KR100407175B1 - Method and apparatus for transmitting explict multicast data packet over mobile network - Google Patents

Abstract

The present invention relates to an explicit multicast service method and apparatus in a mobile IP network for implementing explicit multicast in a mobile IP network providing mobility of nodes in the Internet. The present invention receives a first explicit multicast data packet having an original network address of multiple mobile nodes as a recipient address, wherein the mobile node has an original network address in the original network, and multiple mobiles corresponding to the original network address. Determining the forward address of the node and determining the next transmission path of the first explicit multicast data packet according to the determined forward address, and having a recipient address as the original network address of the mobile node located on the determined next path. Generating an explicit multicast data packet, generating a packet header having the determined forward address of the mobile node on the next path as the recipient address, and then encapsulating the second explicit multicast data packet to generate the third explicit multicast data packet. Generating a third explicit multicast data packet to a whole address within the third explicit multicast data packet. Provides a method and apparatus for explicit multicast service in the IP network.

Description

TECHNICAL AND APPARATUS FOR TRANSMITTING EXPLICT MULTICAST DATA PACKET OVER MOBILE NETWORK}

The present invention relates to a method and apparatus for an explicit multicast service in a mobile IP network, and more particularly, to specify in a mobile IP network for implementing explicit multicast in a mobile IP network providing mobility of nodes in the Internet. The present invention relates to a multicast service method and apparatus.

Mobile IP is a host terminal or host node that is regularly connected to one network (home network) that is temporarily connected to another network (foreign network) and still receives IP packets or messages delivered to the host from addresses within the home network. It is a technique to receive.

These host terminals, which change their network attachment point, are known as mobile nodes, and these mobile nodes still need to be connected to a so-called home agent in the home network in order to still receive IP packets within the foreign network. You must register.

In registering with its original network delegate, the mobile node provides the original network delegate with a care-of address that can be addressed in its foreign network.

Here, when the address of the foreign network agent (foreign agent) on the external network is used as the whole school address, the whole school address is called a foreign agent care-of address, and an independent address is assigned and used in the foreign network. This is called a co-located care-of address.

The originating network agent monitors the traffic in the home network, intercepts the identified IP packet after identifying the IP packet carrying the destination address corresponding to the home address of the mobile node in the home network.

The originating network agent then forwards the intercepted IP packet to the mobile node in the current of the foreign network.

Such a mobile IP is a technology standardized by the Internet Technology Standardization Organization Internet Engineering Task Force (IETF). The mobile IP in the Internet version 4 is described in the standard document RFC2002, and the mobile IP in the Internet version 6 IPv6 is described in a standard proposal document (draft-ietf-mobileip-ipv6-14.txt).

A mobile IP service according to the internet version will be described with reference to the accompanying drawings.

1 is a diagram schematically illustrating a mobile IP service in Internet version 4, and FIG. 2 is a diagram schematically showing a mobile IP service in Internet version 6.

Referring to FIG. 1, when the first mobile node 100-1 leaves the home network and visits one of the foreign networks, the first mobile node 100-1 may determine the foreign network agent 110 of the visited foreign network. The router information is used to assign a school address.

At this time, the first mobile node 100-1 assigned the school address registers the school address assigned to the original network agent 120 and the external network agent 110.

On the other hand, the second mobile node 100-2, which is not connected to a certain external network agent of the foreign network, is assigned an address by another method not defined by the mobile IP (for example, DHCP (Dynamic Host present in the foreign network). Configuration Protocol) to assign a common local school address from a server (not shown).

Here, the DHCP server is a server for allocating an IP address to a node to which the Internet is to be connected.

The second mobile node 100-2 registers the common area whole school address assigned to the original network agent 120.

Subsequently, the original network agent 120 may determine the first or second mobile node 100-1, 100-2 from the counterpart node 130, which is an Internet node communicating with the first or second mobile node 100-1, 100-2. When a data packet having an original network address is received, the first or second mobile node 100-1, 100-2 is identified by the destination address of the received data packet.

The originating network agent 120 determines whether the school address corresponding to the identified first or second mobile node 100-1, 100-2 is registered, and uses the tunneling technique to transfer the received data packet to the registered school address. To pass.

Subsequently, the external network agent 110 having the external network proxy forwarding address decapsulates the tunnel information from the data packet transmitted through the tunneling technique, thereby deriving the first mobile node 100-1 having the external network proxy forwarding address. To send.

Meanwhile, the second mobile node 100-2 checks the data packet from the counterpart node 130 by removing the tunnel information from the data packet received from the original network agent 120 through the tunneling technique.

Here, the second mobile node 100-2 has a function of removing tunnel information from a data packet transmitted through the tunneling technique.

When the first mobile node 100-1 wants to transmit a data packet to the counterpart node 130, the external network agent 110 is used as the gateway router.

In the Internet version 6, the mobile IP service, as shown in Fig. 2, leaves the original network and visits one of the external networks, and the first and second mobile nodes 200-1,200-2 are assigned a DHCP address by a DHCP server. Has

At this time, the first and second mobile nodes 200-1 and 200-2 perform binding for informing the original network delegate 210 of the assigned common area whole school address. Here, binding is the same term as registration in Internet version 4.

In Internet version 6, all nodes connected to the Internet as well as the originating network agent support a binding function that associates the original address with the common area transit address of the first or second mobile node 200-1,200-2.

There are two methods of transmitting data packets to the first mobile node 200-1 or the second mobile node 200-2 to which a certain Internet node is bound.

First, the originating network agent 210 receives a data packet from the counterpart node 220 and determines a common area whole address of the first or second mobile node 200-1, 200-2 through the received data packet.

Subsequently, the original network agent 210 transmits the data packet to the common area whole address of the first or second mobile node 200-1, 200-2 by using a tunneling technique.

The first or second mobile nodes 200-1 and 200-2 having the common area whole address check the data packet from the counterpart node 220 by removing the tunnel information from the data packet transmitted through the tunneling technique. .

Second, since the counterpart node 220 has a binding function, the counterpart node 220 can grasp the common area whole address of the first or second mobile node 200-1, 200-2, and the routing extension header is added to the routing extension header of the data packet. The data packet including the common area whole address and the original network address of the first or second mobile node 200-1, 200-2 is transmitted at the same time.

The data packet transmitted by the counterpart node 220 does not go through the original network delegate 210 by the common area whole address of the first or second mobile node 200-1, 200-2 in the routing extension header. Directly sent to the second mobile node (200-1, 200-2).

In general, multicast technology is a technology that delivers data packets without time difference between receivers while reducing the bandwidth required for transmission and increasing network efficiency when there are many data receivers in the network that need to simultaneously receive the same data.

Internet multicast technology is largely the first, Host group model multicast based on RFC 1112, the IETF standard document, and the second IETF standard proposal draft-oomx- Explicit Multicast based on xcast-basic-spec-xx.txt.

In the host group model multicast, a plurality of subscribers wishing to receive data transmit a join signal, which is a service providing request signal, through each terminal to a router connected to the terminal.

The top-level router connected to the service provider's terminal remembers the link to the subroutine sending the subscription signal. The top-level router connected to the service provider's terminal and the router connected to the subscriber terminal have received the subscription signal. Remember only links.

The highest level router duplicates the data packet received from the service provider terminal by the number of links to which the subscription signal has been transmitted, and forwards the duplicated data packet to each link.

Host group multicast configured and operated as described above requires an advanced signaling that must receive a join signal from subscribers in order to define a group to provide a service.

In addition, the host group multicast service has a problem in that a link for transmitting a subscription signal of a plurality of subscribers in a router must be stored for each group address.

In addition, since the host group multicast service does not manage each subscriber separately, but only the group, the host group multicast service is very vulnerable to user authentication or billing.

To solve this problem, explicit multicast service has been proposed.

Explicit multicast services are described with reference to the accompanying drawings.

3 is a schematic block diagram of an explicit multicast service, and FIGS. 4A to 4E are diagrams showing data packet types according to explicit multicast in Internet version 4, and FIGS. 5A to 5E are explicit in Internet version 6 A diagram illustrating a data packet type according to multicast.

Referring to FIG. 3, first, the service provider 300 directly receives a join signal for request for a certain service from the first to third subscribers 310-1, 310-2, and 310-3.

The service provider 300 identifies the subscriber for providing the service by the received join signal, and transmits the first data packet of the service to be provided to the identified subscriber through the service providing terminal 320.

Here, the identified subscriber's Internet address is explicitly listed in the destination address field of the first data packet.

That is, as shown in FIG. 4A, the first data packet transmitted by the service provider 300 through the service providing terminal 320 may include the Internet packet header 400, the explicit multicast header 410, and the data field ( 420).

The Internet packet header 400 includes a sender address field 402, a link local multicast address field 404, and the sender address field 402 and the link local multicast address field 404 consist of 32 bits.

Here, the link local multicast address recorded in the link local multicast address field 404 is an address for distinguishing explicit multicasts among multicasts.

The link local multicast address is any one of the multicast group addresses '244.0.0.0' to '239.255.255.255' designated to distinguish the multicast, and is an address given by a specific addressing authority.

The first router 330 determines the number of transmission paths of the first data packet by the first to third terminal internet addresses recorded in the explicit multicast header 410 of the first data packet as shown in FIG. 4A.

At this time, since the first router 330 has two determined transmission paths, the first router 330 duplicates the first data packet to generate second and third data packets.

The second data packet to be transmitted to the first and second subscribers 310-1 and 310-2 is sent from the sender address field 430, the link local multicast address field 432, and the first terminal internet as shown in FIG. 4B. An address field 434, a second terminal internet address field 436, and a data field 438.

Here, the sender address field 430 and the link local multicast address field 432 are included in the Internet packet header, and the first and second terminal internet address fields 434, 436 are included in the explicit multicast header.

In addition, the third data packet to be transmitted to the third subscriber 310-3 may include a sender address field 440, a link local multicast address field 442, and a third terminal internet address field (as shown in FIG. 4C). 444 and data fields 446.

Here, the sender address field 440 and the link local multicast address field 442 are included in the Internet packet header, and the third terminal internet address field 444 is included in the explicit multicast header.

The second router 340 determines the number of transmission paths by the first and second terminal internet addresses recorded in the explicit multicast header of the second data packet as shown in FIG. The second data packet is duplicated to generate fourth and fifth data packets.

Herein, the fourth data packet to be transmitted to the first subscriber 310-1 may include a sender address field 450, a link local multicast address field 452, and a first terminal internet address field (as shown in FIG. 4D). 454 and data field 456.

At this time, the originator address field 450 and the link local multicast address field 452 are included in the Internet packet header, and the first terminal Internet address field 454 is included in the explicit multicast header.

In addition, the fifth data packet to be transmitted to the second subscriber 310-2 may include a sender address field 460, a link local multicast address field 462, and a second terminal internet address field (as shown in FIG. 4E). 464 and data field 466.

The second router 340 transmits the fourth data packet to the first terminal 360-1 by the first terminal internet address of the fourth data packet as shown in FIG. 4D, and the fifth data packet as shown in FIG. 4E. 2 The fifth data packet is transmitted to the second terminal 360-2 by the Internet terminal address.

The third router 350 transmits the third data packet to the third terminal 360-3 by the third terminal internet address of the third data packet as shown in FIG. 4C.

Meanwhile, the explicit multicast service operation in the Internet version 6 is the same as in the Internet version 4, but the data packets generated by the first to third routers 330, 340, and 350 are different.

That is, a data packet in Internet version 6 includes an Internet packet header and a data field, and a routing extension header is included in the Internet packet header.

First, as shown in FIG. 5A, the first data packet transmitted by the service provider 300 through the service providing terminal 320 may include a sender address field 500, a link local multicast address field 502, and a first packet. A terminal internet address field 504, a second terminal internet address field 506, a third terminal internet address field 508 and a data field 510.

Here, the sender address field 500, the link local multicast address field 502 and the first to third terminal internet address fields 504, 506 and 508 are included in the Internet packet header, and the first to third terminal internet address fields 504, 506 and 508. ) Is included in the routing extension header.

As shown in FIG. 5B, the second data packet generated by the first router 330 and transmitted to the first and second terminals 360-1 and 360-2 may include a first terminal internet address field in the routing extension header. 520 and a second terminal internet address field 522, the rest of which is identical to FIG. 5A.

The third data packet generated by the first router 330 and transmitted to the third terminal 360-3 may include a third terminal internet address field in a routing extension header included in the internet packet header, as shown in FIG. 5C. 530 is included, and other configurations are the same as those in FIG. 5A.

In addition, the fourth data packet generated by the second router 340 and transmitted to the first terminal 360-1 has a first terminal internet address field 540 in the routing extension header as shown in FIG. 5D. It is included and the other structure is the same as FIG. 5A.

The fifth data packet generated by the second router 340 and transmitted to the second terminal 360-2 includes a second terminal internet address field 550 in the routing extension header, as shown in FIG. 5E. The rest of the configuration is the same as in FIG. 5A.

In order to perform an explicit multicast service operated as described above on a mobile IP network, there are the following problems.

First, in a typical explicit multicast service, the link-local multicast address does not have to be registered with the router, so in the mobile IP network, the original network delegate does not process data packets having an unregistered link-local multicast address as a destination address. Throw it away.

Second, in the mobile IP network, routing for transmitting data packets to the whole school address registered by the mobile node should be performed. However, general explicit multicast routing is performed according to the mobile node's original network address recorded in the destination address of the received data packet. Since routing is performed, data packets are not properly transmitted to mobile nodes in the external network.

Third, if you want to perform explicit multicast service by optimized route using binding information in Internet version 6, only original network address of mobile node is listed in order, so that explicit Multicast routing does not work.

Accordingly, the present invention has been made to solve the above-mentioned problems, and is an explicit multicast in a mobile IP network that encapsulates an explicit multicast data packet by an explicit multicast header having the mobile node's forward address as the destination address. Its purpose is to provide a cast service method and apparatus.

It is another object of the present invention to provide an explicit multicast service method and apparatus in a mobile IP network which encapsulates an explicit multicast data packet by a routing extension header having the forwarding address of the mobile node as the destination address.

It is still another object of the present invention to provide a mobile IP network that performs an explicit multicast service according to an explicit multicast data packet included in a routing extension header by using the mobile node's binding information. An explicit multicast service method and apparatus are provided.

1 is a schematic diagram of a mobile IP service in Internet version 4;

2 is a schematic representation of a mobile IP service in Internet version 6;

3 is a schematic diagram of an explicit multicast service.

4A through 4E illustrate data packet types according to explicit multicast in Internet version 4.

5A through 5E illustrate data packet types according to explicit multicast in Internet version 6.

6 is a schematic structural diagram of an explicit multicast service on a mobile IP network of Internet version 4 according to a first embodiment of the present invention;

7A-7G illustrate the configuration of explicit multicast data packets on a mobile IP network of Internet version 4 according to a first embodiment of the present invention.

8 is a flow chart for performing an explicit multicast service on a mobile IP network of Internet version 4 according to a first embodiment of the present invention.

9 is a schematic structural diagram of an explicit multicast service on a mobile IP network of Internet version 6 according to a second embodiment of the present invention.

10A to 10G illustrate the configuration of explicit multicast data packets on a mobile IP network of Internet version 4 according to a second embodiment of the present invention.

11 is a flow chart for performing an explicit multicast service on a mobile IP network of Internet version 6 according to a second embodiment of the present invention.

12 is a schematic structural diagram of an explicit multicast service apparatus using binding information on an Internet version 6 mobile IP network according to a third embodiment of the present invention;

13A-13G illustrate the configuration of explicit multicast data packets using binding information on an Internet version 6 mobile IP network according to a third embodiment of the present invention.

<Description of the code for the main part>

600: counter node 610: first router

620-1,620-2,620-3,620-4: first to fourth mobile nodes

630: the original network agent 640: the second router

650: external network delegate

The present invention for achieving the above objects receives a first explicit multicast data packet having the original network address of a plurality of mobile nodes as the recipient address, the mobile node having the original network address in the original network; After determining the forward address of the plurality of mobile nodes corresponding to the network address, the next forward path of the first explicit multicast data packet is determined based on the determined forward address, and the original network address of the mobile node located on the determined next path. Generate a second explicit multicast data packet having a recipient address as the receiver address, generate a packet header having the forwarding address of the mobile node on the determined path as the recipient address, and then encapsulate the second explicit multicast data packet 3 generate an explicit multicast data packet, and generate a third explicit multicast to the whole address in the third explicit multicast data packet The present invention provides an explicit multicast service method and apparatus in a mobile IP network for transmitting data packets.

Another feature of the present invention is to generate an explicit multicast data packet having as a recipient address a common local area address corresponding to the original network address of the multiple mobile nodes and the original network address of the multiple mobile nodes, and specify according to the common local area address. A method for transmitting an explicit multicast data packet, wherein a partner node connected to the mobile IP network having a binding function transmits an explicit multicast packet in the mobile IP network along an optimized path; In providing a device.

Another feature of the invention is a data signal comprising an explicit multicast data packet transmitted to a plurality of mobile nodes within a mobile IP network, wherein the explicit multicast data packet is sent to the mobile node with a first explicit multicast data packet. A first Internet packet header having a first sender address and a first link local multicast address field in which the Internet address of the node that transmits the message is recorded, the first explicit multicast data packet is obtained from the original network address of the mobile node. Has a first explicit multicast header in which the original network address of the mobile node located on the next transmission path of the first explicit multicast data packet is recorded, and the Internet address of the node transmitting the explicit multicast data packet. Internet packet having a second sender address field and a second link local multicast address field in which a message is recorded. Header, to a second explicit multicast header and providing a data signal transmitted in a wired or wireless manner, it characterized in that it comprises a data field which the care-of address of the mobile node located on the transmission path, and then recorded.

Another feature of the present invention is a data signal including an explicit multicast data packet transmitted from a counterpart node to a plurality of mobile nodes in a mobile IP network, where the partner node has a binding function, the explicit multicast data. The packet includes an Internet packet header and a data field, wherein the Internet packet header includes a sender address field in which the Internet address of the partner node is recorded, a link local multicast address field, a common localized global address list field of multiple mobile nodes, and a multiple mobile node. It provides a data signal transmitted by wire or wireless, characterized in that it comprises a routing extension header including an original network address list field.

Hereinafter, an explicit multicast service method and apparatus in a mobile IP network according to the present invention will be described in detail with reference to the accompanying drawings.

6 is a schematic structural diagram of an explicit multicast service on an Internet version 4 mobile IP network according to a first embodiment of the present invention, and FIGS. 7A to 7G are diagrams illustrating an Internet version 4 mobile according to the first embodiment of the present invention. A diagram illustrating the configuration of explicit multicast data packets on an IP network.

In general, an explicit data packet according to the Internet version 4 explicit multicast service comprises an Internet packet header, an explicit multicast header, and a payload.

Here, the Internet packet header includes a field in which a sender address and a link local multicast address are recorded, and the explicit multicast header includes a field in which an address of a receiver receiving a data packet is recorded.

At this time, the sender address field and the link local multicast address field of the Internet packet header have a 32-bit configuration.

Referring to FIG. 6, an explicit multicast service system on a mobile IP network of Internet version 4 according to the present invention includes a correspondent node 600, a first router 610, and first to fourth mobile nodes. (Mobile node) 620-1, 620-2, 620-3, 620-4, the original network agent (Home agent) 630, the second router 640 and the foreign network agent (Foreign agent) (650).

The counterpart node 600 is an internet node that performs internet communication with the first through fourth mobile nodes 620-1, 620-2, 620-3, 620-4 through the first router 610.

The original network delegate 630 is the first to fourth mobile nodes 620-1,620-2,620-3,620- in the home network to which the first to fourth mobile nodes 620-1,620-2,620-3,620-4 belong. A router that grasps the current access point of 4) and tunnels a data packet to be transmitted to the first to fourth mobile nodes 620-1, 620-2, 620-3, and 620-4.

The external network agent 650 refers to a router that provides routing services to the third and fourth mobile nodes 620-3 and 620-4 in a network visited by the third and fourth mobile nodes 620-3 and 620-4.

The second router 640 refers to a router that transmits an explicit multicast data packet received from the original network agent 630 to the first mobile node 620-1 and the second mobile node 620-2.

Here, the first to fourth mobile nodes 620-1, 620-2, 620-3, 620-4 move from the original network to the external network while communicating with the counterpart node 600, and the first and second mobile nodes 620-1, 620-. 2) obtains the common area whole school address in the visited network, and the third and fourth mobile nodes 620-3 and 620-4 obtain the outside network delegate whole school address in the visiting network.

In this case, the first to fourth mobile nodes 620-1, 620-2, 620-3, 620-4 register the obtained common area whole school address and the outside network delegate whole school address with the original network delegate 630.

The explicit multicast service operation on the mobile IP network according to the first embodiment of the present invention configured as described above will be described.

First, since the counterpart node 600 does not recognize that the first to fourth mobile nodes 620-1, 620-2, 620-3 and 620-4 have moved from the original network to the external network, the first to fourth mobile nodes are not recognized. Generates a first explicit multicast data packet that lists the original network address in the explicit multicast header and transmits it to the original network agent 630 through the first router 610.

Here, the first explicit multicast data packet includes an internet packet header 700, an explicit multicast header 710, and a data field 720, as shown in FIG. 7A.

The Internet packet header 700 includes a sender address field 702 and a link local multicast address field 704, with the sender address field 702 having a partner node 600 to which to send a first explicit multicast data packet. ) Is recorded.

In addition, in the link local multicast address field 704, a link local multicast address defined for distinguishing an explicit multicast among the predefined multicast group addresses for distinguishing multicasts is recorded.

Since the link local multicast address is a signaling address for the router among the addresses '244.0.0.0' to '239.255.255.255', the router receiving the data packet including the link local multicast address must receive the received data packet. It is recognized that this is an explicit multicast data packet.

Explicit multicast header 710 includes a field in which a recipient address for receiving explicit multicast data sent from partner node 600 is recorded, the first mobile node original network address field 712, the second mobile. A node original network address field 714, a third mobile node original network address field 716, and a fourth mobile node original network address field 718.

Here, the original network addresses of the first to fourth mobile nodes 620-1, 620-2, 620-3, 620-4 are Internet addresses in the original network.

When the first explicit multicast data packet as shown in FIG. 7A is received, the originating network agent 630 receives the first to fourth mobile nodes 620-1, 620-2, 620-3, 620 recorded in the explicit multicast header 710. The whole school addresses of the first to fourth mobile nodes 620-1, 620-2, 620-3 and 620-4 registered by the original network address of -4) are determined.

In this case, since the first and second mobile nodes 620-1 and 620-2 have a common local school address, and the third and fourth mobile nodes 620-3 and 620-4 have external network delegate whole school addresses, the original network The delegate 630 may include a second explicit data packet for transmission to the first and second mobile nodes 620-1 and 620-2 and a third for transmission to the third and fourth mobile nodes 620-3 and 620-4. Create an explicit data packet.

That is, the original network agent 630 records the original network addresses of the first and second mobile nodes 620-1 and 620-2 in the first explicit multicast header, and the first and second mobile nodes 620-1 and 620. Generate a second explicit multicast data packet by encapsulating the first explicit multicast data packet with a second explicit multicast header in which the common area whole address of -2) is recorded.

As shown in FIG. 7B, a counterpart node internet address is recorded in the originator address field 732 of the first internet packet header 730 of the second explicit multicast data packet, and the first explicit multicast header 740 is recorded. ), The first mobile node original network address and the second mobile node original network address are recorded.

In addition, the original network delegate address is recorded in the sender address field 752 of the second Internet packet header 750 of the second explicit multicast data packet, and the first mobile node in the second explicit multicast header 760. The common area whole address and the second mobile node common area whole address are recorded.

The original network delegate 630 records the original network addresses of the third and fourth mobile nodes 620-3, 620-4 in the first explicit multicast header 740, and the third and fourth mobile nodes 620-. A third explicit multicast data packet is generated by encapsulating the first explicit multicast data packet with a second explicit multicast header 760 that records the external network proxy address of 3,620-4).

As shown in FIG. 7C, a counterpart node Internet address is recorded in the originator address field 732 of the first Internet packet header 730 of the third explicit multicast data packet, and the first explicit multicast header 740 is recorded. ), The third mobile node original network address and the fourth mobile node original network address are recorded.

In addition, the original network delegate address is recorded in the sender address field 752 of the second Internet packet header 750 of the third explicit multicast data packet, and the third mobile node is written in the second explicit multicast header 760. The external network delegate address and the fourth mobile node external network proxy address are recorded.

Subsequently, the originating network agent 630 transfers the common area of the first and second mobile nodes 620-1 and 620-2 recorded in the second explicit multicast header 760 of the second explicit multicast data packet. The second router 640 transmits the second explicit multicast data packet by the address as tunneling is performed.

In addition, the original network delegate 630 is the external network delegate of the third and fourth mobile nodes (620-3, 620-4) recorded in the second explicit multicast header 760 of the third explicit multicast data packet. As tunneling is performed to transmit the third explicit multicast data packet by the whole address, it is transmitted to the external network agent 650.

The second router 640 may be configured to include first and second mobile nodes, which are recorded in the second explicit multicast header 760 of the second explicit multicast data packet received from the original network agent 630 through tunneling. 620-1, 620-2) to determine the transmission path by the whole school address.

The second router 640 then duplicates the second explicit multicast data packet to generate fourth and fifth explicit multicast data packets to transmit the second explicit data packet along the identified transmission path.

As shown in FIG. 7D, the counterpart node Internet address is recorded in the originator address field 732 of the first Internet packet header 730 of the fourth explicit multicast data packet, and the first explicit multicast header 740 is recorded. ), The first mobile node original network address is recorded.

In addition, the original network delegate address is recorded in the sender address field 752 of the second Internet packet header 750 of the fourth explicit multicast data packet, and the first mobile node is written in the second explicit multicast header 760. Common area school addresses are recorded.

In the fifth explicit multicast data packet, as shown in FIG. 7E, a counterpart node internet address is recorded in the sender address field 732 of the first internet packet header 730, and the first explicit multicast header 740 is recorded. ), The second mobile node original network address is recorded.

In addition, the original network delegate address is recorded in the sender address field 752 of the second Internet packet header 750 of the fifth explicit multicast data packet, and the second mobile node is written in the second explicit multicast header 760. Common area school addresses are recorded.

The second router 640 receives the first mobile node 620-1 by the first mobile node common area whole address recorded in the second explicit multicast header 760 of the generated fourth explicit multicast data packet. Transmit a fourth explicit multicast data packet.

In addition, the second router 640 may use the second mobile node 620-2 by the second mobile node common area whole address recorded in the second explicit multicast header 760 of the fifth explicit multicast data packet. Transmit a fifth explicit multicast data packet.

The first mobile node 620-1 and the second mobile node 620-2 are configured to send a second Internet packet header 750 and a second explicit multicast header in the received fourth and fifth explicit multicast data packets. De-capsulation 760 identifies the explicit multicast data packets sent from the partner node 600.

On the other hand, the external network delegate 650 is the third and fourth mobile node 620 recorded in the second explicit multicast header 760 of the third explicit multicast data packet received from the original network delegate 630. The third and fourth mobile nodes 620-3 and 620-4, which are data transmission paths, are identified at the external network proxy address of the external network agent of -3,620-4.

Subsequently, the external network agent 650 removes the second Internet packet header 750 and the second explicit multicast header 760 from the third explicit multicast data packet, and then determines the third and the third transmission paths that are identified transmission paths. Fourth and seventh explicit multicast data packets are generated by duplicating the third explicit multicast data packet for transmission to the four mobile nodes 620-3 and 620-4.

In the sixth explicit multicast data packet transmitted to the third mobile node 620-3, as shown in FIG. 7F, the sender address field 732 of the first Internet packet header 730 may have a counterpart node Internet address. And the third mobile node original network address is recorded in the first explicit multicast header 740.

In the seventh explicit multicast data packet transmitted to the fourth mobile node 620-4, as shown in FIG. 7G, the sender address field 732 of the first Internet packet header 730 has a counterpart Internet address. And the fourth mobile node original network address is recorded in the first explicit multicast header 740.

An explicit multicast service method on a mobile IP network of Internet version 4 according to the present invention configured and operated as described above will be described with reference to the accompanying drawings.

8 is a flowchart for performing an explicit multicast service on a mobile IP network of Internet version 4 according to a first embodiment of the present invention.

First, the original network delegate 630 receives the first explicit multicast data packet to be transmitted from the counterpart node 600 to the first to fourth mobile nodes 620-1, 620-2, 620-3, and 620-4 (S800). ).

Here, the first explicit multicast data packet includes an internet packet header 700, an explicit multicast header 710, and a data field 720.

The Internet packet header 700 includes a sender address field 702 in which the Internet address of the partner node 600 is recorded, and the explicit multicast header 710 includes the first to fourth mobile nodes 620-1, 620-2, 620. -3,620-4) includes a plurality of fields in which the original network address is recorded.

Subsequently, the originating network agent 630 may be configured with the first to fourth mobile nodes 620-1, 620-2, 620-3, and 620-4 originally recorded in the explicit multicast header 710 of the received first explicit multicast data packet. The whole school addresses of the first to fourth mobile nodes 620-1, 620-2, 620-3, and 620-4 are determined based on the network address (S802).

Here, the whole school addresses of the first to fourth mobile nodes 620-1,620-2,620-3,620-4 include a common area whole school address and an external network delegate whole school address.

The original network delegate 630 determines the next node, which is a transmission path for transmitting the first explicit multicast data packet, based on the whole address of the first to fourth mobile nodes 620-1, 620-2, 620-3, 620-4. (S804).

Here, the next node, which is the determined transmission path, is the second router 640 and the external network agent 650.

Subsequently, the original network delegate 630 includes an explicit multicast including the original network address of a receiver for transmitting to the next node, that is, the first to fourth mobile nodes 620-1, 620-2, 620-3, 620-4. A data packet is generated (S806).

That is, the original network agent 630 replaces the original network addresses of the first and second mobile nodes 620-1 and 620-2 as recipient addresses in order to send the first explicit multicast data packet to the second router 640. Create an explicit multicast data packet that contains.

In addition, the original network agent 630 replaces the original network addresses of the third and fourth mobile nodes 620-3 and 620-4 with recipient addresses in order to send the first explicit multicast data packet to the external network agent 650. Create an explicit multicast data packet that contains.

The original network delegate 630 constructs an explicit multicast header having the whole address of the first to fourth mobile nodes 620-1, 620-2, 620-3, 620-4 as the recipient address, and is generated in step S806. The explicit multicast data packet is encapsulated to generate second and third explicit multicast data packets (S808).

That is, the originating network agent 630 constructs an explicit multicast header having the common area whole address of the first and second mobile nodes 620-1 and 620-2 as the recipient address, and then generates an explicit multicast data packet. Encapsulate to generate a second explicit multicast data packet.

In addition, the original network delegate 630 generates an explicit multicast data packet after constructing an explicit multicast header having external network delegate forwarding addresses of the third and fourth mobile nodes 620-3 and 620-4 as recipient addresses. Encapsulates to generate a third explicit multicast data packet.

Subsequently, the original network delegate 630 transmits the generated second and third explicit multicast data packets to the next through tunneling by the whole address of the first to fourth mobile nodes 620-1,620-2,620-3,620-4. The node transmits to the second router 640 and the external network agent 650 as nodes (S810).

Subsequently, the operation of transmitting the second and third explicit multicast data packets of the second router 640 and the external network agent 650 operates according to the mobile IP and the explicit multicast standard technology, so a detailed description thereof will be omitted. do.

A second embodiment of the present invention will be described with reference to the accompanying drawings.

9 is a schematic structural diagram of an explicit multicast service on a mobile IP network of Internet version 6 according to a second embodiment of the present invention, and FIGS. 10A to 10G are Internet version 6 according to a second embodiment of the present invention. Illustrates the configuration of an explicit multicast data packet on a mobile IP network

In Internet version 6, explicit multicast data packets transmitted in response to performing an explicit multicast service include Internet packet headers with routing extension headers in which the sender address, link-local multicast address, and receiver address are recorded, and a packet in which service data is recorded. Contains the rod.

At this time, the fields in which the caller address and the link local multicast address are recorded have a 128 bit configuration.

Referring to FIG. 9, an explicit multicast service system on a mobile IP network of Internet version 6 according to the present invention includes a correspondent node 900, a first router 910, and first to fourth mobile nodes. Mobile node 920-1, 920-2, 920-3, 920-4, a second router 930, and a third router 940.

The counterpart node 900 is an internet node that performs internet communication with the first to fourth mobile nodes 920-1, 920-2, 920-3, 920-4 through the first router 910.

The original network agent 950 is the first to fourth mobile nodes 920-1,920-2,920-3,920- in the home network to which the first to fourth mobile nodes 920-1,920-2,920-3,920-4 belong. A router that grasps the current access point of 4) and tunnels a data packet for transmission to the first to fourth mobile nodes 920-1,920-2,920-3,920-4.

The second router 930 refers to a router that transmits an explicit multicast data packet received from the original network agent 950 to the first mobile node 920-1 and the second mobile node 920-2.

The third router 940 refers to a router that transmits explicit multicast data packets received from the original network agent 950 to the third and fourth mobile nodes 920-3 and 920-4.

Here, the first to fourth mobile nodes 920-1, 920-2, 920-3, 920-4 are assigned a common area whole address which is an independent address as they move from the original network to another network, and the assigned common area whole address is assigned to the original network. A binding is performed to notify the delegate 950.

An explicit multicast service operation on a mobile IP network of Internet version 6 having such a configuration will be described.

The counterpart node 900 does not recognize that the first to fourth mobile nodes 920-1, 920-2, 920-3, 920-4 have moved from the original network to the external network, and thus the original node of the first to fourth mobile nodes. A first explicit multicast data packet having a network address listed in an explicit multicast header is generated and transmitted to the original network agent 950 through the first router 910.

The first explicit multicast data packet includes an Internet packet header 1000 including a sender address field 1002, a link local multicast address field 1004 and a routing extension header 1020, as shown in FIG. Data field 1010.

In the sender address field 1002, the Internet address of the correspondent node 900 to which an explicit multicast data packet is to be sent to the first to fourth mobile nodes 920-1,920-2,920-3,920-4 is recorded. In the multicast address field 1004, certain addresses assigned to distinguish explicit multicasts are recorded.

At this time, the originator address field 1002 and the link local multicast address field 1004 have a configuration of 128 bits.

The routing extension header 1020 includes a first mobile node original network address field 1022, a second mobile node original network address field 1024, a third mobile node original network address field 1026, and a fourth mobile node original network address. Field 1028.

Here, the first to fourth mobile node original network address fields 1022, 1024, 1026, and 1028 include Internet addresses assigned to the first to fourth mobile nodes 920-1,920-2,920-3,920-4 in the original network. Is recorded.

The original network delegate 950 receives the first explicit multicast data packet as shown in FIG. 10A and receives the first to fourth mobile nodes 920-1, 920-2, 920-3, 920-4 recorded in the routing extension header 1020. The common area address of the first to fourth mobile nodes 920-1, 920-2, 920-3, 920-4 is determined based on the original network address.

Subsequently, the original network delegate 950 transfers the common area of the first to fourth mobile nodes 920-1, 920-2, 920-3, 920-4 recorded in the routing extension header 1020 of the first explicit multicast data packet. The second router 930 and the third router 940 which are transmission paths are identified by the address.

The originating network agent 950 duplicates the first explicit multicast data packet to generate the second and third explicit multicast data packets to send the first explicit multicast data packet to the identified transmission path.

That is, the original network agent 950 records the original network address of the first mobile node 920-1 and the original network address of the second mobile node 920-2 in the first routing extension header. A second explicit multicast data packet is encapsulated with a second Internet packet header including a second routing extension header in which the common area transit address of the mobile node is recorded to generate a second explicit multicast data packet.

As shown in FIG. 10B, the counterpart node Internet address is recorded in the sender address field 1032 of the first Internet packet header 1030 of the second explicit multicast data packet, and the first routing extension header 1040. The first mobile node original network address and the second mobile node original network address are recorded.

In addition, the original network delegate address is recorded in the sender address field 1052 of the second Internet packet header 1050 of the second explicit multicast data packet, and the first routing node 1060 has a first mobile node common area. The whole school address and the second mobile node common area whole school address are recorded.

The originating network agent 950 records the originating network addresses of the third and fourth mobile nodes in the first routing extension header 1040 of the first internet packet header 1030, and sends the third and fourth mobile node common area bridges. A second Internet packet header 1050 having a second routing extension header 1060 having an address recorded is encapsulated in the first explicit multicast data packet to generate a third explicit multicast data packet.

As shown in FIG. 10C, the third explicit multicast data packet is recorded with the partner node Internet address in the sender address field 1032 of the first Internet packet header 1030, and in the first routing extension header 1040. The third mobile node original network address and the fourth mobile node original network address are recorded.

In addition, the third explicit multicast data packet has the original network delegate address recorded in the sender address field 1052 of the second Internet packet header 1050, and the third mobile node common area in the second routing extension header 1060. The whole school address and the fourth mobile node common area whole school address are recorded.

The original network delegate 950 performs tunneling to transmit the generated second explicit multicast data packet to the first and second mobile node common area whole addresses recorded in the second routing extension header 1060.

In addition, the originating network agent 950 performs tunneling to transmit the generated third explicit multicast data packet to the third and fourth mobile node common area whole addresses recorded in the second routing extension header 1060. .

The second router 930 is the first and second mobile node common area whole address recorded in the second routing extension header 1060 of the second explicit multicast data packet received via tunneling from the original network agent 950. The first mobile node 920-1 and the second mobile node 920-2 which are transmission paths of the data are identified.

Subsequently, the second router 930 generates the fourth and fifth explicit multicast data packets by duplicating the second explicit multicast data packets to transmit the second explicit multicast data packets to the identified transmission path. do.

In the fourth explicit multicast data packet transmitted to the first mobile node 920-1, as shown in FIG. 10D, the sender address field 1032 of the first Internet packet header 1030 has a counterpart node Internet address. And the first mobile node original network address is recorded in the first routing extension header 1040.

In addition, the original network delegate address is recorded in the sender address field 1052 of the second Internet packet header 1050 of the fourth explicit multicast data packet, and the second routing extension header 1060 is the first mobile node common area. The school address is recorded.

In the fifth explicit multicast data packet transmitted to the second mobile node, as shown in FIG. 10E, a counterpart node Internet address is recorded in the sender address field 1032 of the first Internet packet header 1030, and The routing extension header 1040 records the second mobile node original network address.

In addition, the original network delegate address is recorded in the sender address field 1052 of the second Internet packet header 1050 of the fifth explicit multicast data packet, and the second routing extension header 1060 is the second mobile node common area. The school address is recorded.

The second router 930 is the first and second mobile node common area recorded in the second routing extension header 1060 of the fourth and fifth explicit multicast data packets as shown in Figs. 10D and 10E. The first and second mobile nodes 920-1 and 920-2 are transmitted by the school address.

The first mobile node 920-1 and the second mobile node 920-2 extract the second Internet packet header 1050 from the fourth and fifth explicit multicast data packets received from the second router 930. As a result, each of the explicit multicast data packets transmitted from the counterpart node 900 is identified.

On the other hand, the third router 940 uses the common area whole address address recorded in the second routing extension header 1060 of the third explicit multicast data packet received from the original network agent 950 through tunneling. Identify the third and fourth mobile nodes that are transmission paths.

The third router 940 generates the sixth and seventh explicit multicast data packets by duplicating the third explicit multicast data packets to transmit the third explicit multicast data packets according to the identified transmission path. .

The sixth explicit multicast data packet transmitted to the third mobile node 920-3 has a counterpart node Internet address in the sender address field 1032 of the first Internet packet header 1030, as shown in FIG. 10F. The third mobile node original network address is recorded in the first routing extension header 1040.

In addition, the original network delegate address is recorded in the sender address field 1052 of the second Internet packet header 1050 of the sixth explicit multicast data packet, and in the second routing extension header 1060, the third mobile node common area. The school address is recorded.

In the seventh explicit multicast data packet transmitted to the fourth mobile node 920-4, as shown in FIG. 10G, the originator address field 1032 of the first Internet packet header 1030 includes a counterpart node Internet address. The fourth mobile node original network address is recorded in the first routing extension header 1040.

In addition, the original network delegate address is recorded in the sender address field 1052 of the second Internet packet header 1050 of the seventh explicit multicast data packet, and the fourth routing extension header 1060 is the fourth mobile node common area. The school address is recorded.

The third router 940 sends the sixth explicit multicast data to the third mobile node 920-3 by the common area whole address recorded in the second routing extension header 1060 of the sixth explicit multicast data packet. Send the packet.

In addition, the third router 940 sends the seventh explicit multiplication to the fourth mobile node 920-4 by the common area whole address recorded in the second routing extension header 1060 of the seventh explicit multicast data packet. Send a cast data packet.

The third mobile node 920-3 specifies that the third mobile node 920-3 is sent from the counterpart node 900 by removing the second Internet packet header 1050 from the sixth explicit multicast data packet received from the third router 940. This will identify the multicast data packet.

In addition, the fourth mobile node 920-4 may be transmitted from the counterpart node 900 by removing the second Internet packet header 1050 from the seventh explicit multicast data packet received from the third router 940. If it does, it will identify the explicit multicast data packet.

11 is a flowchart for performing an explicit multicast service on a mobile IP network of Internet version 6 according to a second embodiment of the present invention.

First, the original network agent 950 receives the first explicit multicast data packet to be transmitted from the counterpart node 900 to the first to fourth mobile nodes 920-1,920-2,920-3,920-4 (S1100). ).

Here, the first explicit multicast data packet includes an internet packet header 1000 and a data field 1010, where the internet packet header 1000 includes a sender address field 1002 in which the Internet address of the partner node 900 is recorded. ), A link local multicast address field 1004, and a first routing extension header 1020 in which the original network addresses of the first to fourth mobile nodes 920-1,920-2,920-3,920-4 are recorded.

Subsequently, the originating network agent 950 may transmit the originating network addresses of the first to fourth mobile nodes 920-1,920-2,920-3,920-4 recorded in the routing extension header 1020 of the received first explicit multicast data packet. In step S1102, the whole school addresses of the first to fourth mobile nodes 920-1,920-2,920-3,920-4 are determined.

Here, the whole school addresses of the first to fourth mobile nodes 920-1,920-2,920-3,920-4 are common area whole school addresses.

The originating network agent 950 selects a next node that is a transmission path for transmitting the first explicit multicast data packet by the common area whole address of the first to fourth mobile nodes 920-1,920-2,920-3,920-4. It determines (S1104).

Here, the next node that is the determined transmission path is the second router 930 and the third router 940.

Subsequently, the originating network agent 950 includes an explicit multicast including the originating network address of the receivers for transmitting to the next node, that is, the first to fourth mobile nodes 920-1,920-2,920-3,920-4. A data packet is generated (S1106).

That is, the original network agent 950 substitutes original network addresses of the first and second mobile nodes 920-1 and 920-2 as recipient addresses in order to transmit the first explicit multicast data packet to the second router 930. Create an explicit multicast data packet that contains.

In addition, the originating network agent 950 substitutes the originating network addresses of the third and fourth mobile nodes 920-3, 920-4 as recipient addresses to send the first explicit multicast data packet to the third router 940. Create an explicit multicast data packet that contains.

The original network agent 950 constructs an Internet packet header including a routing extension header having a common area-wide address of the first to fourth mobile nodes 920-1,920-2,920-3,920-4 as a recipient address, and then the above steps. The explicit multicast data packet generated in S1106 is encapsulated in an Internet packet header to generate second and third explicit multicast data packets (S1108).

That is, the originating network agent 950 constructs an Internet packet header having a routing extension header having the common area transit address of the first and second mobile nodes 920-1 and 920-2 as the recipient address, and then generates an explicit multicast. The data packet is encapsulated by the Internet packet header to generate a second explicit multicast data packet.

In addition, the original network agent 950 constructs an Internet packet header having a routing extension header having external network delegate forwarding addresses of the third and fourth mobile nodes 920-3 and 920-4 as recipient addresses. The cast data packet is encapsulated by the Internet packet header to generate a third explicit multicast data packet.

Subsequently, the original network agent 950 tunnels the generated second and third explicit multicast data packets by the common area whole address of the first to fourth mobile nodes 920-1,920-2,920-3,920-4. The second node 930 and the third router 940 which are the next nodes are transmitted through S1110.

Subsequently, the transmission operation of the second and third explicit multicast data packets by the second router 930 and the third router 940 operates according to the mobile IP and the explicit multicast standard technology, and thus detailed description thereof will be omitted. Shall be.

A third embodiment of the present invention will be described in detail with reference to the accompanying drawings.

12 is a schematic structural diagram of an explicit multicast service apparatus using binding information on an Internet version 6 mobile IP network according to a third embodiment of the present invention, and FIGS. 13A to 13G are according to a third embodiment of the present invention. A diagram illustrating the configuration of explicit multicast data packets using binding information on an Internet version 6 mobile IP network.

Referring to FIG. 12, an explicit multicast service apparatus using binding information on an Internet version 6 mobile IP network according to the present invention includes a counterpart node 1200, a first router 1210, a second router 1220, and a third device. Router 1230 and first to fourth mobile nodes 1240-1, 1240-2, 1240-3, and 1240-4.

The counterpart node 1200 is an internet node that performs internet communication with the first to fourth mobile nodes 1240-1, 1240-2, 1240-3, and 1240-4 through the first router 1210.

As the first to fourth mobile nodes 1240-1,1240-2,1240-3,1240-4 move from the original network to another network, they are assigned a common area whole address, which is an independent address, and the assigned common area whole school. Bind the address to the Internet-connected mode node.

The second router 1220 transmits explicit multicast data packets received from the counterpart node 1200 through the first router 1210 to the first and second mobile nodes 1240-1 and 1240-2, and The third router 1230 transmits explicit multicast data packets received from the counterpart node 1200 through the first router 1210 to the third and fourth mobile nodes 1240-3 and 1240-4.

Here, the counterpart node 1200 connects the original network address of the first to fourth mobile nodes 1240-1, 1240-2, 1240-3, and 1240-4 to the common area whole address, that is, the first to the first. 4 has a binding function for checking the current state of the mobile nodes (1240-1,1240-2,1240-3,1240-4).

An explicit multicast service operation transmitted through an optimized path using binding information of a partner node on an Internet version 6 mobile IP network according to the second embodiment of the present invention configured as described above will be described.

The counterpart node 1200 checks the common local school address assigned by the first to fourth mobile nodes 1240-1,1240-2,1240-3,1240-4 to the external network. As a result, the first explicit multicast data packet as shown in FIG. 13A is generated and transmitted through the first router 1210.

The first explicit multicast data packet includes an Internet packet header 1300 and a data field 1310 in which the sender address, link local multicast address, and receiver address information is recorded, as shown in FIG. 13A.

Here, the Internet packet header 1300 includes a sender address field 1302, a link local multicast address field 1304, and a routing extension header 1320 in which receiver address information is recorded.

In this case, the originator address field 1302 records the Internet address of the partner node 1200, and the link local multicast address field 1304 records a predetermined address for distinguishing explicit multicast.

In addition, the routing extension header 1320 includes first to fourth mobile node common area whole address list fields 1322 and first to fourth mobile node original network address list fields 1324.

Here, the common area whole addresses of the first to fourth mobile nodes 1240-1, 1240-2, 1240-3, and 1240-4 are respectively included in the first to fourth mobile node common area whole school address list fields 1322. In order, the first to fourth mobile node original network address list fields 1324 include original network addresses of the first to fourth mobile nodes 1240-1, 1240-2, 1240-3, and 1240-4. Each is recorded in order.

The first router 1210 may include first to fourth mobile nodes 1240-1, 1240-2, 1240-3, and 1240-4 recorded in the routing extension header 1320 of the first explicit multicast data packet. The second router 1220 and the third router 1230 which are transmission paths are identified by the common area whole address of the router.

Subsequently, the first router 1210 generates the second and third explicit multicast data packets by duplicating the first explicit multicast data packet to transmit the first explicit multicast data packet to the identified transmission path. do.

In the second explicit multicast data packet transmitted to the second router 1220, the partner node Internet address is recorded in the sender address field 1302 of the Internet packet header 1300, as shown in FIG. In the header 1320, a first mobile node common area address, a second mobile node common area address, a first mobile node original network address, and a second mobile node original network address are recorded.

In addition, in the third explicit multicast data packet transmitted to the third router 1230, the partner node Internet address is recorded in the sender address field 1302, and the routing extension header 1320 is recorded in the sender address field 1302 as shown in FIG. The third mobile node common area whole address, the fourth mobile node common area whole address, the third mobile node original network address, and the fourth mobile node original network address are recorded.

The second router 1220 is the first mobile node common area whole address and the second mobile node common area recorded in the routing extension header 1320 of the second explicit multicast data packet received from the first router 1210. Identify the transmission path by the school address.

Subsequently, the second router 1220 duplicates the second explicit multicast data packet to generate fourth and fifth explicit multicast data packets, and the first and second mobile nodes 1220, which are identified transmission paths. 1, 1240-2) to transmit the fourth and fifth explicit multicast data packets.

In the fourth explicit multicast data packet transmitted to the first mobile node 1240-1, the partner node internet address is recorded in the sender address field 1302, and the routing extension header ( In 1320, the first mobile node common area whole school address and the first mobile node original network address are recorded.

In the fifth explicit multicast data packet transmitted to the second mobile node 1240-2, the counterpart node internet address is recorded in the sender address field 1302, and the routing extension header 1320 is shown in FIG. 13E. In the second mobile node common area whole address and the second mobile node original network address are recorded.

Meanwhile, the third router 1230 identifies the transmission path by the third and fourth mobile node common area whole addresses recorded in the routing extension header 1320 of the third explicit multicast data packet.

The third router 1230 then duplicates the third explicit multicast data packet to generate the sixth and seventh explicit multicast data packets, and the third and fourth mobile nodes 1124-0, which are identified transmission paths. 3, 1240-4) transmit the sixth and seventh explicit multicast data packets, respectively.

Here, in the sixth explicit multicast data packet transmitted to the third mobile node 1240-3, as shown in FIG. 13F, the partner node Internet address is recorded in the sender address field 1302, and the routing extension header ( At 1320, the third mobile node common area whole address and the third mobile node original network address are recorded.

In addition, in the seventh explicit multicast data packet transmitted to the fourth mobile node 1240-4, as shown in FIG. 13G, the partner node Internet address is recorded in the sender address field 1302, and the routing extension header ( In 1320, the fourth mobile node common area whole address and the fourth mobile node original network address are recorded.

Explicit multicast service apparatus and method in the mobile IP network according to the present invention, when an explicit multicast data packet is received in the original network of the mobile node, the original network delegate is an explicit multi An explicit multicast data packet is encapsulated by a cast header or a routing extension header and sent to the next node.

Therefore, the present invention provides an effect of providing an explicit multicast service to a mobile node moving from an original network to an external network by means of a forwarding address of a mobile node recorded in an explicit multicast header or a routing extension header. There is.

In addition, the present invention simultaneously records the original network address and the whole address of the mobile node in the routing extension header by using the binding information, thereby eliminating the process of transmitting an explicit multicast data packet to the original network. There is also an effect that can be transmitted.

Although the above has been described with reference to the preferred embodiments of the present invention, those skilled in the art that various modifications of the present invention without departing from the spirit and scope of the present invention described in the claims below And can be changed.

Claims (11)

A method of transmitting an explicit multicast data packet to multiple mobile nodes in a mobile IP network, the mobile node having an original network address in the original network, Receiving a first explicit multicast data packet having an original network address of the plurality of mobile nodes as a recipient address; Determining a whole address of the plurality of mobile nodes corresponding to the original network address; Determining a next transmission path of the first explicit multicast data packet by the whole address; Generating a second explicit multicast data packet having as the recipient address the original network address of the mobile node located on the determined next path; Generating an explicit multicast packet header having the forwarding address of the mobile node on the determined next path as a recipient address; Encapsulating the second explicit multicast data packet by the generated explicit multicast packet header to generate a third explicit multicast data packet; Sending the third explicit multicast data packet to a whole address within the third explicit multicast data packet Explicit multicast service method in a mobile IP network, characterized in that consisting of. The method of claim 1, The third explicit multicast data packet is A first Internet packet header having a first sender address field and a first link local multicast address field, in which the Internet address of the node that transmitted the first explicit multicast data packet is recorded; A first explicit multicast header in which the original network address of the mobile node located on the next transmission path is recorded; A second Internet packet header having a second sender address field and a second link local multicast address field, in which the Internet address of the node transmitting the third explicit multicast data packet is recorded; A second explicit multicast header in which a forward address of the mobile node located on the next transmission path is recorded; And Data field Explicit multicast service method in a mobile IP network, characterized in that consisting of. The method of claim 1, The third explicit multicast data packet is A first sender address field, a first link local multicast address field, in which the Internet address of the node that transmitted the first explicit multicast data packet is recorded, and the original network address of the mobile node located on the next path are recorded. A first internet packet header having a first routing extension header; A second sender address field, a second link local multicast address field, in which an Internet address of a node transmitting the third explicit multicast data packet to a next path is recorded, and a forward address of the mobile node located on the next path; A second Internet packet header having a second routing extension header in which is recorded; And Data field Explicit multicast service method in a mobile IP network, characterized in that consisting of. A method for transmitting an explicit multicast data packet to a plurality of mobile nodes from a counterpart node connected in a mobile IP network, the mobile node having an original network address in the original network, Generating an explicit multicast data packet having as a recipient address a common local area address corresponding to the original network address of the plurality of mobile nodes and the original network address of the plurality of mobile nodes; Sending the explicit multicast data packet to the mobile node according to the common area whole address. Including, The partner node has a binding function, characterized in that the explicit multicast service method in the mobile IP network. The method of claim 4, wherein The explicit multicast data packet is An Internet packet header including a routing extension header having an originating network address field of the plurality of mobile nodes and a common local area address field of the plurality of mobile nodes, a sender address field and a link local multicast address field; Data field An explicit multicast service method in a mobile IP network, characterized in that it comprises a. 10. An apparatus for transmitting an explicit multicast data packet to multiple mobile nodes in a mobile IP network, the mobile node having an original network address in the original network. Means for receiving a first explicit multicast data packet having an original network address of the plurality of mobile nodes as a recipient address; Means for determining a global address of the plurality of mobile nodes corresponding to the original network address; Means for determining a next transmission path of the first explicit multicast data packet by the whole address; Means for generating a second explicit multicast data packet having as a recipient address the original network address of the mobile node located on the determined next path; Means for generating an explicit multicast packet header having the forwarding address of the mobile node on the determined next path as a recipient address; Means for encapsulating the second explicit multicast data packet by the generated explicit multicast packet header to generate a third explicit multicast data packet; Means for sending the third explicit multicast data packet to a global address in the third explicit multicast data packet. An explicit multicast service device in a mobile IP network, characterized in that configured to include. 10. An apparatus for transmitting an explicit multicast data packet to multiple mobile nodes in a mobile IP network, the mobile node having an original network address in the original network. Means for generating an explicit multicast data packet having as a recipient address a common local area address corresponding to the original network address of the plurality of mobile nodes and the original network address of the plurality of mobile nodes; Means for sending the explicit multicast data packet according to the common area whole address Including, An explicit multicast service device in a mobile IP network, wherein the node connected to the mobile IP network has a binding function. 10. An apparatus for transmitting an explicit multicast data packet to multiple mobile nodes in a mobile IP network, the mobile node having an original network address in the original network. A memory in which a program is stored; A processor coupled to the memory to execute the program Including, The processor is an explicit multicast service apparatus in a mobile IP network, characterized in that for executing the explicit multicast service method according to claim 1. 10. An apparatus for transmitting an explicit multicast data packet to multiple mobile nodes in a mobile IP network, the mobile node having an original network address in the original network. A memory in which a program is stored; A processor coupled to the memory to execute the program Including, The processor is an explicit multicast service apparatus in a mobile IP network, characterized by executing the explicit multicast service method according to claim 4. In a data signal including an explicit multicast data packet transmitted to a plurality of mobile nodes in a mobile IP network, The explicit multicast data packet is A first Internet packet header having a first sender address and a first link local multicast address field in which the Internet address of the node that sent the first explicit multicast data packet to the mobile node is recorded, the first explicit multicast A data packet has the original network address of the mobile node as a recipient address; A first explicit multicast header in which the original network address of the mobile node located on a next transmission path of the first explicit multicast data packet is recorded; A second Internet packet header having a second sender address field and a second link local multicast address field in which the Internet address of the node transmitting the explicit multicast data packet is recorded; A second explicit multicast header in which a forward address of the mobile node located on the next transmission path is recorded; And Data field Data signal transmitted by wire or wireless, characterized in that it comprises a. In a data signal including an explicit multicast data packet transmitted from a counterpart node to a plurality of mobile nodes in a mobile IP network, the counterpart node has a binding function; The explicit multicast data packet is An Internet packet header; And Data field Including, The Internet packet header is A sender address field in which the internet address of the counterpart node is recorded; Link local multicast address field; And a routing extension header including a common local area address list field of the plurality of mobile nodes and an original network address list field of the plurality of mobile nodes.