KR101118266B1 - Method for context exchange between access gateway in network based mobility technology - Google Patents

Abstract

Disclosed is a method of exchanging information between access gateways to support network-based mobility.

When the mobile terminal moves from the first access network to the second access network, the second access gateway of the second access network receives a router request message in a method for exchanging information between access gateways in a system for supporting network-based mobility. The mobile station detects the entry into the corresponding area and transmits the profile request message of the mobile terminal to the first access gateway of the neighboring first access network. Then, the first access gateway responds by transmitting a profile response message including at least one of a user profile, QoS profile, service profile, and authentication profile of the mobile terminal according to the profile request message of the mobile terminal. When the second access gateway receives the profile response message, the second access gateway updates the proxy binding information to generate a bidirectional tunnel between LMAs and performs a router response corresponding to the router request message.

Access gateway, LMA, profile, mobility

Description

Information exchange between access gateways to support network-based mobility {METHOD FOR CONTEXT EXCHANGE BETWEEN ACCESS GATEWAY IN NETWORK BASED MOBILITY TECHNOLOGY}

The present invention relates to a method of exchanging information between access gateways for supporting network-based mobility. In particular, the present invention relates to a method for reducing handover time according to exchange of information between mobile access gateways in a network-based mobility technology.

Mobile communication systems based on IEEE802.16e, such as the Mobile World Interoperability for Microwave Access (Mobile WiMAX) system, provide seamless Internet services to mobile users. Such a mobile communication system is based on a network-based mobile communication structure, and supports a handover to continuously maintain a service without interruption even when a terminal in service enters another cell area due to a location movement. .

Meanwhile, as a technology for providing network-based mobility, the Proxy Mobile IP (PMIP) protocol may be used.

PMIP technology is a mobile access gateway to replace the local mobile anchor (LMA) and mobile node (MN) functions that localize the home agent (HA) function of the mobile IP protocol in the network. It is a technology to manage mobility between Access Gateway and MAG. Therefore, the mobile terminal MN need not be equipped with a technology for supporting specific mobility.

However, in such a network-based mobility support method, when a handover of the mobile terminal occurs, the mobile terminal MN may access the corresponding terminal by using a lower layer (eg, Layer 2) or by using another technology. It is necessary to recognize that the terminal has moved to another access, and update the current location of the mobile terminal to the LMA. At this time, the user's profile, quality of service (QoS) profile, and AAA (Authentication, Authorization, Accounting) status should be newly received.

In addition, when a mobile terminal moves from one MAG network to another, it is difficult for the MAG to recognize that the mobile terminal is detached in the area. Therefore, there is a problem that the LMA takes the form of notifying the MAG upside down during the registration process of the new MAG.

In addition, even when the mobile terminal moves to a new network, an authentication procedure is required, and additional negotiation process such as a rough QoS profile and a service profile is already required, thereby increasing handover time.

Accordingly, the present invention is to solve the above problems and handover by transferring the user profile, QoS profile, service profile, AAA status information of the mobile terminal through message exchange between the MAG and the previous MAG when the mobile terminal handovers. And a method for exchanging information between access gateways for supporting network-based mobility which reduces profile acquisition and binding update time.

In order to solve the above technical problem, a method of exchanging information between access gateways according to an aspect of the present invention is directed to a system for supporting network-based mobility when a mobile terminal moves from a first access network to a second access network. Information exchange method between access gateways

Identifying, by an access gateway of the second access network, the entry of the mobile terminal into the second access network area; Requesting and obtaining a profile of the mobile terminal from an access gateway of the first access network; And binding information for the mobile terminal in a local mobility anchor performing a home gateway function for the mobile terminal through an access gateway of the second access network using a profile of the mobile terminal obtained from the first access network. Updating the;
The method of exchanging information between access gateways according to another aspect of the present invention is a method of exchanging information between access gateways in a system for supporting network-based mobility when a mobile terminal moves from a first access network to a second access network.
An access gateway of the first access network recognizing entry of the mobile terminal into the second access network area; Transmitting the profile of the mobile terminal to an access gateway of the second access network; And deleting the binding information for the mobile terminal.

According to the configuration of the present invention by the above-described configuration, in the technology for supporting network-based mobility, there is an effect that the router can provide the mobility of the flow unit, not the mobility of the mobile terminal.

In addition, by extending the information of the existing flow-based router, the flow information can be linked with the binding cache entry without signaling, it can be expected to implement the flow unit mobility without additional network traffic.

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.

Throughout the specification, when a part is said to "include" a certain component, it means that it can further include other components, without excluding other components unless specifically stated otherwise. In addition, the terms “… unit”, “… unit”, “module”, etc. described in the specification mean a unit that processes at least one function or operation, which may be implemented by hardware or software or a combination of hardware and software. have.

In the present specification, a mobile node (MN) includes a mobile station (MS), a terminal, a terminal, a mobile terminal (MT), a subscriber station (SS), and a portable subscriber station (Portable Subscriber Station). , PSS), a user equipment (UE), an access terminal (AT), and the like, and may include all or some functions of a mobile terminal, a subscriber station, a mobile subscriber station, a user device, and the like. It may be.

In the present specification, a base station (BS) is an access point (AP), a radio access station (Radio Access Station, RAS), a Node B (Node B), a base transceiver station (Base Transceiver Station, BTS), MMR ( Mobile Multihop Relay) -BS and the like, and may include all or part of functions such as an access point, a radio access station, a Node B, a base transceiver station, and an MMR-BS.

Now, a method of exchanging information between access gateways for supporting network-based mobility according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 illustrates a system structure for supporting network-based mobility according to an embodiment of the present invention.

Referring to FIG. 1, a network-based mobility support system according to an exemplary embodiment of the present invention manages mobile node (MN) 10 and home binding information of a mobile terminal 10 and manages address resources of the terminal. Local Mobility Anchor (LMA) 100 to allocate, a Mobile Access Gateway (MAG) 200 connecting a wireless access network and a core network, and a counterpart terminal (Correspondent Node, CN) providing services to the mobile terminal 10. And 20.

In addition, although omitted in the drawing, an access point (AP) connected to the mobile terminal 10 through a wireless access network, and an authentication server (AAA) for performing wireless access network authentication for the mobile terminal 10 and the user It further includes.

The mobile terminal 10 is a portable terminal such as a laptop and a PDA having mobility, and receives a wireless packet data service by accessing an AP through a wireless channel.

The LMA 100 may be a home agent that manages location information of the mobile terminal 10 or the counterpart terminal 20 in the network as a local mobility anchor.

The MAG 200 provides a mobility function to the mobile terminal 10 as a kind of router connecting a wireless access network and a core network, and the mobile terminal 10 may have moved from the first network to another second network. In order to distinguish the time, the first MAG 210 and the second MAG 220 are called.

 The network-based mobility support system according to an exemplary embodiment of the present invention is a structural diagram of a mobile communication system as a network, and may be applied to, for example, a Mobile World Interoperability for Microwave Access (Mobile WiMAX) system or other mobile communication systems. .

Hereinafter, in the embodiment of the present invention, in implementing network-based flow mobility, when the mobile terminal 10 moves, a method and procedure for communicating between the MAGs 200 to reduce handover time and the mobile terminal 10 Information on the following will be described.

According to the exemplary embodiment of the present invention illustrated in FIG. 1, the mobile terminal 10 moves to the second MAG 220 area while communicating with the counterpart terminal 20 through the LMA 100 and the first MAG 210. It is assumed that the logical communication is performed at the position of the mobile terminal 10 '.

The second MAG 220 obtains profile information for mobility management for the mobile terminal 10 newly entering its management area, and updates binding information in the LMA 100.

At this time, according to an embodiment of the present invention, the second MAG 220 requests the neighboring first MAG 210 for the profile of the newly entered mobile terminal 10. As described above, when the mobile terminal 10 enters a new network, the mobile station 10 undergoes an authentication procedure and needs to negotiate a rough QoS profile, a service profile, and the like. This additional process causes a problem of increasing handover time.

In addition, the first MAG 210 does not know the information that the mobile terminal 10 in its management area has moved to the second MAG 220 network, at this time, the first according to an embodiment of the present invention The MAG 210 may receive the movement information from the second MAG 220 of the network to which the mobile terminal 10 has moved and may know the information that the mobile terminal 10 has moved in the fastest time. Therefore, the tunnel associated with the LMA 100 of the first MAG 210 may be deleted, or may help to update the binding.

Such a method of exchanging information between access gateways supporting network-based mobility according to an embodiment of the present invention will be described briefly with reference to FIG. 1.

The second MAG 220, which is a new access router of the mobile terminal 10, acquires an MN identifier, an access technology type, and a home network prefix (es) of the mobile terminal 10. Using this, a profile request message is generated and transmitted to the first MAG 210 which is a router of the previous access network (S101).

The first MAG 210, which is a router of the previous access network of the mobile terminal 10, receives the profile request message and determines that the mobile terminal 10 is detached from its own area. The first MAG 210 generates an MN profile response message for the profile request message and transmits the generated MN profile response message to the second MAG 220 (S102). In this case, the MN profile response message transmitted further includes profile information such as a user profile, a QoS profile, a service profile, and an authentication profile in the information received through the profile request message.

Accordingly, according to an exemplary embodiment of the present invention, binding information may be quickly updated by performing communication between the second MAG 220 of the accessed access network and the first MAG 210 of the previous access network. And, it is possible to obtain profile information for the mobile terminal 10, respectively.

Meanwhile, a procedure of exchanging user profiles between access gateways (MAGs) for supporting network-based mobility according to an embodiment of the present invention will be described in more detail with reference to FIG. 2.

2 is a flowchart illustrating a procedure of exchanging user profiles between MAGs for a mobile terminal according to an embodiment of the present invention.

The user profile exchange procedure of FIG. 2 is similar to the configuration of FIG. 1 and the second MAG 220 while the mobile terminal 10 communicates with the counterpart terminal 30 through the LMA 100 and the first MAG 210. Assume a case where communication is performed at the location of the mobile terminal 10 'logically.

Referring to FIG. 2, when the mobile terminal 10 moves from the first MAG 210 to the second MAG 220, the second MAG 220 may be assisted by L2. Receiving a Router Solicitation (RS) message from the mobile terminal 10, the mobile terminal 10 determines that the mobile terminal 10 has entered its own area (S201).

Then, the second MAG 220 obtains information such as an MN identifier, an access technology type, a home network prefix (es) of the mobile terminal 10 from the LMA 100, and the like. Then, using this to generate an MN Profile Request message (MN Profile Request) to transmit to the neighboring first MAG 210 (S202), the MN profile request message is to be transmitted in the form of multicast or unicast It may be.

When the first MAG 210 receives the MN profile request message from the second MAG 220, the first MAG 210 recognizes that the mobile terminal 10 moves to another access network (S203). Thus, the first MAG 210 generates a response message for the MN profile request and transmits it to the second MAG 220 (S204).

Then, the first MAG 210 performs a process for deleting the tunnel between the LMA (100) (S205).

That is, the first MAG 210 requests the deregistration to the LMA 100 using a proxy binding update (PBU) message in which the lifetime is set to 0 (S206). When receiving a Proxy Binding Ack (PBA) message from the LMA 100 according to the request, the tunnel between the LMAs 100 is deleted (S207). At this time, the first MAG 210 deletes the binding update list managed (S208).

In contrast, when the second MAG 220 receives the MN profile response message from the first MAG 210, the second MAG 220 transmits a proxy binding update (PBU) message to the LMA 100 to update binding information (S209).

The LMA 100 responds by sending a binding update response (BUA) message corresponding to the proxy binding update (PBU) of the second MAG 220 to the second MAG 220 (S210), and the second MAG 220 responds. In operation S211, a binding update list (BUL) is generated according to the reception of the binding update response (BUA) message. That is, a bi-directional tunnel is made between the LMA 100 and the second MAG 220 (S212).

The second MAG 220 generates a Router Advertisement (RA) message for the Router Advertisement (RS) message and transmits it to the mobile terminal 10 (S213).

In the description of FIG. 2, for the sake of convenience, steps S205 to S208 have been described as an operation flow centering on the first MAG 210, and steps S209 to S212 are described as an operation flow centering on the second MAG 220. As shown, the first MAG 210 and the second MAG 220 operate in a sequential flow.

In this case, the tunnel deletion between the first MAG 210 and the LMA 100 may be performed after the second MAG 220 updates binding information to the LMA 100 and generates a bi-direction tunnel. It is preferable to make.

That is, after the connection with the new second MAG 220 is terminated, the tunnel of the existing first MAG 210 is cleared, thereby preventing loss when there is a packet transmitted and received by the mobile terminal 10. Can be.

As described above, according to an embodiment of the present invention, in a technology for supporting network-based mobility, a router (MAG) may provide mobility in units of flows rather than mobility of the mobile terminal 10, and is based on existing flows. By extending the information of, the flow information can be linked with the binding cache entry without signaling, there is an advantage that can implement the flow unit mobility without additional network traffic.

The embodiments of the present invention are not limited to the above-described apparatuses and / or methods, but may be implemented through a program for realizing functions corresponding to the configuration of the embodiment of the present invention, a recording medium on which the program is recorded And such an embodiment can be easily implemented by those skilled in the art from the description of the embodiments described above.

Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts of the present invention defined in the following claims are also provided. It belongs to the scope of rights.

1 illustrates a system structure for supporting network-based mobility according to an embodiment of the present invention.

2 is a flowchart illustrating a procedure of exchanging user profiles between MAGs for a mobile terminal according to an embodiment of the present invention.

Claims (9)

A method of exchanging information between access gateways in a system for supporting network-based mobility when a mobile terminal moves from a first access network to a second access network, Identifying, by an access gateway of the second access network, the entry of the mobile terminal into the second access network area; Obtaining and requesting, by the access gateway of the second access network, the access gateway of the first access network a profile of the mobile terminal, wherein the profile of the mobile terminal includes a user profile, a QoS profile, a service profile, and an authentication profile? ; And Binding information for the mobile terminal in the local mobility anchor performing a home gateway function for the mobile terminal through the access gateway of the second access network using the profile of the mobile terminal obtained from the first access network. Step to update Information exchange method between the access gateway comprising a. The method of claim 1, The obtaining step, Receiving, by the access gateway of the second access network, identification information for the mobile terminal from the local mobility anchor; Generating a profile request message for the mobile terminal using the identification information; Transmitting the generated profile request message to an access gateway of the first access network; Receiving a response message to the profile request message from an access gateway of the first access network; And Obtaining a profile for the mobile terminal included in the response message received Information exchange method between the access gateway comprising a. 3. The method of claim 2, Updating the binding information, Requesting, by the access gateway of the second access network, a proxy binding update for the mobile terminal to the local mobility anchor; Receiving a response to the binding update from the local mobility anchor; And Creating a bidirectional tunnel with the local mobility anchor Information exchange method between the access gateway comprising a. The method of claim 3, In the determining, the access gateway of the second access network, the information exchange between the access gateways, characterized in that the mobile terminal enters the area of the second access network by a router request from the mobile terminal. Way. 5. The method of claim 4, After creating the bidirectional tunnel, The access gateway of the second access network further comprises the step of generating a router response to the router request and transmitting to the mobile terminal. A method of exchanging information between access gateways in a system for supporting network-based mobility when a mobile terminal moves from a first access network to a second access network, An access gateway of the first access network recognizing entry of the mobile terminal into the second access network area; Transmitting the profile of the mobile terminal to an access gateway of the second access network; And Deleting the binding information for the mobile terminal, In the step of recognizing, the access gateway of the first access network is to enter the second access network area of the mobile terminal by the request of the profile for the mobile terminal received from the access gateway of the second access network. Information exchange method between access gateways characterized in that the recognition. delete The method of claim 6, In the deleting step, the access gateway of the first access network deletes a bidirectional tunnel formed between the local mobility anchor performing a home gateway function for the mobile terminal. Way. The method of claim 8, The deleting of the bidirectional tunnel is performed after the bidirectional tunnel is created between the access gateway of the second access network and the local mobility anchor.

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