KR100895295B1 - Method for processing renumbering of home network prefix - Google Patents

Abstract

In the home network prefix renumbering processing method according to the present invention, the mobility mobility gateway (Local Mobility Anchor (LMA)) in the first message containing the fact that the change of the home network prefix (Home network prefix) information mobility mobility gateway (Mobility Access Gateway) Transmitting to; Sending, by the mobility access gateway, a response in a second message to a local mobility anchor; And transmitting, by the mobility access gateway, the fact of the change of home network prefix information to the mobile node by including a third message in the third message. When the PMIPv6 technology is supported in the 3GE access system, the local mobility anchor is mobility. By notifying the access gateway of the change of home network prefix information, the mobility access gateway knows when to send the mobile node by setting the lifetime of the home network prefix in the Router Advertisement message to 0 and sending it to the mobile node. By quickly detecting changes in information, you can reconnect to the Internet faster.

3G Evolution (3GE) Access System, Network-Based Mobility, Proxy Mobile IPv6, Home Network Prefix Renumbering

Description

Method for processing renumbering of Home Network Prefix}

The present invention relates to a processing method between a mobility access gateway and a local mobility anchor when home network prefix renumbering occurs in Proxy Mobile IPv6 (hereinafter referred to as "PMIPv6") of a 3rd generation evolution (3GE) access system.

The present invention is derived from research conducted as part of the IT growth engine core technology development project of the Ministry of Information and Communication and the Ministry of Information and Communication Research and Development. [Task Management No.:2005-S-404-23, Project Name: 3G Evolution Access System] .

The 3GE access system is an IP-based wireless packet access network suitable for providing high quality multimedia services. 3GE can collectively refer to any system that evolves based on 3GPP or 3GPP2. In addition to the basic requirements of high quality and good security, the main features of the 3GE access system are existing 3G access systems or competitive systems while simultaneously satisfying both low cost and high rate. It aims to improve the radio and network technology so that it can be differentiated from others.

In addition, the 3GE access system is a system in which a base station can be selected according to a service characteristic desired by a subscriber along with a high-speed wireless packet transmission technology, and a convergence technology of Multi-RAT such as WLAN / GSM / GPRS / UTRAN / HSDPA / Emerging System and these It is essential to provide service continuity, and in this multi-RAT environment, the subscriber can selectively access the base station which is advantageous for communication quality and billing according to the subscriber's location, radio environment and service characteristics. Operators are building global resources and mobility management systems to effectively support wireless resources, increase subscriber capacity through traffic distribution between base stations, and support economic facility infrastructure investment and operation.

In order to keep the connection of Internet services even when the Mobile Node (MN) moves between subnets, the Mobile Node (HA) and Mobile IPv6 (MIPv6) operation can perform a seamless service. You can keep getting it. However, since the MIPv6 protocol is a node-based mobility support protocol, a node that does not implement the MIPv6 function needs to terminate the existing connection and open a new connection every time it moves from one subnet to another. . In order to prevent this, the PMIPv6 technology has been proposed to support the mobility of nodes in the access network so that the existing connection can be maintained even if the node without the MIPv6 function is moved. It is called a base mobility management technique. The PMIPv6 protocol is a protocol for supporting network mobility for a mobile node that does not support the mobility protocol. The PMIPv6 protocol includes a local mobility anchor and a mobility access gateway. The local mobility anchor acts as a kind of home agent for the mobile node inside the access network, and the mobility access gateway supports the mobility of the mobile node on behalf of the mobile node.

Mobile nodes equipped with MIPv6 nodes may or may not be connected to the 3GE access system. If a node without a MIPv6 node is connected, the 3GE access system must support PMIPv6 technology to provide network-based mobility management to the mobile node. When PMIPv6 is supported in the 3GE access system, mobile nodes can receive seamless service when moving between subnets, and mobility access gateway and local mobility anchor manage binding information and tunnels for mobile nodes. If the home network prefix information changes while the mobile node is receiving Internet service, the mobility access gateway and local mobility anchors delete the routing state for the previous prefix, and the mobility access gateway relocates the mobile node's old home in a Router Advertisement message. Set the network prefix lifetime to 0 and send it to the mobile node.

However, the PMIPv6 draft does not describe how the local mobility anchor will notify the mobility access gateway when the home network prefix information has changed. The PMIPv6 draft also does not use the Mobile Prefix Discovery mechanism. In order for the mobility access gateway to send the mobile node with the lifetime of the mobile node's previous home network prefix set to 0 in the Router Advertisement message, it must be notified of the change in home prefix information from the local mobility anchor and a procedure for such notification method is required. Do.

The technical problem to be achieved by the present invention is therefore to provide an efficient way for the local mobility anchor to notify the mobility access gateway of this fact when the home network prefix is changed.

In order to achieve the above object, the processing method when home network prefix renumbering occurs in PMIPv6 of the 3GE access system according to the present invention includes the fact that a local mobility anchor (LMA) changes the home network prefix information. Transmitting in a message to a mobility access gateway; Sending, by the mobility access gateway, a response in a second message to a local mobility anchor; And transmitting, by the mobility access gateway, the fact of the change of home network prefix information to the mobile node in a third message.

According to the processing method when home network prefix renumbering occurs in PMIPv6 of the 3GE access system according to the present invention, when PMIPv6 technology is supported in the 3GE access system, the local mobility anchor notifies the mobility access gateway of the change of home network prefix information, thereby enabling mobility access. The gateway knows when to send the mobile node the lifetime of its home network prefix in the Router Advertisement message to zero.

Therefore, the mobile node can detect the change of the home network prefix information quickly and perform the internet reconnection faster.

In order to achieve the above technical problem will be described in detail with reference to the accompanying drawings a processing method when the home network prefix renumbering occurs according to the present invention.

1 shows a structure in which PMIPv6 is applied to a 3GE access system to which the present invention is applied. The 3GE access system consists of the following nodes. The 3GE mobile terminal system (hereinafter referred to as "3GE-UE") 101 is a mobile node supporting high-speed mobile packet / multimedia communication and supports dual-mode to accommodate both 3GE and non-3GPP interfaces. A variety of packet services can be provided through heterogeneous network handover between the 3GE access system and the 3GE access system. The 3GE base station (E-NodeB: Evolution-RAN, 102) manages radio resources and performs a function of managing a radio bearer. The aGW (Access Gateway) 103 controls and manages handover between 3GE base stations, performs session management, and performs traffic processing between a 3GE access system and a 3GE operator IP service network for processing user data. The aGW also functions as a mobility access gateway to support network-based mobility. Similarly, the local mobility anchor 104 also performs a PMIPv6 function to support network-based mobility for mobile nodes. In addition, in the 3GE access system, an access point (AP) 105 wirelessly connected to the 3GE-UE to support inter-working with WLAN (I-WLAN), WLAN and IP backbone (IP) WLAN Access Gateway (WAG) 106 that performs connectivity with Backbone, 113, and Packet Data Gateway (PDG, 107) that performs IP packet transmission processing to WLAN wireless access devices. It is composed. The Home Location Register (HLR) 108 stores information on additional services of subscribers and provides information necessary to perform services. Authentication server (Authentication, Authorization, Account: AAA, 109) performs authentication, authorization verification, billing functions. It serves as an access point for content providers to provide content in order to provide next generation network multimedia based service (IPS) that provides multimedia such as voice, audio, video and data based on IP protocol. BM-SC (Broadcast Multicast-Service Center, 110) server and proxy function, a kind of firewall function to protect home network, IMS service broker (Proxy CSCF / Interrogating CSCF / Serving: CSCFP / I / S -CSCF, 111) nodes.

FIG. 2 is a flowchart illustrating a process of PMIPv6 when the mobile node moves into the PMIPv6 domain of the 3GE access system.

When the mobile node 101 accesses the 3GE access system, a 3GE radio access procedure is performed between the mobile node and the E-NodeB 102 (201), and then the mobile node, E-NodeB, mobility access is performed to perform 3GE user authentication. An authentication procedure is performed between the gateway 103 and the AAA server 109 (202). The RADIUS or Diameter protocol can be used as the AAA protocol between the Mobility Access Gateway and the AAA server. After successful authentication, the mobility access gateway 103 receives information such as an MN's identifier, a local mobility anchor address, an address allocation method for generating a home address, and the like from the AAA server 109 (203). The mobility access gateway 103 acts as a home emulator for the mobile node and transmits the identifier information of the mobile node to the local mobility anchor 104 in the Proxy Binding Update message (204).

The local mobility anchor 104 generates a binding cache entry for the mobile node (205), and transmits the identifier of the mobile node and the home prefix information to the mobility access gateway 103 in the Proxy Binding Acknowledgement message (206). The mobility access gateway 103 generates a binding cache entry for the mobile node 101 (207) and transmits home network prefix information, an address allocation method, and the like to the mobile node in a Router Advertisement message (208). The mobile node generates a home address stateful or stateless according to the address allocation method (209).

3A to 3B illustrate a message structure proposed by the present invention for exchanging between a mobility access gateway and a local mobility anchor when a home network prefix is changed.

FIG. 3A is a Home-Prefix-Renumbering-Notification message sent by the local mobility anchor 104 to the mobility access gateway 102 in order to notify the home network prefix of change (expressed as “first message” in the claims). ) Shows the structure. FIG. 3B illustrates a Home-Prefix-Renumbering-Acknowledgement message sent by the mobility access gateway 102 to the local mobility anchor 104 in response to a Home-Prefix-Renumbering-Notification message (“second message” in the claims). The structure is shown. Descriptions of the detailed fields of each message are as follows. In the Type fields 303, 316, and 320, a Home-Prefix-Renumbering-Notification message or a Home-Prefix-Renumbering-Acknowledgement message value is set. In this patent, it is defined as 1000 (301) and 1001 (302,321), respectively. Sequence Number fields 304,311 and 324 are used to indicate the sequence number of the message and the sequence number value of the Home-Prefix-Renumbering-Notification message (FIG. 3A) sent by the local mobility anchor 104. Is used as the Sequence Number value of the Home-Prefix-Renumbering-Acknowledgement message (FIG. 3B) sent by the mobility access gateway 103.

Length fields 305, 313, and 325 indicate the total length of the message. The reserved field 306 is a reserved area, and is set to 0 when the Local Mobility Anchor 104 sends a Home-Prefix-Renumbering-Notification message to the Mobility Access Gateway 103, and Home-Prefix-Renumbering- The mobility access gateway 103 receiving the notification message does not interpret this part. The Status field 307 is the part that sets the result of the success or failure of the response that the Mobility Access Gateway sends to the local mobility anchor for the Home-Prefix-Renumbering-Notification message (FIG. 3A).

The Mobile Node Identifier Option fields (308, 315, 328) follow the RFC 4283 standard. The Old Home Network Prefix Option field 309 and the New Home Network Prefix Option field 310 follow the Home Network Prefix Option defined in the IETF Proxy Mobile IPv6 draft.

FIG. 4 is a flowchart illustrating a process in the case where the home network prefix is changed while receiving the Internet service after the mobile node accesses the PMIPv6 domain of the 3GE access system. Hereinafter, the process will be described in detail with reference to FIG. 4. The mobility access gateway 103 and the local mobility anchor 104 manage binding cache entries for the mobile node (401). Data traffic delivery between the mobile node 101 and the correspondent node (CN 112) is mobility. It is transmitted 402 through tunneling between the access gateway 103 and the local mobility anchor 104. If a change in home network prefix information occurs while the mobile node is using the Internet service (403), the local mobility anchor 104 sends a Home-Prefix-Renumbering-Notification message (FIG. 3A) to the mobility access gateway (404). The mobility access gateway sends a Home-Prefix-Renumbering-Acknowledgement message (FIG. 3B) to the local mobility anchor in response. This allows the mobility access gateway 103 to recognize that the mobile network's home network prefix information has changed. The mobility access gateway 103 sets and transmits the home network prefix life time of the Router Advertisement message to the mobile node 101 to terminate the Internet service of the mobile node 101 using the previous home network prefix (406). ). The mobility access gateway 103 and the local mobility anchor 104 delete the binding cache entry and the routing information of the mobile node 101 (407). The mobile node 101 performs a 3GE connection procedure and a Proxy Mobile IPv6 procedure again between the mobile node, the E-NodeB, the mobility access gateway, the local mobility anchor, and the AAA server to reconnect to the 3GE access system (408).

The invention can also be embodied as computer readable code on a computer readable recording medium. Computer-readable recording media include all kinds of recording devices that store data that can be read by a computer system. Examples of computer-readable recording media include ROM, RAM, CD-ROM, magnetic tape, floppy disks, optical data storage devices, and the like, which are also implemented in the form of carrier waves (for example, transmission over the Internet). Include. The computer readable recording medium can also be distributed over network coupled computer systems so that the computer readable code is stored and executed in a distributed fashion. In addition, functional programs, codes, and code segments for implementing the present invention can be easily inferred by programmers in the art to which the present invention belongs.

Although the present invention has been described with reference to the embodiments shown in the drawings, this is merely exemplary, and it will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible. Therefore, the true scope of protection of the present invention should be defined only by the appended claims.

In addition, terms such as a mobile node, an E-NodeB, a mobility access gateway, a local mobility anchor, an AAA server, a 3GE access procedure, and a Proxy Mobile IPv6 have been used, but these terms can be used by any person having ordinary knowledge in the field of the present invention. Detailed description is omitted since it is understood.

1 is a diagram illustrating a 3GE access system structure.

2 is a flowchart illustrating a process of PMIPv6 when the mobile node moves into the PMIPv6 domain of the 3GE access system.

3A to 3B illustrate a message structure exchanged between a mobility access gateway and a local mobility anchor when a home network prefix is changed.

4 is a flowchart showing a process when a home network prefix is changed.

Claims (6)

Transmitting, by a local mobility anchor (LMA), a change of home network prefix information to a mobility access gateway in a first message; Sending, by the mobility access gateway, a response in a second message to a local mobility anchor; And And transmitting, by the mobility access gateway, the facts of the change of home network prefix information to a mobile node by including a third message in a third message. The method of claim 1, wherein prior to the local mobility anchor transmitting a change of home network prefix information. And detecting, by the local mobility anchor, that a change in home network prefix information has occurred. The method of claim 1, wherein the first message is A header including a first type field indicating a notification signal, a first serial number field indicating the order of the first message, a first length field indicating the size of the first message, and a reserved field; And a processing method when home network prefix renumbering occurs. The method of claim 1, wherein the second message A value of a second type field indicating an acknowledgment signal, a second serial number field indicating the order of the second message, a second length field indicating the size of the first message, or a response success or failure response; And a header including a status field to have a home network prefix renumbering. The method of claim 4, wherein the second serial number field is And a first serial number field value indicating a sequence of the first message. The method of claim 1, wherein the third message is A Router Advertisement message, characterized in that the home network prefix life time value is set to zero.

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