence table of the forwarding node, or when updating the forwarding destination information already registered, the receiving terminal is new to the forwarding node. The information broadcast system according to any one of (2) to (6), wherein a registration notification requesting registration or update registration is transmitted.
(8) When the receiving terminal is a movable terminal, the registration notification is transferred at regular intervals at predetermined time intervals or whenever movement larger than a predetermined moving distance is detected. The information broadcast system according to (7), which is transmitted to a node.
(9) The above (1) to (1) using an IPsec (IP Security) protocol as a security protocol for communication between the transmitting terminal and the forwarding node and / or communication between the receiving terminal and the forwarding node. The information broadcast system according to any one of (8).
(10) One or a plurality of transmitting terminals and one or a plurality of receiving terminals are connected via a network, and IPv6 (Internet) is sent to a receiving terminal within a geographical range arbitrarily designated from the transmitting terminal.
An information broadcast method for broadcasting information as a packet using Protocol Version 6), which is connected to the network and receives the information broadcast packet transmitted by the transmitting terminal and transmits the packet. A forwarding node for forwarding to a receiving terminal to be transmitted, and when the transmitting terminal performs information broadcasting to the receiving terminal in an arbitrary geographical area, the transmitting terminal transmits a destination address of the packet for information broadcasting The GBA (Geographical) has a prefix part as a prefix of a network in which the forwarding node is accommodated, and an interface ID part of a destination address of the packet as geographical range information indicating a geographical range of the receiving terminal as a broadcast destination.
An information broadcast method for transmitting the packet to the forwarding node as an address of a Based Address structure.
(11) The forwarding node includes a correspondence table in which at least a destination address and location information of the receiving terminal are registered in advance as forwarding destination information for each receiving terminal, and when the packet for information broadcast is received from the sending terminal In addition, by indexing the position information for each receiving terminal of the correspondence table, the receiving terminal existing in the geographical range indicated by the geographical range information set in the interface ID portion of the destination address of the packet is identified, The information broadcast method according to (10), wherein the destination address of the corresponding receiving terminal is extracted from the correspondence table, and the received packet is transferred to the receiving terminal by rewriting the destination address of the packet.
(12) When the forwarding node detects that there are a plurality of receiving terminals to which the packet for information broadcast received from the transmitting terminal exists when referring to the correspondence table, the forwarding node has received Duplicate the required number of packets, set the destination address of each receiving terminal extracted from the correspondence table to each duplicated packet, and transfer the same information to (11) above to each receiving terminal. Reporting method.
(13) The forwarding node further registers in advance for each receiving terminal a transmission terminal that permits or prohibits reception of the packet as the transfer destination information of the correspondence table, and for information broadcast received from the transmission terminal. When a receiving terminal that should be transferred by indexing the correspondence table based on the geographical range information of the packet is detected, from the transmitting terminal that the receiving terminal registers as reception permission or reception prohibition in the correspondence table The information broadcast method according to (11) or (12), wherein it is determined whether the packet is a packet from a transmission terminal permitted to receive the packet, and the packet is transferred to the reception terminal.
(14) The forwarding node registers, as the forwarding destination information in the correspondence table, that there is no sending terminal that prohibits packet reception when registering a sending terminal that permits or prohibits packet reception. The information broadcast method according to any one of (11) to (13) above.
(15) The forwarding node sets the destination address of the receiving terminal registered in the correspondence table as a normal IPv6 address that does not use geographic range information, and broadcasts the information according to any one of (11) to (14) above Method.
(16) When the receiving terminal newly registers the forwarding destination information in the correspondence table of the forwarding node, or when updating the forwarding destination information already registered, the receiving terminal is new to the forwarding node. The information broadcast method according to any one of (11) to (15), wherein a registration notification requesting registration or update registration is transmitted.
(17) When the receiving terminal is a movable terminal, the registration notification is transferred at regular intervals at predetermined time intervals or whenever movement larger than a predetermined moving distance is detected. (16) The information broadcasting method of (16) transmitted to the node.
(18) The above (10) to (10) using an IPsec (IP Security) protocol as a security protocol for communication between the transmitting terminal and the forwarding node and / or communication between the receiving terminal and the forwarding node. The information broadcasting method according to any one of (17).
(19) An information broadcast program that realizes the information broadcast method according to any one of claims 10 to 18 as a program executable by a computer.

  According to the information broadcast system, the information broadcast method, and the program of the present invention, the following effects can be obtained.

  When broadcasting information to a receiving terminal in an arbitrary geographical area, the transmitting terminal transmits a packet to the forwarding node using the prefix part of the destination address as the prefix of the network in which the forwarding node is accommodated, and the forwarding node. Since the packet is transferred from the node to the receiving terminal, the transmitting terminal can transmit the packet to the receiving terminal accommodated in any network in the world. Furthermore, this effect can increase the number of receiving terminals that can be transmitted by the transmitting terminal, thereby enhancing the effect of information to be broadcast.

  For example, even if the sender using the sending terminal broadcasts the requested advertisement, it can be sent to a large number of receiving terminals, so the effectiveness of the advertisement can be improved and the advertising revenue can be increased. When the advertisement of the product sold by the sender is broadcast, the effect of expanding the sales of the product to be advertised can be expected.

  Even if there are multiple transmitting terminals, the receiving terminal is configured to receive a packet only from the forwarding node. Therefore, regardless of the number of transmitting terminals, the receiving terminal is only encrypted with the forwarding node. It is only necessary to share information about keys and security protocols, and secure communication can be realized.

  Since the forwarding node converts the destination address of the packet sent from the sending terminal and forwards it to the receiving terminal, the address that can reach the receiving terminal for the information sender using the sending terminal Can be concealed. Therefore, it is possible to protect the privacy of the user of the receiving terminal with respect to the sender, and the user of the receiving terminal can safely acquire meaningful information such as store information and administrative information around the residential area, or an emergency alert. be able to.

  The forwarding node is configured to convert the destination address of the packet sent from the transmitting terminal from the address of the GBA structure set by the transmitting terminal to the normal IP address of the receiving terminal. The packet receiving unit can be configured with only a general IPv6 communication function. As a result, for example, a general PC (Personal Computer) that is widely used can be mounted very easily as a receiving terminal of the present invention.

  In addition, due to the above effects, forwarding node operators can provide services that are attractive to senders and receivers of information, so they can obtain usage fees for forwarding services from senders and receivers of information. can do.

  Hereinafter, preferred embodiments of an information broadcast system, an information broadcast method and a program thereof according to the present invention will be described with reference to the accompanying drawings. First, features of the information broadcast system according to the present invention will be described.

An information broadcast system according to the present invention is configured to use IPv6 (Internet) in a plurality of transmission terminals and reception terminals connected via a network.
This is an information broadcasting system that performs broadcast communication using Protocol Version 6), and uses a destination address of a packet to be transmitted to a receiving terminal in a region arbitrarily intended by a transmitting terminal, using geographical range information intended as a destination. By configuring, the same information can be broadcasted to a plurality of receiving terminals existing in the geographical range.

In such an information broadcast system, the present invention is configured to transmit a packet from the transmission terminal to the reception terminal via the forwarding node.
(1) It is possible to indirectly set the destination address of the receiving terminal of the broadcast destination that the transmitting terminal wishes to broadcast regardless of the network in which the receiving terminal is accommodated.
(2) It has a feature that it is possible to realize secure communication such as blocking packet transmission from an unauthorized transmission terminal and preventing falsification of transmission contents. Furthermore, by using such a forwarding node, it is possible to increase the number of receiving terminals that can broadcast information.

[Configuration of the first embodiment]
Next, the configuration of the first embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a network configuration diagram showing the configuration of the first embodiment of the information broadcasting system according to the present invention.

  Referring to FIG. 1, an information broadcast system 50 according to the first embodiment of the present invention includes a transmission terminal 1, a forwarding node 2, and a plurality of reception terminals 3, that is, reception terminals 3a, 3b, 3c. The transmission terminal 1, the forwarding node 2, and the reception terminals 3a, 3b, and 3c are connected via the network 10, respectively. Here, the number of transmission terminals 1 is not limited to one, and a plurality of transmission terminals 1 may exist. Further, it is assumed that the receiving terminals 3a and 3b exist within the same designated geographical area designated by the transmitting terminal 1, but the receiving terminal 3c exists outside the designated geographical area.

  The transmission terminal 1 has functions necessary for general IPv6 communication, and as shown in FIG. 2, the position information acquisition unit 100, the transmission address generation unit 101, the transmission information configuration unit 102, and the storage unit 103 It is set as the structure further provided. FIG. 2 is a block diagram showing an example of the configuration of the transmission terminal 1 according to the present invention, and shows only the blocks necessary for the description of the present invention.

  In FIG. 2, the position information acquisition unit 100 has a function of acquiring a geographic range in which information is desired to be transmitted using an input device such as a keyboard or a mouse. Here, when using a keyboard, a method such as allowing the user to input an address, a zip code, and longitude / latitude can be used. When using a mouse, a method can be used in which a map image is presented to the user and a transmission range is designated by dragging the mouse. A combination of a keyboard and a mouse is also conceivable. For example, after inputting the radius of the transmission area with a keyboard, a method of clicking the center point with a mouse can be considered.

  The transmission address generating unit 101 receives the prefix acquired in advance from the service provider of the information broadcasting system 50 by e-mail or electronic mail whose security is ensured by encryption or the like, and the position information acquiring unit 100. A function for generating a destination address of the GBA structure based on the geographical range acquired in step (b) is provided.

The information broadcast system 50 uses IP (Internet Protocol) for information communication. In particular, it is assumed that IPv6 is used, and the destination address generated by the transmission address generation means 101 is shown in FIG. As described above, in the 128-bit address, the prefix acquired in advance is used for the upper 64-bit prefix part, and the positional information is configured based on the geographical range information to be transmitted for the lower-order 64-bit interface ID part. Is stored. The address configured in this manner is hereinafter referred to as GBA (Geographical).
It is expressed as an address of a (Basic Address) structure. FIG. 5 is a block diagram showing an example of assignment of components of the IPv6 address.

  The prefix of the GBA structure address is a prefix categorized into a global unicast address, and matches the prefix of the network in which the forwarding node 2 described later is accommodated. Thereby, the packet transmitted by the transmission terminal 1 can reach the network in which the forwarding node 2 is accommodated.

Next, a configuration example of the geographical range information to the interface ID portion of the address of the GBA structure in the first embodiment of the present invention will be shown. In the configuration example here, the center position of the geographical range is represented by longitude and latitude. For example, if the accuracy is about 12 m, the latitude / longitude corresponds to an accuracy of 0.4 seconds. At this time, the number of bits necessary for expressing latitude and longitude is as follows, which is 43 bits in total.
Latitude: 180 degrees x 60 minutes x (60 / 0.4) = 1620000
= 21 bits
Longitude: 360 degrees x 60 minutes x (60 / 0.4) = 3240000
= 22 bits

  Therefore, the remaining 21 bits of the 64-bit interface ID part are assigned 5 bits for mode information and 16 bits for area information, respectively, so that the configuration shown in FIG. 6 is obtained. FIG. 6 is a configuration diagram showing an example of assignment of components to the interface ID portion of the GBA structure address in the present invention. At this time, the mode information is used for determining a method for setting a geographic range, and is used for, for example, determining interpretation of area information described later. Specifically, whether the area information is interpreted as the length of one side of the rectangular area or the radius in the circular area.

  One area information indicates a geographical range. For example, when the length is interpreted as the length of one side of a rectangular area by mode information, and the latitude / longitude is 12 m, the above-described longitude / latitude is used. A geographical range of about 800 km square can be designated centering on the set position. In the above example, the accuracy of latitude / longitude / geographic range is 12 m. However, the accuracy may be arbitrarily set using mode information.

  The transmission information constituting unit 102 constitutes transmission information by using character information input from an input device such as a keyboard or video information or audio information stored in the storage unit 103. It is effective that this transmission information is information strongly related to the transmission area. For example, store-related information, medical-related information, administrative-related information, etc. around the transmission area can be considered.

  At this time, the operator of the transmission terminal 1 can obtain an advertisement fee and an information notification commission fee from a store or an administrative agency. In addition, when the operator of the transmission terminal 1 is a store manager, the sales promotion effect of the product can be expected by transmitting an advertisement of the product sold by the operator.

The storage means 103 stores character information and video / audio information used when the transmission information forming means 102 composes the transmission information. In addition, the prefix information obtained from the operator of the forwarding node 2 may be stored in advance, and this prefix information may be used by the transmission address generation unit 101.

  Note that the communication between the transmission terminal 1 and the transfer node 2 needs to take security measures to encrypt and authenticate each other in order to prevent eavesdropping and malicious information transmission from a malicious third party. However, IPsec (IP Security: stipulated in IETF-RFC2401) implemented as a standard in the IPv6 stack can be used for this.

  For this reason, no special means for realizing secure communication is required, but another special encryption and authentication means may be used. When using IPsec, the shared key information is exchanged between the operator of the transmission terminal 1 and the operator of the transfer node 2 by a secure method such as mail, and both sides communicate with IPsec. It is necessary to set up to establish.

  Next, the configuration of the forwarding node 2 in FIG. 1 will be described. The forwarding node 2 has functions necessary for general IPv6 communication, and as shown in FIG. 3, the GBA packet receiving unit 200, the destination determining unit 201, the packet duplicating unit 202, and the position correspondence setting unit 203 and a storage unit 204 are further provided. FIG. 3 is a block diagram showing an example of the configuration of the forwarding node 2 according to the present invention, and shows only the blocks necessary for explaining the present invention.

In FIG. 3, the GBA packet receiving unit 200 has a function of capturing a packet that matches the prefix notified to the transmitting terminal 1 in advance by the prefix part of the destination address having the GBA structure. When the GBA packet receiving unit 200 receives a packet for address resolution of an address having the prefix, such as ARP (Address Resolution Protocol) or NDP (Neighbor Discovery Protocol), from another terminal, the forwarding node 2 link layer address (MAC (Media
(Access Control) address) is notified to the terminal that sent the packet for address resolution, so that all packets addressed to the address having the prefix can be sent to the forwarding node 2. However, for the forwarding node 2, when the forwarding node 2 of the network serving as the prefix is operating as a router, the function of drawing the prefix into its own node is not required.

  The destination determination unit 201 refers to the position-address correspondence table 7 shown in FIG. 7 stored in the storage unit 204, and receives the position information registered in the position information field 71 of the position-address correspondence table 7 as an input packet. It is determined whether or not it is included in the geographic range of the geographic range information stored in the interface ID section, and for the receiving terminal determined to be in the geographic range, the transmitting terminal 1 of the packet is further determined by the receiving terminal. A function is provided for determining whether or not the packet transmission for the receiving terminal is permitted by the reception permission field 73 of the position-address correspondence table 7. As a result, the destination determining unit 201 selects a receiving terminal that is within the geographical range of the geographical range information stored in the destination address of the received packet and that permits packet transmission from the transmitting terminal 1 that is the transmission source of the packet. Then, the packet is determined as the transfer destination of the packet, and the corresponding reception address (destination address) is extracted from the reception terminal address field 72 of the position-address correspondence table 7. FIG. 7 is a table showing an example of the configuration of the position-address table 7 referred to for destination determination in the present invention, in which a receiving terminal to which an information broadcast packet is to be distributed is registered as transfer destination information. And stored in the storage means 204.

  Here, as the sender ID in the reception permission field 73 of the position-address correspondence table 7 of FIG. 7, for example, the IP address of the transmission terminal acquired from the transmission source address can be used. As described above, the secure communication can be performed between the transmission terminal 1 and the forwarding node 2 by IPsec, but in this case, since the third party cannot impersonate the transmission source address, the transmission source IP The sending terminal can be specified by the address. Alternatively, other information such as a shared key between the transmission terminal 1 and the forwarding node 2 may be used as the sender ID.

  Further, as in the second registration example of the position-address correspondence table 7 shown in FIG. 7, “*” (wild card) indicating that there is no transmission terminal that prohibits reception is set in the reception permission field 73. It is also possible to allow the transmission of information to all the transmission terminals 1. Furthermore, the reception permission field 73 may be configured as a reception prohibition target field. In this case, information transmission from the transmission terminal 1 corresponding to the sender ID described in this field is prohibited. Will be.

  When there are a plurality of receiving terminals determined to be transferred by the destination determining unit 201, the packet duplicating unit 202 transfers the packet sent from the transmitting terminal 1 to all the receiving terminals determined as the transfer target. A function of copying the packet for all receiving terminals and replacing the destination address of each copied packet with the address registered in the receiving terminal address field 72 as the receiving terminal to be transferred Is provided.

  The position correspondence setting unit 203 uses the position information stored in the storage unit 204 based on the position information registration notification transmitted from the receiving terminal 3 as a request for new registration or update registration to the position-address correspondence table 7. A function for adding / updating the address correspondence table 7 is provided. The location information registration notification stores the location information of the source receiving terminal 3 and the receiving terminal address. The location information registration notification can also store the identifier (sender ID) of the transmitting terminal that is permitted to transmit information to the receiving terminal 3. The identifier of the transmission terminal can be, for example, the address of the transmission terminal. Alternatively, a correspondence relationship between the address of the transmitting terminal and a sender code composed of a character string and a number is determined in advance, and a sender who is permitted to transmit information is designated by the sender code in the location information registration notification You may make it.

  The storage means 204 stores a position-address correspondence table 7 shown in FIG. As described above, this position-address correspondence table 7 is added / updated by the position correspondence setting unit 203 and is referenced by the destination determination unit 201.

  Here, as described above, the forwarding node 2 can realize secure communication with IPsec that holds the shared key with the transmission terminal 1, but similarly, the forwarding node 2 shares the shared key with the receiving terminal 3. By exchanging, secure communication by IPsec can be realized between the forwarding node 2 and the receiving terminal 3.

  Next, the configuration of the receiving terminal 3 in FIG. 1 will be described. The receiving terminal 3 includes a function necessary for general IPv6 communication, and further includes a position information acquisition unit 300 and a position information registration unit 301 as shown in FIG. FIG. 4 is a block diagram showing an example of the structure of the receiving terminal 3 according to the present invention, and shows only the blocks necessary for explaining the present invention.

  In FIG. 4, the position information acquisition unit 300 has a function of acquiring position information by a device capable of detecting the position of the receiving terminal 3 such as GPS (Global Positioning System). In addition to GPS, the address or postal code where the receiving terminal 3 is located may be input using a keyboard. Or after showing a map image to a user, it is good also as designating the position where receiving terminal 3 was installed using pointing devices, such as a mouse.

  The location information registration unit 301 receives the location information of the reception terminal 3 acquired by the location information acquisition unit 300 and the reception terminal 3 in order to request new registration or update registration to the location-address correspondence table 7 of the forwarding node 2. And a function of transmitting a location information registration notification storing a sender ID permitting information transmission to the receiving terminal 3 to the transfer node 2. As described above, the sender ID may be an address of the transmission terminal 1 or a sender code composed of a character string or a number that can be easily understood by a person.

  In any case, the operator operating the forwarding node 2 presents the address of the transmission terminal 1, the sender code that can identify the transmission terminal 1, and the correspondence table of the sender name via the network or by mail. Thus, the receiver (the user of the receiving terminal 3) can select the transmitting terminal 1 (sender operating the transmitting terminal) that is permitted to transmit information. The location information registration notification may be transmitted in response to an operation of the user of the receiving terminal 3 when the transmitting terminal 1 that is permitted to receive is changed, or may be transmitted periodically. They may be good or they may be used together.

  As described above, each means constituting the transmitting terminal 1, the forwarding node 2, and the receiving terminal 3 in the first embodiment is assumed to be implemented by software, but may be implemented by hardware having similar functions. Of course, software and hardware may be mixed and implemented.

[Description of Operation of First Embodiment]
Consider a case where the transmission terminal 1 transmits a packet addressed to the geographic area AREA_A as shown in FIG. 8 as the designated geographic area specified in the geographic area information of the packet. Here, as in FIG. 1, it is assumed that the receiving terminal 3 a and the receiving terminal 3 b exist within the geographical area of AREA_A, and the receiving terminal 3 c exists outside the geographical area of AREA_A. The receiving terminal 3a, the receiving terminal 3b, and the receiving terminal 3c all have the same configuration as the receiving terminal 3 shown in FIG. FIG. 8 is a network configuration diagram for explaining the operation of the information broadcast system 50 in the first embodiment of the present invention.

  In FIG. 8, the procedure until the packet addressed to the geographic area AREA_A transmitted from the transmission terminal 1 reaches the reception terminal 3a and the reception terminal 3b will be described with reference to the flowcharts of FIGS. FIG. 9 is a flowchart for explaining an example of the operation on the transmission terminal 1 side that transmits a packet addressed to the geographic area AREA_A to the forwarding node 2, and FIG. 10 shows a received packet addressed to the geographic area AREA_A. Is a flowchart for explaining an example of the operation on the transfer node 2 side for transferring the message to the corresponding receiving terminals 3a and 3b.

  First, prior to all operations described below, the forwarding node 2 notifies the transmitting terminal 1 of a prefix that ensures reachability to the forwarding node 2 in advance. Based on the premise that such notification has been made, the procedure until a packet is transmitted from the transmission terminal 1 will be described with reference to the flowchart of FIG.

  The transmission terminal 1 configures transmission data with character information and video information to be transmitted (step a1). Next, the geographic area AREA_A as the transmission destination is acquired by input from a keyboard or the like (step a2). Furthermore, a destination address having a GBA structure is generated from the prefix acquired in advance from the operator operating the forwarding node 2 and the information of the geographic area AREA_A as the transmission destination (step a3). Finally, the packet created in step a1 is transmitted via the network 10 to the forwarding node 2 indicated by the destination address generated in step a3 (step a4).

  Here, since the prefix of the destination of the packet transmitted from the transmission terminal 1 matches the prefix of the network to which the forwarding node 2 belongs, as described above, in the network 10, forwarding of a normal IPv6 router is performed. By the function, it can finally be delivered to the network to which the forwarding node 2 belongs. As described above, the forwarding node 2 operates to respond to the ARP and NDP for address resolution with respect to all destination addresses having the prefix so as to forward it to itself. The packet transmitted from is received by the forwarding node 2. When the forwarding node 2 operates as a router that accommodates the network serving as the prefix, the packet from the transmission terminal 1 is input without responding to the ARP or NDP.

  For communication between the transmission terminal 1 and the forwarding node 2, for example, IPsec, which is a general security protocol, can be used for authentication, prevention of tampering and wiretapping. For this purpose, it is necessary to exchange a common key between the transmission terminal 1 and the forwarding node 2 in advance and to make settings for establishing secure communication with each other.

  Next, a procedure from when a packet transmitted from the transmission terminal 1 is received by the forwarding node 2 until it is finally transmitted to the reception terminal 3a or the reception terminal 3b will be described with reference to the flowchart of FIG.

  First, when the forwarding node 2 receives the packet (step b1), the forwarding node 2 examines the prefix part of the destination address of the GBA structure of the received packet, and the prefix that the prefix part has notified the transmitting terminal 1 in advance. (Step b2), if it matches (YES in step b2), it is determined that the destination address is an address of the GBA structure addressed to the forwarding node 2, and the process proceeds to step b3. To do.

  On the other hand, if it is determined that the address is not the GBA structure address addressed to the forwarding node 2 (NO in step b2), the process is terminated. In this case, the received packet may be discarded or transferred to an appropriate destination.

  If it is determined in step b2 that the address is in the GBA structure addressed to the forwarding node 2, the receiving terminal address conforming to the geographical range information stored in the interface ID portion of the destination address of the received packet is shown in FIG. The position-address correspondence table 7 is used for retrieval. Further, at this time, the reception permission field 73 of the position-address correspondence table 7 is also taken into consideration, and the reception terminal address to be transmitted is searched (step b3). Here, it is assumed that the receiving terminal 3a and the receiving terminal 3b meet the condition that transmission of a packet from the transmitting terminal 1 is permitted, and they are determined as receiving terminals to be transmitted.

  Next, the packet sent from the transmitting terminal 1 is duplicated, and the destination address is further replaced with the address of the receiving terminal to be transmitted in step b3 (step b4), and the duplicated packet is received by the receiving terminal 3a, Each is transmitted to the receiving terminal 3b (step b5). Here, first, a packet is transmitted to the address Raddr_a of the receiving terminal 3a. Thereafter, it is determined whether or not there is still a receiving terminal to be transmitted (step b6). If it remains (NO in step b6), the process is repeated from step b4, and if it does not remain (step b6). YES), the process is terminated. Since the receiving terminal 3b still remains under the above-mentioned assumptions, a packet is transmitted to the address Raddr_b of the receiving terminal 3b, and the process ends.

  Here, the communication between the forwarding node 2 and the receiving terminal 3a and between the forwarding node 2 and the receiving terminal 3b is, for example, a general security protocol for authentication, prevention of tampering and wiretapping, respectively. IPsec can be used. For this purpose, it is necessary to exchange a common key in advance between the forwarding node 2 and the receiving terminal 3a, and between the forwarding node 2 and the receiving terminal 3b, and to set each other to establish secure communication. .

  At this time, in the configuration of the first exemplary embodiment of the present invention, the forwarding node 2 needs to share the common key by the number of the transmitting terminal 1 and the receiving terminal 3, that is, the receiving terminals 3a, 3b, and 3c. However, the forwarding node 2 is generally considered to be able to secure a very large processing capacity and storage capacity under the management of the operator. On the other hand, the receiving terminal 3, that is, the receiving terminals 3a, 3b, and 3c are assumed to be terminals owned by general users and are assumed not to have a large processing capacity and storage capacity. 2 and the key exchange need only be shared with the transfer node 2, so that it is determined that the feasibility of secure communication is extremely high.

  As described in detail above, the following effects can be achieved in the first embodiment of the present invention.

  That is, when information is broadcast to the receiving terminal 3 in an arbitrary geographical area, the transmitting terminal 1 uses the prefix part of the destination address as the prefix of the network in which the forwarding node 2 is accommodated, and sends the packet to the forwarding node 2. Since the packet is transferred from the transfer node 2 to the receiving terminal 3, the transmitting terminal 1 transmits the packet to the receiving terminal 3 accommodated in any network in the world. The effect that it can do is acquired. Furthermore, because of this effect, the number of receiving terminals 3 that can be transmission targets can be increased, so that the effect of information to be broadcast can be enhanced.

  For example, even when the sender using the transmission terminal 1 broadcasts the requested advertisement, it can be transmitted to a large number of receiving terminals 3, so that the effectiveness of the advertisement can be enhanced and the advertising revenue can be increased. When the advertisement of the product sold by the sender itself can be broadcast, the effect of expanding the sales of the product to be advertised can be expected.

  Even if there are a plurality of transmitting terminals 1, the receiving terminal 3 receives packets from only the forwarding node 2. Therefore, regardless of the number of transmitting terminals 1, the receiving terminal 3 It is only necessary to share information on the encryption key and the security protocol between the two, and secure communication can be easily realized.

  In addition, since the forwarding node 2 converts the destination address of the packet sent from the transmission terminal 1 and forwards the packet to the reception terminal 3, the reception node 3 is notified to the information sender who uses the transmission terminal 1. Addresses that can be reached can be concealed. Thus, the privacy of the user of the receiving terminal 3 can be protected against the sender, and the user of the receiving terminal 3 can safely store meaningful information such as store information and administrative information around the residential area or emergency alerts. Can be acquired.

  Further, the forwarding node 2 is configured to convert the destination address of the packet sent from the transmission terminal 1 from the address of the GBA structure set by the transmission terminal 1 to the normal IP address of the reception terminal 3. The packet receiving unit of the receiving terminal 3 can be configured only with a general IPv6 communication function. As a result, for example, a general PC (Personal Computer) that is widely used can be mounted very easily as the receiving terminal 3 of the present invention.

  In addition, due to the above effects, the operator of the forwarding node 2 can provide an attractive service for the sender and receiver of the information, so the usage fee for the forwarding service is charged by the sender and receiver of the information. Can be acquired.

[Configuration of Second Embodiment]
Next, the configuration of the second embodiment of the present invention will be described in detail with reference to the drawings. The second embodiment of the present invention has a configuration in which mobility is further given to the receiving terminal in the first embodiment. That is, an example is described in which a packet transmitted from the transmission terminal 1 can be reached even when the reception terminal moves. FIG. 11 is a network configuration diagram showing the configuration of the second embodiment of the information broadcasting system according to the present invention.

  Referring to FIG. 11, an information broadcast system 50A according to the second embodiment of the present invention includes a transmission terminal 1, a forwarding node 2, a plurality of reception terminals 3, and a mobile reception terminal 4. The forwarding node 2, the receiving terminal 3, and the mobile receiving terminal 4 are connected via a network 10, respectively. That is, the information broadcast system 50A in FIG. 11 has the same configuration and the same operation with respect to the transmission terminal 1, the forwarding node 2, the reception terminal 3, and the network 10 in the information broadcast system 50 in FIG. However, only the mobile receiving terminal 4 is different from the information broadcasting system 50 of FIG. Here, the number of transmission terminals 1 and mobile reception terminals 4 is not limited to one, and a plurality of transmission terminals 1 and mobile reception terminals 4 may exist. In addition, it is assumed that the receiving terminal 3 exists within the designated geographic area designated by the transmitting terminal 1, but the mobile receiving terminal 4 has moved from outside the designated geographic area into the designated geographic area.

  Next, the configuration of the mobile reception terminal 4 in FIG. 11 will be described. The mobile reception terminal 4 has functions necessary for general IPv6 communication, and further includes a location information acquisition unit 400, a location information registration unit 401, and a movement determination unit 402 as shown in FIG. Has been. FIG. 12 is a block configuration diagram showing an example of the configuration of the mobile reception terminal 4 according to the present invention, and shows only the blocks necessary for the description of the present invention.

  In FIG. 12, the position information acquisition means 400 has the same function as the position information acquisition means 300 shown in FIG. 1 of the first embodiment. However, in this case, it is preferable to use the one that can automatically obtain the latest position information, such as GPS, for obtaining the position information.

  The location information registration unit 401 also has the same function as the location information registration unit 301 shown in FIG. 1 of the first embodiment, but the location information registration unit 401 in the second embodiment periodically updates the location information. Not only is the registration notification transmitted to the forwarding node 2, but also a function of transmitting a location information registration notification triggered by a notification from the movement determination means 402 described later is different.

  The movement determination unit 402 calculates a movement distance from the position information obtained by the position information acquisition unit 400, and the transfer node is triggered when the movement distance becomes larger than a predetermined movement distance, that is, a distance set in advance. 2 is provided with a function of notifying the location information registration means 401 so that a location information registration notification to 2 is transmitted. Further, the movement determination unit 402 monitors the address of the communication interface of the mobile reception terminal 4 and transmits the position information registration notification to the forwarding node 2 when the change of the address is detected. A function of notifying the registration unit 401 is provided.

  With the mobile reception terminal 4 having such a configuration, even when the mobile reception terminal 4 moves, it is possible to receive a packet sent to a geographical range including the movement destination. The mobile reception terminal 4 according to the second embodiment of the present invention can coexist with the reception terminal 3.

[Fields where the present invention can be used]
According to the present invention, information that depends on the geographical area (for example, product advertisements for bargains in a specific area, advertisements for bargains, information on local administrations, evacuation warnings to disaster areas, etc.) resides in the specific area concerned. Therefore, the present invention can be suitably applied to a use for broadcasting to a recipient.

  The configuration of the preferred embodiment of the present invention has been described above. However, it should be noted that such examples are merely illustrative of the invention and do not limit the invention in any way. Those skilled in the art will readily understand that various modifications and changes can be made according to a specific application without departing from the gist of the present invention.

It is a network block diagram which shows the structure of the 1st Example of the information broadcasting system by this invention. It is a block block diagram which shows an example of a structure of the transmission terminal by this invention. It is a block block diagram which shows an example of a structure of the forwarding node by this invention. It is a block block diagram which shows an example of a structure of the receiving terminal by this invention. It is a block diagram which shows an example of allocation of the component of an IPv6 address. It is a block diagram which shows the example of allocation of the component with respect to the interface ID part of the address of the GBA structure in this invention. It is a table which shows an example of the structure of the position-address table referred for the destination determination in this invention. It is a network block diagram for demonstrating operation | movement of the information broadcast system in 1st Example of this invention. It is a flowchart explaining an example of operation | movement by the side of the transmission terminal which transmits the packet addressed to a specific geographical area with respect to a forwarding node. It is a flowchart explaining an example of the operation | movement by the side of the forwarding node which transfers the packet addressed to the specific geographical area to the applicable receiving terminal. It is a network block diagram which shows the structure of the 2nd Example of the information broadcasting system by this invention. It is a block block diagram which shows an example of a structure of the mobile reception terminal by this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Transmission terminal 2 Forwarding node 3, 3a, 3b, 3c Reception terminal 4 Mobile reception terminal 7 Location-address correspondence table 10 Network 50, 50A Information broadcast system 71 Location information field 72 Reception terminal address field 73 Reception permission field 100 Location information Acquisition means 101 Transmission address generation means 102 Transmission information configuration means 103 Storage means 200 GBA packet reception means 201 Destination determination means 202 Packet duplication means 203 Position correspondence setting means 204 Storage means 300 Position information acquisition means 301 Position information registration means 400 Position information acquisition Means 401 Position Information Registration Means 402 Movement Determination Means

Claims (19)

One or a plurality of transmitting terminals and one or a plurality of receiving terminals are connected via a network, and IPv6 (Internet) is provided to a receiving terminal within a geographical range arbitrarily designated from the transmitting terminal.
An information broadcasting system for broadcasting information as a packet using Protocol Version 6), which is connected to the network and receives the information broadcasting packet transmitted by the transmitting terminal and transmits the packet. A forwarding node for forwarding to a receiving terminal to be transmitted, and when the transmitting terminal performs information broadcasting to the receiving terminal in an arbitrary geographical area, the transmitting terminal transmits a destination address of the packet for information broadcasting The GBA (Geographical) has a prefix part as a prefix of a network in which the forwarding node is accommodated, and an interface ID part of a destination address of the packet as geographical range information indicating a geographical range of the receiving terminal as a broadcast destination.
An information broadcasting system, wherein the packet is transmitted to the forwarding node as an address of a Based Address structure.   The forwarding node includes a correspondence table in which at least a destination address of the receiving terminal and location information are registered in advance as forwarding destination information for each receiving terminal, and when the packet for information broadcast is received from the transmitting terminal, By indexing the position information for each receiving terminal in the correspondence table, the receiving terminal existing in the geographical range indicated by the geographical range information set in the interface ID portion of the destination address of the packet is identified, and the corresponding reception is performed. 2. The information broadcast system according to claim 1, wherein a destination address of the terminal is extracted from the correspondence table, and the received packet is transferred to the receiving terminal by rewriting the destination address of the packet. .   When the forwarding node refers to the correspondence table and detects that there are a plurality of receiving terminals to which the packet for information broadcast received from the sending terminal is to be forwarded, the forwarding node 3. The method according to claim 2, wherein the required number of copies is duplicated, the destination address of each receiving terminal extracted from the correspondence table is set in each duplicated packet, and the packet is transferred to each receiving terminal. Information broadcast system.   The forwarding node further registers, as the forwarding destination information in the correspondence table, a transmitting terminal that permits or prohibits reception of a packet for each receiving terminal in advance, and the information broadcast packet received from the transmitting terminal Whether or not the receiving terminal is a packet from a transmitting terminal registered in the correspondence table as reception permission or reception prohibition when detecting the reception terminal to be transferred by indexing the correspondence table based on the geographical range information The information broadcast system according to claim 2 or 3, wherein if the packet is from a transmission terminal permitted to receive the packet, the packet is transferred to the reception terminal.   The forwarding node can register that there is no sending terminal that prohibits the reception of a packet when registering a sending terminal that permits or prohibits the reception of a packet as the forwarding destination information of the correspondence table. 5. The information broadcasting system according to claim 2, wherein the information broadcasting system is characterized in that:   6. The information according to claim 2, wherein the forwarding node sets the destination address of the receiving terminal registered in the correspondence table as a normal IPv6 address that does not use geographic range information. Information system.   When the receiving terminal newly registers the forwarding destination information in the correspondence table of the forwarding node, or when updating the forwarding destination information already registered, the receiving terminal newly registers or updates the forwarding node. 7. The information broadcast system according to claim 2, wherein a registration notification for requesting registration is transmitted.   When the receiving terminal is a movable terminal, the registration notification is transmitted to the forwarding node periodically at a predetermined time interval or whenever a movement larger than a predetermined moving distance is detected. The information broadcast system according to claim 7, wherein   The IPsec (IP Security) protocol is used as a security protocol for communication between the transmitting terminal and the forwarding node and / or communication between the receiving terminal and the forwarding node. Information broadcast system in any one of 8 thru | or 8. One or a plurality of transmitting terminals and one or a plurality of receiving terminals are connected via a network, and IPv6 (Internet) is provided to a receiving terminal within a geographical range arbitrarily designated from the transmitting terminal.
An information broadcast method for broadcasting information as a packet using Protocol Version 6), which is connected to the network and receives the information broadcast packet transmitted by the transmitting terminal and transmits the packet. A forwarding node for forwarding to a receiving terminal to be transmitted, and when the transmitting terminal performs information broadcasting to the receiving terminal in an arbitrary geographical area, the transmitting terminal transmits a destination address of the packet for information broadcasting The GBA (Geographical) has a prefix part as a prefix of a network in which the forwarding node is accommodated, and an interface ID part of a destination address of the packet as geographical range information indicating a geographical range of the receiving terminal as a broadcast destination.
An information broadcast method characterized in that the packet is transmitted to the forwarding node as an address of a Based Address structure.   The forwarding node includes a correspondence table in which at least a destination address of the receiving terminal and location information are registered in advance as forwarding destination information for each receiving terminal, and when the packet for information broadcast is received from the transmitting terminal, By indexing the position information for each receiving terminal in the correspondence table, the receiving terminal existing in the geographical range indicated by the geographical range information set in the interface ID portion of the destination address of the packet is identified, and the corresponding reception is performed. 11. The information broadcast method according to claim 10, wherein a destination address of the terminal is extracted from the correspondence table, and the received packet is transferred to the receiving terminal by rewriting the destination address of the packet. .   When the forwarding node refers to the correspondence table and detects that there are a plurality of receiving terminals to which the packet for information broadcast received from the sending terminal is to be forwarded, the forwarding node 12. The method according to claim 11, wherein the required number of copies is duplicated, the destination address of each receiving terminal extracted from the correspondence table is set in each duplicated packet, and the packet is transferred to each receiving terminal. Information broadcast method.   The forwarding node further registers, as the forwarding destination information in the correspondence table, a transmitting terminal that permits or prohibits reception of a packet for each receiving terminal in advance, and the information broadcast packet received from the transmitting terminal Whether or not the receiving terminal is a packet from a transmitting terminal registered in the correspondence table as reception permission or reception prohibition when detecting the reception terminal to be transferred by indexing the correspondence table based on the geographical range information 13. The information broadcast method according to claim 11 or 12, wherein if the packet is from a transmission terminal permitted to receive the packet, the packet is transferred to the reception terminal.   The forwarding node can register that there is no sending terminal that prohibits the reception of a packet when registering a sending terminal that permits or prohibits the reception of a packet as the forwarding destination information of the correspondence table. The information broadcasting method according to claim 11, wherein the information broadcasting method is characterized in that:   15. The information according to claim 11, wherein the forwarding node sets the destination address of the receiving terminal registered in the correspondence table as a normal IPv6 address that does not use geographic range information. Reporting method.   When the receiving terminal newly registers the forwarding destination information in the correspondence table of the forwarding node, or when updating the forwarding destination information already registered, the receiving terminal newly registers or updates the forwarding node. 16. The information broadcasting method according to claim 11, wherein a registration notification requesting registration is transmitted.   When the receiving terminal is a movable terminal, the registration notification is transmitted to the forwarding node periodically at a predetermined time interval or whenever a movement larger than a predetermined moving distance is detected. The information broadcast method according to claim 16, wherein:   11. The IPsec (IP Security) protocol is used as a security protocol for communication between the transmitting terminal and the forwarding node and / or communication between the receiving terminal and the forwarding node. 18. An information broadcasting method according to any one of items 17 to 17. 19. An information broadcast program characterized in that the information broadcast method according to claim 10 is realized as a program executable by a computer.

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