KR100798148B1 - Tunneling device for sending packet to mobile node through mobile router, method of location registration and tunneling thereof - Google Patents

Abstract

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.

According to the present invention, a tunneling device of a mobile IP tunneling protocol for transmitting a packet received from a corresponding node (Corresponding Node, CN) to a plurality of mobile nodes (MN) through a mobile router (MR) A location registration manager and a tunneling manager.

The location registration manager performs location registration of the mobile node by matching respective care-of address (CoA) of the mobile node and the corresponding mobile router.

The tunneling manager encapsulates the packet destined for the mobile node received from the counterpart node as the auxiliary address of the corresponding mobile node and the auxiliary address of the mobile router, and then forwards the tunneling packet thus formed.

By using such a tunneling device, the home agent of the mobile node can perform the function of the home agent of the mobile router, so that the home agent of the mobile router can be excluded from the tunneling path to reduce the delay time.

Mobile IP Tunneling Protocol, Mobile Router, Mobile Node

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 view showing the 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.

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

8 is a flowchart illustrating 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 when 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.

Next, a process of transmitting a packet from the counterpart 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 the service through the MR and communicates directly in the service area of the external network, the MN1 selects the FA address as a CoA and receives 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 as described above, since the packet to be transmitted to the MN must pass not only the HA of the MN but also the HA of the MR, a transmission delay increases.

In other words, unnecessary paths are added, which makes it inefficient in latency.

Accordingly, the present invention provides 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 reduces a tunneling path and improves a problem caused by an increase in delay time. To provide.

Tunneling apparatus according to a feature of the present invention in order to achieve the problem as described above,
A tunneling device of a mobile IP tunneling protocol for delivering a packet to a mobile node through a mobile router, comprising: a location registration storing a location registration management table containing auxiliary address matching information of each of the mobile node and the corresponding mobile router of the mobile node Management DB; A location registration management module configured to configure the location registration management table based on the auxiliary address mapping information generated by performing location registration of the mobile node and the corresponding mobile router according to the location registration request of the mobile node; And a tunneling management unit for forwarding the tunneling packet generated by encapsulating the packet destined for the mobile node received from the mobile station to the auxiliary address of the mobile node and the auxiliary address of the mobile router obtained through the location registration management table. do.

delete

Location registration method according to a feature of the invention,

A method of registering a location 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, the method comprising: (a) receiving a location registration message of the mobile node from a corresponding mobile router of the mobile node; Submission step; (b) performing location registration of each of the mobile node and the corresponding mobile router according to the location registration message; And (c) matching auxiliary addresses of the mobile node and the corresponding mobile router according to the location registration of step (b).

Tunneling method according to a feature of the invention,
CLAIMS 1. A method in which a home agent device of a mobile node tunnels in a mobile IP tunneling protocol for delivering a packet to a mobile node through a mobile router, the method comprising the steps of: (a) receiving a packet destined for the mobile node from a counterpart node; (b) a location registration management table generated through location registration of the mobile node and the corresponding mobile router of the mobile node, wherein the location registration management table includes mapping information of the auxiliary address of the mobile node and the auxiliary address of the corresponding mobile router; Retrieving stored-to obtain a secondary address of each of the mobile node and the corresponding mobile router; (c) encapsulating the packet received in step (a) with an auxiliary address of the mobile node obtained; (d) encapsulating the packet encapsulated in step (c) to an auxiliary address of the mobile router; And (e) forwarding the tunneling packet generated by encapsulation in step (d) to a corresponding destination.

delete

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.

FIG. 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 home agent HA of the mobile node MN registers the location of the MN as well as the location of the MN when registering the location information of the MN. The location registration management table P101 in which not only CoA but also MR auxiliary address CoA is stored is managed.

Subsequently, when the HA of the MN receives a packet destined for the MR of the MN, the HA of the MN performs two encapsulations to the MR's secondary address and the MN's secondary address, and then forwards the tunneling packet formed by the encapsulation to the corresponding destination.

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 MN1 receives the packet transmitted by CN and performs two encapsulations, respectively, with CoA (5.5.2.1) of MN1 and CoA (3.3.1.1) of MR.

(3) The FA receiving the packet encapsulated by the HA of MN1 decapsulates it.

(4) MR decapsulates the packet de-encapsulated by FA, and then forwards to MN1.

(5) MN1 receives original packets decapsulated by MR, that is, sent by CN.

As such, the HA of the MN may perform the function of the HA of the MR, thereby reducing the delay time since the HA of the MR is excluded from 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 view showing the internal configuration of the tunneling device of the mobile IP tunneling protocol according to an embodiment of the present invention, Figure 6 is 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 The figure shown.

According to FIG. 5, the tunneling device 1 includes a location registration manager 100 and a tunneling manager 200.

The location registration management unit 100 registers a location of the mobile node by matching an auxiliary address (CoA) of each of the mobile node and the corresponding mobile router. In more detail, the location registration management table storage DB 120 and the location registration management module 140 may be configured.

The location registration management table storage DB 120 stores a location registration management table that contains matching information between the auxiliary address of the mobile node and the auxiliary address of the corresponding mobile router.

The location registration management module 140 configures the location registration management table according to the location registration message of the mobile node and the mobile router performed according to the location registration message of the mobile node received from the mobile router, and stores the location registration management table DB 120 ). At this time, the location registration message received from the mobile router requests the location registration of the address of the mobile router as a secondary address of the mobile node, and requests the location registration of the address of the external agent to which the mobile node is connected as the secondary address of the mobile router. .

The tunneling manager 200 encapsulates the packet destined for the mobile node received from the counterpart node as the auxiliary address of the mobile node and the auxiliary address of the mobile router, respectively, and forwards the tunneling packet generated accordingly.

According to FIG. 6, the tunneling manager 200 includes a receiving module 220, a tunneling module 240, and a transmitting module 260.

The receiving module 220 receives a packet destined for a node belonging to a mobile network from a counterpart node.

The tunneling module 240 generates a tunneling packet that encapsulates the packet received by the receiving module 220 to the secondary address of the mobile node and the corresponding mobile router. This may be configured to include a searcher 242, a first tunneling processor 244, and a second tunneling processor 246 in more detail.

The searcher 242 searches the location registration management table of the mobile node and obtains an auxiliary address of each of the mobile node and the corresponding mobile router.

The first tunneling processor 244 encapsulates the packet received by the receiving module 220 to the secondary address of the mobile node.

The second tunneling processor 246 encapsulates the packet encapsulated by the first tunneling processor 224 to the secondary address of the corresponding mobile router.

The transmission module 260 forwards the tunneling packet generated by the tunneling module 240 to the corresponding destination.

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

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

According to FIG. 7, the location registration method receives the location registration message of the mobile node from the corresponding mobile router of the mobile node (S101). In this case, the location registration message may be a location registration request of the address of the mobile router as an auxiliary address of the mobile node, and a location registration request of the address of an external agent to which the mobile node is connected as an auxiliary address of the mobile router.

Next, location registration of each mobile node and the corresponding mobile router is performed according to the location registration message received in step S101 (S103).

According to the location registration performed in step S103, the location registration management table is configured by matching the auxiliary addresses of the mobile node and the corresponding mobile router (S105).

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

According to FIG. 8, a packet destined for the mobile node is received from the partner node (S201).

Next, the received packet is encapsulated with the secondary address of the mobile node and the corresponding mobile router. First, the secondary node of the mobile node and the corresponding mobile router is matched to the stored location registration management table. Acquire the secondary address (S203).

The packet received in step S201 is encapsulated with a supplemental address of the mobile node obtained in step S203 (S205).

Next, the packet encapsulated in the step S205 is encapsulated to the secondary address of the mobile router obtained in the step S203 (S207).

The tunneling packet generated by the encapsulation in the step S207 is forwarded to the corresponding destination (S209).

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 the embodiment of the present invention, the packet from the counterpart node is transferred from the mobile agent's home agent to the external agent without passing through the home agent of the mobile router, thereby ensuring a shorter delay time than the existing tunneling protocol. .

Claims (10)

delete A tunneling device of a mobile IP tunneling protocol for delivering a packet to a mobile node through a mobile router, A location registration management DB for storing a location registration management table containing auxiliary address matching information of each of the mobile node and the corresponding mobile router of the mobile node; A location registration management module configured to configure the location registration management table based on the auxiliary address mapping information generated by performing location registration of the mobile node and the corresponding mobile router according to the location registration request of the mobile node; Tunneling management unit for forwarding the tunneling packet generated by encapsulating the packet destined for the mobile node received from the other node to the secondary address of the mobile node and the secondary address of the mobile router obtained through the location registration management table, respectively. Tunneling device comprising a. The method of claim 2, The location registration management module, The location requesting the location registration request of the address of the mobile router as the auxiliary address of the mobile node, and the location registration request of the address of the foreign agent (FA) to which the mobile node is connected as the auxiliary address of the mobile router. Tunneling device, characterized in that receiving a registration message. The method according to claim 2 or 3, The tunneling management unit, A receiving module for receiving a packet destined for the mobile node from the counterpart node; A tunneling module for generating a tunneling packet that encapsulates the received packet into an auxiliary address of the mobile node and the corresponding mobile router; And A transmission module for forwarding the tunneling packet generated by the tunneling module to a corresponding destination Tunneling apparatus comprising a. The method of claim 4, wherein The tunneling module, A searcher for searching the location registration management table of the mobile node to obtain an auxiliary address of each of the mobile node and the corresponding mobile router; A first tunneling processor that encapsulates the packet received by the receiving module to a secondary address of the mobile node; And A second tunneling processor for encapsulating the packet encapsulated by the first tunneling processor to an auxiliary address of the corresponding mobile router 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) receiving a location registration message of the mobile node from the corresponding mobile router of the mobile node; (b) performing location registration of each of the mobile node and the corresponding mobile router according to the location registration message; And (c) matching the secondary addresses of the mobile node and the corresponding mobile router according to the location registration of step (b) Location registration method comprising a. The method of claim 6, Step (c) is, And a location registration management table that contains matching information between the auxiliary address of the mobile node and the auxiliary address of the corresponding mobile router. The method according to claim 6 or 7, In step (a), The location requesting the location registration request of the address of the mobile router as the auxiliary address of the mobile node, and the location registration request of the address of the foreign agent (FA) to which the mobile node is connected as the auxiliary address of the mobile router. And a registration message. delete A method for tunneling a home agent device of a mobile node in a mobile IP tunneling protocol for delivering a packet to a mobile node through a mobile router, (a) receiving a packet destined for the mobile node from a counterpart node; (b) a location registration management table generated through location registration of the mobile node and the corresponding mobile router of the mobile node, wherein the location registration management table includes mapping information of the auxiliary address of the mobile node and the auxiliary address of the corresponding mobile router; Retrieving stored-to obtain a secondary address of each of the mobile node and the corresponding mobile router; (c) encapsulating the packet received in step (a) with an auxiliary address of the mobile node obtained; (d) encapsulating the packet encapsulated in step (c) to an auxiliary address of the mobile router; And (e) forwarding the tunneling packet generated by encapsulation in step (d) to a corresponding destination; Tunneling method comprising a.

Images