KR100684311B1 - The method for communication between mobile nodes for high speed portable internet - Google Patents

Abstract

The present invention relates to a method for supporting communication between mobile terminals in a high speed portable Internet (HPI) network including a packet access router (PAR) and a home agent (HA).

The high-speed portable internet network accommodates the mobile IP structure to support mobility for mobile terminals, and the access network accommodates foreign agent functions, and multiple FA subnets at gateway points. ) Is the home agent that manages In the present invention, when supporting the end-to-end communication between mobile terminals in this structure, when the mobile terminal belonging to the same subnet moves to another subnet, it supports the end-to-end service while supporting efficient routing through the routing information and ARP information of HA or FA do.

Through this, it is possible to efficiently support end-to-end services between mobile terminals using the same subnet or different subnets in a high-speed portable Internet network.

High speed mobile internet network, external agent, home agent, end-to-end communication support

Description

How to support communication between mobile terminals in high speed mobile internet network {THE METHOD FOR COMMUNICATION BETWEEN MOBILE NODES FOR HIGH SPEED PORTABLE INTERNET}

FIG. 1 is a diagram illustrating a structure of a high speed portable Internet network supporting a mobile IP.

FIG. 2 is a diagram sequentially illustrating an initial process and an FA for supporting end-to-end communication in a high-speed portable Internet network according to an embodiment of the present invention.

3 is a diagram sequentially illustrating an initial registration process for each mobile terminal in FA and HA.

4 is a flowchart sequentially illustrating a packet processing procedure in an HA according to mobile terminal registration.

5 is a flowchart sequentially illustrating a data processing procedure in a previous FA according to a position movement of a mobile terminal.

6 is a flowchart sequentially illustrating an operation process when mobile terminals using the same subnet access the same FA to provide end-to-end service according to an embodiment of the present invention.

7 is a flowchart sequentially illustrating a packet-by-packet routing process according to a location movement for each mobile terminal.

The present invention relates to a high-speed portable internet network, and more particularly, to a method for supporting end-to-end communication in a high-speed portable internet network.

In general, high-speed portable Internet (hereinafter referred to as "HPI") is one of the next generation wireless services for providing an ideal environment for wired and wireless integration, and is currently the most attracting service.

This HPI is differentiated from the wireless Internet of mobile communication in that large data can be used at a high transmission speed, and complements the WLAN in that it can access the Internet while on the move. In addition, it is a great expectation that it can compensate for the shortcomings of existing wireless data services.

Specifically, the HPI network supports a mobile IP service to support mobility for a user terminal that wants to access the Internet.

Mobile IP is an IP layer mobility service that enables continuous use of services without new address allocation even when a user terminal moves to a subnet of another area. The Internet Engineering Task Force (IETF) RFC 3344 This is supported.

For reference, IETF RFC 3344 defines Mobile Node, Foreign Agent and Home Agent to support Mobile IP service, and describes their functions and roles.

A display example of the HPI network supporting the mobile IP service is attached to FIG. 1.

As shown in FIG. 1, the HPI network 100 has packet access of a mobile node 101 (access terminal), a base station 102 (access point), and an external agent (FA) function as a mobile terminal. Authentication and session key distribution are performed for the router (Packet Access Router) 103, the mobile agent 101 for managing binding information for each mobile node 101 (hereinafter, referred to as 'HA', 104), and the mobile node 101. AAA servers (Authentication, Authorization and Accounting, 105).

In this case, as described above, the packet access router 103 may perform only a FA function, and may also perform a mobile agent (MA) function that simultaneously accommodates FA and HA functions. However, when the packet access router 103 accepts the HA function, all datagrams communicating with the mobile node 101 pass through the packet access router 103, thereby putting a load on the packet access router 103. Routing paths lengthen.

However, if the packet access router 103 performs only the FA function, it can not only optimize the routing path in the HPI network 100 during the movement of the mobile nodes 101 to access the Internet, but also reduce the amount of traffic. have.

However, in the above structure, in case of end-to-end communication between mobile nodes using the same subnet, if one mobile node of the mobile nodes connected to the same packet access router moves to another packet access router, the previous packet access router becomes FA. As only the functions are performed, communication between mobile nodes is disrupted because the data cannot be routed to the new packet access router.

Therefore, there is an urgent need for a method in which packet access can efficiently support end-to-end communication between mobile nodes in an HPI network structure in which a router performs only a FA function.

The technical problem to be solved by the present invention is to solve this problem, a mobile terminal using the same subnet in a high-speed portable Internet network including a packet access router and a home agent (HA) of the external agent (FA) function The present invention provides a method for supporting communication between mobile terminals in a high-speed portable Internet network capable of supporting end-to-end services.

In addition, the present invention is a mobile terminal in a high-speed portable Internet network that can support end-to-end service between mobile terminals through routing and ARP information when one mobile terminal of the communication support between the mobile terminals belonging to the same subnet moved to another subnet It is to provide a communication support method.

According to an aspect of the present invention, there is provided a method for supporting communication between mobile terminals in a high speed portable internet network, including: a packet access router (PAR) and a home agent (HA). 1. A method of supporting a method, the method comprising: a) a packet access router and a home agent managing the packet access router performing initialization; b) the packet access router forwarding the mobile IP registration request message received from the mobile terminal to the home agent, and then receiving the mobile IP registration response message from the home agent; c) the packet access router deleting the proxy ARP (Proxy Address Resolution Protocol) for the mobile terminal, and then forwarding the received mobile IP registration response message to the mobile terminal; And d) the home agent establishing a routing path of the mobile terminal or tunneling to a care-of address previously registered by the mobile terminal according to the transferred mobile IP registration request message. do.

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. Like parts are designated by like reference numerals throughout the specification.

FIG. 2 is a diagram sequentially illustrating an initial process and an FA for supporting end-to-end communication in a high-speed portable Internet network according to an embodiment of the present invention.

For reference, the high-speed portable Internet network according to an embodiment of the present invention is a mobile terminal (Access Terminal, hereinafter referred to as a "mobile terminal"), a base station (Access Point), an external agent (FA) Packet Access Router, a home agent that manages binding information for each mobile terminal, and an AAA server that performs authentication and session key distribution for mobile terminals. It includes.

At this time, the packet access router performs only the FA function as mentioned above, and the home agent is located at the gateway point.

First, referring to the initialization process of the FA, as shown in FIG. 2, the FA sets an address and a management subnet (S210), and then configures a routing path for the set management subnet as a default path. (S211).

Thereafter, the FA sets the configured default route to the router above the FA (S212), and then performs ARP (Address Resolution Protocol) for all mobile terminals in the subnet managed by the FA. After setting the proxy ARP so as to be able to do so, it transitions to the state waiting for registration for each mobile terminal.

Next, HA initialization also sets the address and subnet first (S220), and then sets the address of the FA and the subnet of each FA (S221).

Thereafter, the HA sets up an arbitrary virtual interface (S222), which enables the unregistered mobile terminal to prevent the release of packets to the destination.

Thereafter, the HA sets the mobile terminal in the FA area to be routed to the virtual interface, and then sets a default path (S223). After that, the HA also transitions to a state waiting for registration for each mobile terminal.

For reference, if the FA and the HA complete the above initialization process normally, the HA discards the packets transmitted by all mobile terminals in the subnet managed by the HA to the destination.

Next, FIG. 3 is a diagram sequentially illustrating an initial registration process for each mobile terminal in FA and HA.

As shown in FIG. 3, when the mobile terminal (aka mobile node) initially accesses the FA (S310), the mobile terminal receives an Agent advertisement message, which is a mobile IP message, from the FA (S311), and then the FA. In step S312, the mobile IP registration request message is transmitted.

Thereafter, the mobile terminal responds to the registration of the mobile IP (S313), and then sets the FA as a default router (S314).

Next, the FA transmits an agent advertisement message to the mobile terminal (S320) and then receives a mobile IP registration request message from the mobile terminal (S321). Then, the received mobile IP registration request message is delivered to the HA (relay, S322).

Thereafter, the FA receives a mobile IP registration response message from the HA (S323). At this time, after generating the visitor table (S324), the FA adds a host routing path for the home address of the mobile terminal to the generated visitor table (S325). ).

Thereafter, the FA deletes the proxy ARP for the mobile terminal so that the mobile terminal connected to the FA can respond to the ARP (S326). Thereafter, the FA transmits the mobile IP registration response message received from the HA to the mobile terminal (S327).

As such, the registration process for each mobile terminal of the FA is the same as the method defined in the existing standard except for deleting the proxy ARP for the terminal.

Next, when the HA receives the mobile IP registration request message from the FA (S330), the care-of address (hereinafter referred to as 'COA') registered by the mobile terminal is a subnet of the HA management area and moves with the corresponding COA. Check whether the terminal exists in the same network (S331), and if the result of the check exists, the routing path is set up so that the mobile terminal can go to the COA of the FA (S322).

On the other hand, if it is determined as otherwise (320) after establishing a tunnel to the corresponding COA (S333), and updates the binding (binding) (Update, S334) and transmits a response message to the mobile IP registration request to the FA (S335). .

Next, FIG. 4 is a flowchart sequentially illustrating a packet processing procedure in HA according to mobile terminal registration.

First, when the HA receives a packet from the mobile terminal, the destination address of the corresponding packet is routed by the routing table (S410). Such routing is separately routed in FIG. 4.

In detail, the HA first checks whether the destination address of the received packet is a subnet of the HA management area (S411). If the check result is a subnet (S412) of the management area and the mobile terminal that transmitted the packet is a pre-registered mobile terminal, In step S414, the HA routes or tunnels the packet to the FA in step S417.

On the other hand, if the destination address of the packet received as a result of the check is not the subnet managed (S412), HA routes the packet to the default path (S418).

On the other hand, if the destination address is a management subnet but is not a pre-registered mobile terminal, the HA discards the packet by sending the corresponding packet to the virtual interface (S419).

Next, FIG. 5 is a flowchart sequentially illustrating a data processing procedure in a previous FA according to a position movement of a mobile terminal.

As shown in FIG. 5, when the previous FA receives the termination request message for the previous session from the mobile terminal according to the movement of the location of the mobile terminal (S510), the previous FA deletes information on the visited subscriber (S511) and then moves. The host routing information and the ARP information for the home address of the terminal are deleted (S512).

Thereafter, the previous FA checks whether the home address of the mobile terminal is the subnet of the same area as the corresponding FA (S513), and if the home address of the mobile terminal is the same subnet as the result of the check, adds a proxy ARP for the corresponding mobile terminal (S514). On the other hand, if it is not the same subnet, the processing in the previous FA is finished.

Next, FIG. 6 is a flowchart sequentially illustrating an operation process when mobile terminals using the same subnet access the same FA to provide end-to-end service according to an exemplary embodiment of the present invention.

In general, since the Mobile Device 1 based on the Institute of Electrical and Electronics Engineers (IEEE) 802.3 has the same subnet address as the Mobile Device 2, the ARP request is made to the FA to enable the Media Access Control (MAC) address of the Mobile Device 2. I want to know. In this case, the mobile terminals 1 and 2 may communicate with each other (S610).

However, in the high-speed portable Internet system, the communication between mobile terminals is performed not only through a base station but also through a packet access router performing a FA function.

Therefore, when the mobile terminal 1 wants to transmit a packet to the mobile terminal 2 having the same subnet, the mobile terminal 1 transmits the packet to the PAR of the FA function (S611), and the PAR is connected to the corresponding PAR by the mobile terminal 2. The fact is learned through the routing table (S612) and the received packet is forwarded to the mobile terminal 2 (S613).

However, if the mobile terminal 2 is not connected to the PAR as a result of the check, the PAR transmits the received packet to the HA through the default path (S616).

On the other hand, if the mobile terminal 2 wants to transmit a packet to the mobile terminal 1 (S614), the PAR checks the route information of the mobile terminal 1 in the routing table, and if the mobile terminal 1 is connected to the corresponding PAR, received from the mobile terminal 2 The packet is directly transmitted to the mobile terminal 1 (S15).

On the other hand, if the mobile terminal 1 is not connected to the corresponding PAR, the FA routes the packet received from the mobile terminal 2 to the HA according to the default path of the routing table.

Next, FIG. 7 is a flowchart sequentially illustrating a packet-by-packet routing process according to location movement for each mobile terminal.

As shown in FIG. 7, when the mobile terminal 1 is connected to the PAR 1 (S702) and the mobile terminal 2 is connected to the PAR 2 (S701), the PAR and the PAR are connected by the mobile IP registration procedure of the mobile terminals. The HA recognizes the registration state described above (S703).

In this state, when the mobile terminal 1 wants to transmit a packet to the mobile terminal 2 (S704), the PAR 1 to which the mobile terminal 1 is connected is not connected to the PAR 1 based on the destination address of the packet. Detects the packet and transmits the packet to the HA through the default path S705 (S706).

Then, since the HA knows the routing path of the mobile terminal 2 by mobile IP registration, the HA tunnels the packet and transmits the packet to the PAR 2 connected to the mobile terminal 2 (S707).

Thereafter, the PAR 2 forwards the corresponding packet to the mobile terminal 2 using its routing table (S708) (Forwarding. S709).

As such, the method for supporting communication between a packet access router having an external agent function and a mobile terminal in a high speed portable Internet network including a home agent can efficiently support end-to-end services between mobile terminals using the same subnet.

In addition, the present invention efficiently supports end-to-end service between mobile terminals through routing path and ARP coordination without departing from IETF specification.

The drawings and detailed description of the invention are merely exemplary of the invention, which are used for the purpose of illustrating the invention only and are not intended to limit the scope of the invention as defined in the claims or in the claims. Therefore, those skilled in the art will understand that various modifications and equivalent other embodiments are possible from this. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

According to the above configuration, it is possible to efficiently support end-to-end services between mobile terminals using the same subnet in a high speed portable Internet network including a packet access router and a home agent having an external agent function. At this time, the present invention efficiently supports end-to-end service between mobile terminals through routing path and ARP coordination without departing from IETF specification.

In addition, the present invention has an effect that can efficiently support the end-to-end service between the mobile terminal through the routing and APR information, when one mobile terminal of the communication support between the mobile terminal belonging to the same subnet moves to another subnet.

Claims (10)

A method for supporting communication between mobile terminals in a high speed portable Internet network including a packet access router (PAR) and a home agent (HA), a) performing initialization by a packet access router and a home agent managing the packet access router, respectively; b) the packet access router forwarding the mobile IP registration request message received from the mobile terminal to the home agent, and then receiving the mobile IP registration response message from the home agent; c) the packet access router deleting the proxy ARP (Proxy Address Resolution Protocol) for the mobile terminal, and then forwarding the received mobile IP registration response message to the mobile terminal; And d) establishing, by the home agent, a routing path of the mobile terminal according to the transferred mobile IP registration request message or tunneling to a care-of address previously registered by the mobile terminal; Communication support method between mobile terminals in a high-speed portable Internet network comprising a. According to claim 1, Step a) is Establishing, by the packet access router, an address and a management subnet; Configuring a routing path for the set management subnet as a default path; And Setting proxy ARP for the mobile terminal in the set management subnet; Communication support method between mobile terminals in a high-speed portable Internet network comprising a. According to claim 1, Step a) is Setting, by the home agent, a subnet per address and a packet access router, and then setting a virtual interface; And Setting a routing setting and a default route of a mobile terminal belonging to the subnet for each packet access router through the set virtual interface Communication support method between mobile terminals in a high-speed portable Internet network comprising a. The method according to claim 2 or 3, The home agent, Checking whether a destination address of a data packet received from the mobile terminal is included in a subnet of the set management area; Routing or tunneling the received data packet to the packet access router if the mobile terminal is a mobile terminal included in the subnet of the set management area; If it is not included in the subnet of the set management area, routing the received data packet to a default path; And Discarding the received packet through the set virtual interface unless the mobile terminal is included in the subnet of the set management area and is a pre-registered mobile terminal. Communication support method between mobile terminals in a high-speed portable Internet network comprising a. The method according to claim 2 or 3, The packet access router, Receiving a session termination request message from the mobile terminal according to the movement of the location of the mobile terminal; Deleting the host subscriber information and the ARP information for the home address of the mobile terminal after deleting the information on the visited subscriber according to the received message; Checking whether a home address of the mobile terminal is included in a subnet of a new packet access router; And If the new packet access router is included in a subnet of the new packet access router, adding a proxy ARP for the mobile terminal Communication support method between mobile terminals in a high-speed portable Internet network comprising a. The method according to claim 2 or 3, If the mobile terminal is to transmit a packet to a second mobile terminal belonging to the same subnet, confirming whether the second mobile terminal is connected to a packet access router; Forwarding a packet received from the mobile terminal to the second mobile terminal when connected to the packet access router; And If not connected to the packet access router, routing the received packet to a home agent through the established default path Communication support method between mobile terminals in a high-speed portable Internet network comprising a. The method according to claim 2 or 3, When the mobile terminal intends to transmit a packet to a second mobile terminal belonging to another subnet, the packet access router checking the destination address of the packet received from the mobile terminal; Routing the received packet to a home agent through the established default path according to the confirmed destination address; The home agent tunneling the received packet to a new packet access router connected to the second mobile terminal; And The new packet access router forwarding the tunneled packet to the second mobile terminal Communication support method between mobile terminals in a high-speed portable Internet network comprising a. According to claim 1, Step c) is The packet access router generating a visitor table; And Adding a host routing path for the home address of the mobile terminal to the generated visitor table Communication support method between mobile terminals in a high-speed portable Internet network further comprising. According to claim 1, The packet access router is a foreign agent (Foreign Agent) that is a router that manages the subnet to which the mobile terminal is currently connected. The method of claim 9, The home agent manages the external agent and supports communication between mobile terminals in a high speed portable Internet network located at a gateway point.

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