KR100743082B1 - Tunneling device for sending packet to mobile node through mobile router, method of location registration and tunneling thereof - Google Patents

Abstract

A tunneling device of a tunneling protocol for transferring packets to a mobile node through a mobile router, a method of location registration and a tunneling method thereof are provided to reduce a delay time by reducing a tunneling path. A tunneling device of a tunneling protocol for transferring packets to a mobile node through a mobile router includes a mobile router management table generator(100), a mobile router management table storage DB(200), and a tunneling management unit(300). The mobile router management table generator(100) generates and stores binding information between a mobile node and a corresponding mobile router in the mobile router management table. The tunneling management unit(300) receives and de-capsules a first tunneling packet from a home agent of the mobile node, and transmits a second tunneling packet to an address of a corresponding mobile router using the binding information stored in the mobile router management table.

Description

Tunneling device for sending packet to mobile node through mobile router, method of location registration and tunneling knowledge}

1 is a diagram illustrating a conventional mobile IP tunneling protocol.

2 is a diagram illustrating a change flow of packets in a conventional mobile IP tunneling protocol.

3 is a diagram illustrating a mobile IP tunneling protocol according to an embodiment of the present invention.

4 is a diagram illustrating a packet flow in the mobile IP tunneling protocol according to an embodiment of the present invention.

5 is a view showing the internal configuration of a tunneling device of a mobile IP tunneling protocol according to an embodiment of the present invention.

6 is a diagram illustrating a detailed configuration of a mobile router management table generation unit in a tunneling device of a mobile IP tunneling protocol according to an embodiment of the present invention.

7 is a view showing a detailed configuration of the tunneling management unit in the tunneling device of the mobile IP tunneling protocol according to an embodiment of the present invention.

8 is a diagram illustrating a mobile router management table according to an embodiment of the present invention.

9 is a schematic flowchart of a location registration method of a mobile IP tunneling protocol according to an embodiment of the present invention.

10 is a detailed flowchart of a location registration method of a mobile IP tunneling protocol according to an embodiment of the present invention.

11 is a schematic flowchart of a tunneling method of a mobile IP tunneling protocol according to an embodiment of the present invention.

12 is a detailed flowchart of a tunneling method of a mobile IP tunneling protocol according to an embodiment of the present invention.

FIG. 13 is a diagram illustrating a search algorithm of a mobile router management table in a tunneling method of a mobile IP tunneling protocol according to an embodiment of the present invention.

The present invention relates to a tunneling device, a location registration method, and a tunneling method of a tunneling protocol for packet delivery to a mobile node through a mobile router. More specifically, the present invention provides a mobile IP tunneling protocol with reduced transmission delay time and packet overhead in routing to a mobile network environment.

Mobile IP is an IP layer mobility service that enables users to continuously use seamless services without assigning new addresses even when a user terminal moves to a subnet in another area. IETF Internet Engineering Task Force (IETF) RFC ( Request For Comments) supports this in 3344.

For reference, in IETF RFC 3344, a mobile node (hereinafter referred to as 'MN'), an external agent (hereinafter referred to as 'FA'), and a home agent (hereinafter referred to as Home Agent) are used to support mobile IP services. Each is defined as 'HA', and their functions and roles are described.

FIG. 1 is a diagram illustrating a mobile IP tunneling protocol proposed by RFC 3344, and FIG. 2 is a diagram illustrating a packet form changing through each node. In particular, a mobile router (hereinafter, referred to as 'MR') is shown. A tunneling protocol for packet delivery to an MN is shown.

According to FIG. 1, it can be seen that the HA and MR of MR have been added to 'CN → HA → FA → MN1' as compared with the packet forwarding path of the conventional Mobile IPv4 which does not pass through the MR. have.

In this case, tunneling is required between HA and FA of a specific mobile node MN1 in order to send a packet to a desired destination through IP routing in Mobile IPv4 not through MR, but in the tunneling protocol of FIG. 1, HA of MR and HA of MR Tunneling is formed across four nodes, FA and MR. For this purpose, the tunneling protocol of RFC 3344 forms two layers of tunnels.

Then, the process of packet transmission from the counter node (Corresponding Node, hereinafter referred to as 'CN') to the MN1 through the MR using the tunneling protocol proposed by RFC 3344 will be described.

(1) The packet transmitted by the CN is directed to the home network of MN1 by IP routing and arrives first at the HA of MN1.

(2) HA that manages location information of MN1 has registered secondary address of MN1 (hereinafter referred to as 'CoA') as MR's address, so the packet is sent to MR's address (5.5.2.1). Forward after encapsulation.

(3) This packet is delivered to the MR's home network via IP routing and first reaches the HA of the MR.

(4) Again, the HA of the MR confirms that the MR belongs to an external network through table information, and once again encapsulates and forwards this packet to the FA's CoA (3.3.1.1).

In other words, if you look at the packet transmitted from the MR HA to the FA, it can be seen that it has three IP headers. The packet arriving at the FA is decapsulated once by the FA, then transmitted to the MR, and the MR also transmits the original packet sent from the CN to the MN1 through one decapsulation. Therefore, a total of two encapsulations are formed in HA of MN1 and HA of MR.

On the other hand, in the conventional Mobile IPv4 that does not pass through the MR it can be seen that the address selected by MN1 as CoA is changed from the address of the FA to the address of the MR that exists directly at its own level.

If the MN1 does not want to use MR service and communicates directly within the service area of the external network, select the FA address as CoA and receive the service directly from the FA. However, when a node belongs to a mobile network, it is MR, not MN1, that selects FA's address as CoA. Therefore, even if the MN1 no longer finds an agent or registers himself with the location, the MN1 can be guaranteed its mobility by being added to the MR network.

However, according to the tunneling protocol for packet transmission to the MN through the MR, the packet to be transmitted to the MN must pass not only the HA of the MN but also the HA of the MR, thereby increasing the transmission delay and overlapping the IP header. There is a disadvantage that the packet overhead is increased.

In other words, the unnecessary path is added, which is not efficient in delay time, and the additional IP header is added to add two extra headers.

Accordingly, an aspect of the present invention is to provide a tunneling protocol, a location registration method, and a tunneling method of a tunneling protocol for packet delivery to a mobile node through a mobile router, which improves a problem caused by an increase in delay time and overhead. will be.

Tunneling apparatus according to a feature of the present invention in order to achieve the above problems,

A tunneling device of a mobile IP tunneling protocol for transmitting a packet received from a partner node to a plurality of mobile nodes through a mobile router, comprising: a mobile node having a location registered with an address of an external agent as a care of address (CoA); A mobile router management table generation unit generating binding information between the mobile routers and storing the binding information in the mobile router management table; And receiving and decapsulating a first tunneling packet encapsulating the address of the foreign agent as a destination from a home agent of the mobile node, and then using the binding information stored in the mobile router management table. And a tunneling management unit configured to transmit a second tunneling packet encapsulated as an address.

Location registration method according to a feature of the invention,

A location registration method of a mobile IP tunneling protocol for transmitting a packet received from a counterpart node to a plurality of mobile nodes through a mobile router, the method comprising: (a) receiving, by an external agent, a location registration message of a mobile node from a mobile router; ; (b) generating binding information between the mobile node and the mobile router, storing the binding information in a mobile router management table; And (c) forwarding the location registration message to a home agent of the corresponding mobile node.

Tunneling method according to a feature of the invention,

A tunneling method of a mobile IP tunneling protocol for transmitting a packet received from a counterpart node to a plurality of mobile nodes through a mobile router, the method comprising: (a) obtaining an address of an external agent to which the mobile node is connected from a home agent of the mobile node; Receiving a first tunneling packet encapsulated to a destination; (b) obtaining an address of a corresponding mobile router of the mobile node from a mobile router management table including binding information between the mobile node and the mobile router on the basis of the analysis of the packet decapsulating the first tunneling packet; And (c) transmitting the second tunneling packet encapsulated to the obtained address of the corresponding mobile router.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like parts throughout the specification.

In addition, when a part is said to "include" a certain component, this means that it may further include other components, except to exclude other components unless otherwise stated.

In addition, the term module described herein refers to a unit for processing a specific function or operation, which may be implemented in hardware or software, or a combination of hardware and software.

Now, a tunneling apparatus, a location registration method, and a tunneling method of a tunneling protocol for packet delivery to a mobile node through a mobile router according to an embodiment of the present invention will be described in detail with reference to the drawings.

3 is a diagram illustrating a mobile IP tunneling protocol according to an embodiment of the present invention, and FIG. 4 is a diagram showing a packet flow in the mobile IP tunneling protocol according to an embodiment of the present invention.

According to FIG. 3, in the mobile IP tunneling protocol through the mobile router, the external agent FA includes a mobile router management table P101 including binding information between the mobile router MR and the corresponding mobile nodes MN. The FA decapsulates the received first tunneling packet and if the original destination of the packet is an MN stored in the mobile router management table (P101), the FA searches for the address of the corresponding MR and transmits the second tunneling packet encapsulated to the destination to the MR. do.

Next, a process of transmitting a packet from the counterpart node CN to the MN1 through the MR will be described with reference to FIG. 4.

(1) The CN transmits a packet destined for MN1.

(2) The HA of the MN1 receiving the packet transmitted by the CN transmits a first tunneling packet that encapsulates the packet received by the CoA of the MN1.

(3) After receiving the first tunneling packet, the FA decapsulates it, and if the original destination is a node belonging to the mobile network, the FA searches the mobile router management table to obtain an address of the corresponding MR. The second tunneling packet encapsulated is transmitted to the corresponding MR address.

(4) After receiving the second tunneling packet, the MR decapsulates it and transmits it to MN1.

(5) MN1 receives the original packet sent by the CN.

As such, according to the mobile IP tunneling protocol according to an embodiment of the present invention, the delay time and the IP header of the tunneling packet can be reduced due to the reduction of the tunneling path.

Then, a tunneling device for implementing the mobile IP tunneling protocol according to an embodiment of the present invention will be described based on the above description.

5 is a diagram illustrating an internal configuration of a tunneling device of a mobile IP tunneling protocol according to an embodiment of the present invention, and FIG. 6 is a detailed diagram of a mobile router management table generation unit in a tunneling device of a mobile IP tunneling protocol according to an embodiment of the present invention. FIG. 7 is a diagram illustrating a detailed configuration of a tunneling management unit in a tunneling device of a mobile IP tunneling protocol according to an embodiment of the present invention, and FIG. 8 is a diagram illustrating a mobile router management table according to an embodiment of the present invention. Figure is shown.

According to FIG. 5, the tunneling device 1 includes a mobile router management table generator 100, a mobile router management table storage DB 200, and a tunneling manager 300.

The mobile router management table generation unit 100 generates binding information between the mobile node where the external agent registers its address as a CoA and the corresponding mobile router, and stores the binding information in the mobile router management table.

The mobile router management table storage DB 200 stores the mobile router management table generated by the mobile router management table generator 100.

The tunneling management unit 300 receives and decapsulates the first tunneling packet, which encapsulates the address of the foreign agent as a destination, from the home agent of the mobile node, and then decodes the address of the corresponding mobile router obtained from the mobile router management table. The encapsulated second tunneling packet is transmitted.

According to FIG. 6, the mobile router management table generation unit 100 includes a reception module 120, a table configuration module 140, a transmission module 160, and a table update module 180.

The receiving module 120 receives a location registration message of the corresponding mobile node for the external agent to register its address as a secondary address from the mobile router.

The table configuration module 140 configures the mobile router management table based on the location registration message received by the reception module 120 and stores the mobile router management table in the mobile router management table storage DB 200. In this case, as shown in FIG. 8, the mobile router management table includes binding information in which an address P203 of the mobile router and an address P201 of mobile nodes managed by the mobile router match.

The transmitting module 160 transmits the location registration message received by the receiving module 120 to the home agent of the corresponding mobile node.

The table update module 180 updates the mobile router management table based on a cycle of life time of the mobile node and the corresponding mobile router. This may be configured to include the received signal checker 182 and the table updater 184 in more detail.

The received signal checker 182 checks whether a received signal is received from the mobile node and the corresponding mobile router on the basis of the life time period.

The table updater 184 interoperates with the reception signal checker 182 to update or discard the binding information of the corresponding mobile node and the mobile router in the mobile router management table according to the received signal.

According to FIG. 7, the tunneling manager 300 includes a first tunneling packet reception module 320, a search module 340, and a second tunneling packet transmission module 340.

The first tunneling packet receiving module 320 receives the first tunneling packet encapsulated from the mobile agent's home agent to the auxiliary address of the mobile node.

The search module 340 searches the mobile router management table based on the information obtained by analyzing the packet decapsulated by the first tunneling packet receiving module 320. This may be configured in more detail to include decapsulation processor 342, checker 344, and searcher 346.

The decapsulation processor 342 performs decapsulation according to whether the packet received from the home agent of the mobile node is the first tunneling packet.

The checker 344 analyzes the packet decapsulated by the first tunneling packet to check whether the original destination is a mobile node.

The searcher 346 searches for the mobile node and the mobile router by searching the mobile router management table when the original destination is the mobile node as a check result of the checker.

The second tunneling packet transmission module 340 transmits the second tunneling packet encapsulated to the address of the corresponding mobile router obtained through the search of the search module 340.

Now, the location registration method and the tunneling method of the mobile IP tunneling protocol will be described based on the above-described configuration.

9 is a schematic flowchart of a location registration method of a mobile IP tunneling protocol according to an embodiment of the present invention, and FIG. 10 is a detailed flowchart of a location registration method of a mobile IP tunneling protocol according to an embodiment of the present invention.

According to FIG. 9, the location registration method includes a location registration message receiving step S101, a mobile router management table generation step S103, and a location registration message delivery step S105.

In step S101, an external agent receives a location registration message of a corresponding mobile node from a mobile router.

The mobile router management table generation step (S103) generates binding information between the mobile node and the mobile router, configures the mobile router management table, and stores the binding information.

The location registration message delivery step S105 transfers the location registration message received in the location registration message reception step S101 to the home agent of the mobile node.

According to FIG. 10, the detailed location registration method receives a location registration message for registering an address of an external agent as an auxiliary address (CoA) of a mobile node (S201).

The mobile router management table is configured by generating information binding the addresses of the mobile node and the mobile router based on the received location registration message (S203).

The location registration message received in step S201 is transmitted to the home agent of the mobile node (S205).

Thereafter, the mobile router management table configured in step S203 is updated, and the mobile router management table is updated in units of a life time period of the mobile router and the corresponding mobile node.

That is, it is checked whether or not a signal is received from the mobile router and the mobile node on the basis of the life time period of the mobile router and the mobile node (S207).

As a result of the received signal check (S207), the mobile router for which the received signal has not been reached and binding information of the corresponding mobile node are discarded from the mobile router management table (S209).

As a result of the received signal check (S207), the mobile router having received the received signal and binding information of the corresponding mobile node are updated in the mobile router management table (S211).

11 is a schematic flowchart of a tunneling method of a mobile IP tunneling protocol according to an embodiment of the present invention, FIG. 12 is a detailed flowchart of a tunneling method of a mobile IP tunneling protocol according to an embodiment of the present invention, and FIG. In the tunneling method of the mobile IP tunneling protocol according to an embodiment of the present invention, a search algorithm of a mobile router management table is shown.

According to FIG. 11, the tunneling method includes a first tunneling packet reception step S301, a mobile router management table search step S303, and a second tunneling packet transmission step S303.

Receiving the first tunneling packet (S301) receives a first tunneling packet that encapsulates the address of the foreign agent to which the mobile node is connected as a destination from the home agent of the mobile node.

In the mobile router management table search step (S303), the mobile router management table including the binding information between the mobile node and the mobile router is searched based on the information obtained by analyzing the packet decapsulating the first tunneling packet. Acquire.

The second tunneling packet transmission step (S303) transmits the second tunneling packet encapsulated to the address of the corresponding mobile router obtained in the mobile router management table lookup step (S303).

According to FIG. 12, a detailed tunneling method includes a first tunneling packet obtained by encapsulating a packet transmitted by a counterpart node from a home agent of a specific mobile node in which a mobile node has registered an address of an external agent connected as a CoA to an address of an external agent. Receive (S401).

At this time, it is checked whether the packet received from the home agent of the mobile node is the first tunneling packet in step S401, and decapsulates the first tunneling packet according to the checked result (S403).

The packet decapsulated in step S403 is analyzed to determine whether the original destination is a node belonging to the mobile network (S405).

As a result of checking in step S405, if the original destination is a node belonging to the mobile network, the mobile router management table is searched to obtain an address of the corresponding mobile router of the mobile node (S407). In this case, the searching process of the mobile router management table may be performed through an algorithm as shown in FIG. 13, but is not limited thereto. For reference, in FIG. 13, MRMT (P301) is an abbreviation of Mobile Router Management Table and refers to a mobile router management table.

The second tunneling packet, which encapsulates the destination with the address of the corresponding mobile router obtained in step S407, is transmitted to the corresponding mobile router (S409).

The embodiments of the present invention described above are not implemented only through the apparatus and the method, but may be implemented through a program for realizing a function corresponding to the configuration of the embodiment of the present invention or a recording medium on which the program is recorded. Implementation may be easily implemented by those skilled in the art from the description of the above-described embodiments.

The scope of the present invention is not limited to the above-described embodiments, but various modifications and improvements of those skilled in the art using the basic concept of the present invention as defined in the following claims are also within the scope of the present invention.

As described above, according to an embodiment of the present invention, conventional tunneling is performed by using an external agent address as an auxiliary address of a mobile node and constructing binding information based on the mobile router address and the mobile node address to use in tunneling. Compared to the protocol, the tunneling path can be reduced to reduce latency and reduce IP header overlap in packet overhead.

Claims (14)

In the tunneling device of the mobile IP tunneling protocol for transmitting a packet received from the correspondent node (Corresponding Node, CN) to a plurality of mobile nodes (MN) through a mobile router (MR), A mobile router management table generation unit generating binding information between a mobile node having a location registered as an address of a foreign agent as a care of address (CoA) and a corresponding mobile router and storing the binding information in a mobile router management table; And Receives and decapsulates a first tunneling packet that encapsulates the address of the foreign agent as a destination from a home agent (HA) of the mobile node, and obtains the binding information stored in the mobile router management table. Tunneling management unit for transmitting the second tunneling packet encapsulated the address of the mobile router to the destination Tunneling device comprising a. The method of claim 1, The mobile router management table generation unit, A receiving module for receiving a location registration message of a corresponding mobile node for the foreign agent to register its address as a secondary address from a mobile router; A table configuration module for configuring the mobile router management table based on the location registration message; And A sending module for transmitting the location registration message to a home agent of the corresponding mobile node Tunneling device comprising a. The method of claim 2, The mobile router management table generation unit, A table updating module for updating the mobile router management table based on a period of a life time of the mobile node and the corresponding mobile router Tunneling apparatus further comprises a. The method of claim 3, The table update module, A reception signal checker which checks whether a reception signal is received from the mobile node and the corresponding mobile router based on the period of the life time; And A table updater that updates or discards binding information of a corresponding mobile node and a mobile router to the mobile router management table in association with the received signal checker; Tunneling device comprising a. The method according to any one of claims 1 to 4, The mobile router management table, And the address of the mobile router and the address of the mobile nodes managed by the mobile router are configured with matching binding information. The method of claim 5, The tunneling management unit, A first tunneling packet receiving module for receiving a first tunneling packet encapsulated from the mobile node's home agent to an auxiliary address of the mobile node; A search module for searching the mobile router management table based on the analyzed information of the decapsulated packet of the first tunneling packet; And A second tunneling packet transmission module for transmitting the second tunneling packet encapsulated to the address of the corresponding mobile router obtained through the search of the search module; Tunneling device comprising a. The method of claim 6, The search module, A decapsulation processor for performing decapsulation according to whether the packet received from the home agent of the mobile node is the first tunneling packet; A checker for analyzing a packet decapsulated by the first tunneling packet and checking whether the original destination is a mobile node; And A searcher for searching for the mobile node and the mobile router by searching the mobile router management table when the original destination is a mobile node as a result of the check of the checker Tunneling device comprising a. A location registration method of a mobile IP tunneling protocol for transmitting a packet received from a counterpart node to a plurality of mobile nodes through a mobile router, (a) the foreign agent receiving a location registration message of the mobile node from the mobile router; (b) generating binding information between the mobile node and the mobile router, storing the binding information in a mobile router management table; And (c) forwarding the location registration message to a home agent of the corresponding mobile node; Location registration method comprising a. The method of claim 8, After the step (c), (d) updating the mobile router management table based on a period of life time of the mobile router and the corresponding mobile node; Location registration method further comprising. The method of claim 9, In step (d), (I) checking whether a signal is received from the mobile router and the corresponding mobile node based on the period of the life time; (Ii) discarding in the mobile router management table the binding information of the mobile router and the mobile node for which the received signal has not been reached in step (iii); And (Iii) updating the binding information of the mobile router and the corresponding mobile node to which the received signal has been reached in step (iii); Location registration method comprising a. The method according to any one of claims 8 to 10, In step (b), And matching each address of the corresponding mobile nodes managed by the mobile router to an address of the mobile router to configure the mobile router management table. The method of claim 11, In step (a), And receiving the location registration message for registering the address of the foreign agent as a CoA of the mobile node. In the tunneling method of the mobile IP tunneling protocol for transmitting a packet received from a partner node to a plurality of mobile nodes through a mobile router, (a) receiving a first tunneling packet that encapsulates a packet transmitted by the counterpart node from an home agent of the mobile node to an address of an external agent to which the mobile node is connected; (b) obtaining an address of a corresponding mobile router of the mobile node from a mobile router management table that contains binding information between the mobile node and the mobile router based on the analyzed information of the decapsulated packet of the first tunneling packet; And (c) transmitting the second tunneling packet encapsulated to the obtained address of the mobile router; Tunneling method comprising a. The method of claim 13, In step (b), (Iii) decapsulating the first tunneling packet as determined whether the packet received from the home agent of the mobile node is the first tunneling packet; And (Ii) analyzing the decapsulated packet of the first tunneling packet to check whether the original destination is a node belonging to this network; And (Iii) searching the mobile router management table to obtain an address of the mobile node of the mobile node when the original destination is a node belonging to the mobile network as a result of checking in step (ii). Tunneling method comprising a.

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