KR20210054221A - Hybrid multicast routing wireless sensor information transmission management system and method for providing context-aware flow in multiple radio access technology - Google Patents

Abstract

The present invention relates to a handover operation method for seamless mobility support and efficient network resource management when a handover necessity of a mobile node (MN) is detected. The handover operation method introduces an advanced mobility anchor point (AMAP), which is hierarchical regional mobility management, to a fast handover extension for PMIPv6 (FHPMIPv6) network and enables organic buffer management, thereby enabling systematic buffer management and reducing waste of wireless link resources.

Description

Hybrid multi-routing wireless sensor information transmission management system and method for providing context-aware flow of multiple wireless access technology {HYBRID MULTICAST ROUTING WIRELESS SENSOR INFORMATION TRANSMISSION MANAGEMENT SYSTEM AND METHOD FOR PROVIDING CONTEXT-AWARE FLOW IN MULTIPLE RADIO ACCESS TECHNOLOGY}

The present invention relates to a hybrid multi-routing wireless sensor information transmission management system and method for providing a context-aware flow of a multi-radio access technology for handover between heterogeneous networks.

With the recent development of ubiquitous sensor network technology, research on technology for transmitting information collected from various sensors through wireless or mobile communication networks is being actively conducted. In addition, starting with the provision of smart IoT platform services through IoT technology, efforts to realize a ubiquitous society and a hyperconnected society are progressing beyond the pilot stage to the level that can be commercialized.

In addition, as the number of smart device users is greatly increased according to the development of the mobile communication environment, data usage due to the activation of multimedia streaming services is also on the rise. As the demand for such high-quality multimedia convergence content services accelerates, data traffic usage in 2020 is predicted to increase 1,000 times or more compared to 2010.

Accordingly, in order to provide a service with guaranteed quality of service (QoS) through information collected from various sensors, it is necessary to preemptively solve the problem of increasing network load due to traffic increase. For this, efficient network resource management and mobility support technology through seamless mobility support between heterogeneous networks are required.

As described above, in order to guarantee QoS, the MIH (Media Independent Handover) technology, which supports seamless mobility between heterogeneous networks and efficiently manages network resources, has been standardized. The MIH technology is in charge of a practical bridging role between the L2 (Layer2) and L3 (Layer3) layers, and is a technology that supports session continuity through interaction between upper and lower layers through information exchange with IS (Information Server). .

However, even today, the problem of increasing network load due to the increase of multimedia streaming traffic, flow mobility between heterogeneous networks, and traffic overload, as well as packet loss problems and context-awareness problems due to the location registration procedure performed when the location information for the service area is updated Traffic problems that occur between various access networks, such as route optimization services, are still technical challenges to be solved.

Korean Patent Publication No. 10-2034842 (“A method and apparatus for handover based on context information in a heterogeneous network environment”) Korean Registered Patent Publication No. 10-1901109 (“Hybrid convergence network management system and method that provides stable traffic transmission through enhancement of wireless resource efficiency”)

The present invention has been conceived to solve the above-described problems, and an object of the present invention is generated from different network interface environments in order to solve the problem of increase in load due to transmission of signaling messages that occur when frequent handover requests between heterogeneous networks are made. It is to provide a handover operating system and method capable of proactively grasping a part of whether or not it is only for session movement within the same network.

A handover operation method according to an embodiment of the present invention for achieving the above object, when the need for handover of a mobile node (MN) is detected, a service network (PMAG: Previous Mobile Access Gateway). An information confirmation step of requesting information on a candidate network (NMAG) adjacent to the mobile terminal by communicating with a Media Independent Information (MII) server; An information providing step of providing information on the candidate network to a mobile terminal when the service network receives at least one candidate network from the MII server; An availability check step of the service network communicating with the candidate network to check resource availability; When one of the at least one candidate network (NMAG 1 to NMAG N) is determined, the service network communicates with the selected candidate network to transmit HI (Handover Intiate) information, and HACK (Handover Acknowledgement). ) Resource preparation step of receiving information; And performing a handover in which the mobile terminal receives a packet through the selected candidate network.

In this case, after the resource preparation step, the present invention may further include a Local Blinding Update step in which the service network communicates with an Advanced Mobility Anchor Point (AMAP) to update the binding of the mobile terminal.

The present invention includes a location update step of updating BCE (Binding Cache Entry) information by transmitting and receiving information between the service network and a local mobility anchor (LMA) server after the region binding update step; And after the location update step, a path optimization step of transmitting and receiving information between the LMA server and the selected candidate network for a routing path optimization operation.

In the present invention, in the location update step, the service network and the LMA server transmit and receive each other FPBU (Fast Proxy Binding Update) and FPBAck (Fast Proxy Binding Acknowledgement) messages, and in the route optimization step, the LMA server and the selected The candidate networks may be formed to transmit and receive a Reverse Proxy Binding Update (RPBU) and Reverse Proxy Binding Acknowledgement (RPBA) message with each other.

In the present invention, in the path optimization step, when the LMA server and the selected candidate network transmit and receive information, the selected candidate network may transmit a router advertisement (RA) message to the mobile terminal.

In addition, in the present invention, when a packet is transmitted from a Correspondent Node before the handover performing step, a buffering operation of the packet is performed in a Local Mobility Anchor (LMA) server and an Advanced Mobility Anchor Point (AMAP) to the service network. A received first buffer management step; And a second buffer management step of performing a packet buffering operation in the service network and transmitting the packet to the selected candidate network, wherein the selected candidate network transfers the received packet to the mobile terminal.

In the handover operation method according to an embodiment of the present invention for achieving the above object, a service network transmits AP (Access Point) information around a mobile node (MN) to IAPP (Inter Access Point Protocol). Information collection step of collecting using ); An information providing step of providing the AP information collected by the service network to the mobile terminal when the need for handover of the mobile terminal is detected; A network selection step of selecting one AP from among APs collected from the mobile terminal or service network, and communicating with a target network including the AP; A resource preparation step in which the service network communicates with the target network to transmit HI (Handover Intiate) information and receive HACK (Handover Ack.) information; And performing a handover in which the mobile terminal receives a packet through the selected candidate network.

At this time, the HI information and HACK information includes at least one or more of a Mobile Node Identifier (MN-ID), a Host Negotiation Protocol (HNP), a Link Layer Identifier (LL-ID), and a Media Independent Handover Function Identifier (MIHF-ID). Can be included.

In the present invention, in the handover performing step, when a packet is transmitted from a Correspondent Node, it is transmitted to the mobile terminal through a Local Mobility Anchor (LMA), an Advanced Mobility Anchor Point (AMAP), and a selected candidate network. It can be characterized by that.

The handover operation method of the present invention with the configuration as described above further reduces the waste of radio link resources in the overlapped area by transmitting and receiving HI and HACK information between the service network and the selected candidate network prior to notifying the mobile terminal. In addition, there is an advantage in that it is more efficient to maintain the list of binding updates on the LMA server and AMAP.

In addition, the present invention has an advantage in that packet loss can be reduced through more organic and systematic buffer management, and more efficient load distribution management is possible.

1 is a diagram showing a rule in a general MIH procedure.
2 is a diagram showing a handover operation method according to the prior art.
3 is a system configuration diagram according to an embodiment of the present invention.
4 is a diagram showing a handover operating method according to an embodiment of the present invention.
5 is a diagram showing a handover operation method according to another embodiment of the present invention.
6 is a comparison diagram of the handover delay time of the prior art and the present invention.

Hereinafter, a handover operation method according to various embodiments of the present invention will be described in detail with reference to the accompanying drawings. The drawings introduced below are provided as examples in order to sufficiently convey the spirit of the present invention to those skilled in the art. Therefore, the present invention is not limited to the drawings presented below and may be embodied in other forms. In addition, the same reference numbers throughout the specification indicate the same elements.

If there are no other definitions in the technical and scientific terms used at this time, they have the meanings commonly understood by those of ordinary skill in the art to which this invention belongs, and the gist of the present invention is unnecessary in the following description and accompanying drawings. Descriptions of known functions and configurations that may be blurred will be omitted.

1 and 2 are related to a conventional handover operation method, FIG. 1 is a diagram showing a rule in the MIH procedure, and FIG. 2 is a diagram showing a handover operation method.

Referring to FIG. 1, in MIH (Media Independent Handover), it is largely divided into three types: MN to Network, Network to MN, and Network to Network. And if it is classified as above, it is useful to determine the appropriate protocol according to the starting point and the destination point, and to call the related parameters. Therefore, when performing the MIH command, the naming convention must comply with the rule defined in FIG. 1, and the destination point is limited to only remote commands. In addition, FIG. 1 additionally shows the contents of a parameter of a command generated when a handover request according to the MIH is requested. When the mobility of the terminal is directly managed, the candidate network (MAG: Mobile Access Gateway) can be selected by the mobile terminal (MN: Mobile Node), and the candidate network list is displayed through the MIHF (Media Independent Handover Function) service in the network. Inquiries and requests for resource provision can be reserved in advance, and handover operation status can be displayed.

In addition, when the mobility of the terminal is managed by the network, the network not only can query the list of resources currently used by the mobile terminal, but also can reserve necessary resources for target candidate networks. It is also possible to give a command for performing handover to the mobile terminal.

Referring to FIG. 2, basically, a mobile terminal receives a packet through an LMA (AAA Server: Authentication Authorization Accounting Server), which is a component of PMIPv6, and a service network (MAG1) that is currently being provided. In addition, when the mobile terminal detects the need for handover, it acquires information on the neighboring network through an information server (IS). At this time, when performing network-based handover, Point of Attachment (PoS) of the service network delivers the [MIH_Net_HO_Candidate_Query Request] message to the mobile terminal to trigger the handover procedure, and the response message is handed through the [MIH_Net_HO_Candidate_Query Response] message. It receives information on whether to perform over and suitable PoS.

In addition, the PoS of the service network transmits a [MIH_N2N_HO_Query_Resource Request] message to various candidate networks in order to check the availability of resources of various candidate networks, and the various candidate networks send a [MIH_N2N_HO_Query_Resource Response] message to the candidate networks. By transmitting to the service network, the PoS determines the handover target through the corresponding procedure.

In addition, the PoS of the service network that has determined the handover target through the [MIN_N2N_HO_Query_Resource Response] message exchanges the [MIH_N2N_HO_Commit Request / Response] message with the PoS of the candidate network to request resource provision from the candidate network to be provided in the future. In addition, the candidate network receiving the [MIH_N2N_HO_Commit Request] message can obtain PMIPv6 process information corresponding to the mobile terminal through Authentication Authorization Accounting (AAA) server authentication, and store it in a Policy Server (PS).

In addition, the PoS of the service network notifies the mobile terminal of the result of the handover target determination through the [MIH_Net_HO_Commit Request] message, and receives a response to the result through the [MIH_Net_HO_Commit Response] message. Therefore, the mobile terminal can establish an L2 (Layer2) connection with the PoS of the selected candidate network, and thus PBU (Proxy Binding Update) and PBAck (Acknowledgement) with the LMA to register the location of the mobile terminal and maintain BCE (Binding Cache Entry). Messages are exchanged, and the PMIPv6 client, which has received the PBAck message, transmits the mobile terminal information obtained from the PS and LMA to the mobile terminal through a router advertisement (RA) message.

In addition, the information transmitted in this way is periodically transmitted by RS (Router Solicitation) message, and the interface IP address used to connect to PoS of the current target candidate network is configured through RA (Router Advertisement) message. When the corresponding procedure is completed, the mobile terminal can receive packets through the LMA, which is a component of PMIPv6, and the currently provided service (MAG2). Here, in order to complete all procedures required for a handover request, a [MIH_N2N_HO_Complete Request / Response] message for performing a resource release procedure must be exchanged with the network PoS (MAG1) previously provided.

3 and 4 are related to a handover operation method according to an embodiment of the present invention, and FIG. 3 is a system configuration diagram, and FIG. 4 is a diagram illustrating a handover operation method.

Referring to FIG. 3, the configuration and system of the present invention will be described as follows. The MIH according to the present invention is in charge of a practical bridging role between the L2 (Layer2) and L3 (Layer3) layers in order to solve the traffic load problem that occurs due to the explosive increase in data traffic usage and to ensure QoS (Quality of Service). . Herein, in the present invention, information exchange with an information server (IS) may be performed in order to support continuity of a session through an interaction between an upper layer and a lower layer. Accordingly, the MIH is a media-dependent lower layer (IEEE 802.11, IEEE 802.3 (CSMA/CD), IEEE 802.16 (WiMAX), 3GPP) and a media-independent upper layer (IP, Mobile IP) when requesting handover between heterogeneous networks. , SIP, HIP) to provide an interactive interface between SAP (Service Access Points) and three MIHF (Media Independent Handover Function) services. In this case, the services basically provided by the MIHF include an event service, a command service, and an information service, and the service may play a role of managing and controlling a sub-interface state. Through this, it is possible to provide an interaction service between devices necessary for determining a handover target to support various standard technologies provided by IEEE 802 and an optimized handover in a cellular network.

In addition, the present invention provides a mobile terminal, a service network (PMAG) that provides network services before handover to the mobile terminal, and a selected candidate network (NMAG1) that provides network services after handover. New Mobile Access Gateway 1), can be classified into candidate networks (NMAG1, NMAG2, NMAG3, ..., NMAGn) adjacent to the mobile terminal in a handover process including the selected candidate network. In addition, the selected candidate network is used in parallel with the target network for a more clear description. In addition, the present invention introduces AMAP (Advanced Mobility Anchor Point), which is a hierarchical regional mobility management, to Fast Handover Extension for PMIPv6 (FHPMIPv6), and thus an Authentication Authorization Accounting (AAA) server, a Local Mobility Anchor (LMA) server, and Media Independent Information (MII). ) In addition to the server, the AMAP may be further included.

Referring to FIG. 4, a procedure for performing an ACLMIH-FHPMIPv6 transmission mechanism capable of supporting an optimized MIH service between heterogeneous networks in a Fast Handovers for Proxy Mobile IPv6 (FPMIPv6) integrated network will be described as follows.

First, in the present invention, when the mobile terminal (MN) detects the need for handover, the mobile terminal (MN) requests information on the available adjacent network from the currently connected service network (PMAG) through a media independent handover function (MIHF), To this end, the service network includes an information verification step of sending and receiving a [MIH_Get_Information Request/Response] message with the MII server.

In the present invention, after the information checking step, the service network includes an information providing step of transmitting a [MIH_Net_HO_Candidate_Query Request] message including handover trigger information to the mobile terminal. At this time, in the information providing step, whether to perform handover or whether to initiate handover through a list of heterogeneous networks is determined, which may be transmitted to the LTE-POS of the service network through a [MIH_Net_HO_Candidate_Query Response] message.

Thereafter, the present invention may include an availability check step of sending and receiving a [MIH_N2N_HO_Query_Resource Request / Response] message with several candidate networks in order to check whether the service network has availability of a network resource and to determine a handover target. Here, the service network may determine a handover target through a [MIN_N2N_HO_Query_Resource Response] message. In addition, [MIH_N2N_HO_Commit Request / Response] messages are exchanged with each other for a resource provision request from the determined or selected candidate network (NMAG1), and the corresponding result can be transmitted to the mobile terminal.

In this case, the present invention transmits and receives HI (Handover Initiate) and HACK (Handover Ack.) messages between the service network and the candidate network (NMAG1) for future service in order to reduce waste of radio link resources prior to transmission to the mobile terminal. It may include a resource preparation step. Here, the HI and HACK messages may include Mobile Node Identifier (MN-ID), Host Negotiation Protocol (HNP), Link Layer Identifier (LL-ID), Media Independent Handover Function Identifier (MIHF-ID), and the like. Herein, the present invention may introduce the advanced mobility anchor point (AMAP), which is a hierarchical regional mobility management, into the FHPMIPv6 network in order to efficiently control the occurrence of an increase in network load due to frequent handover requests in heterogeneous networks. This is an essential element in designing an intelligent network structure through network context awareness, and by performing the location registration procedure before the formation of a two-way tunnel, it is helpful to reduce the waste of radio link resources in the overlapped area and to maintain the binding update list. do.

In addition, after the resource preparation step, the present invention may further include a Local Blinding Update step in which the service network communicates with an Advanced Mobility Anchor Point (AMAP) to update the binding of the mobile terminal. In the present invention, after a two-way tunnel is formed, the service network (PMAG) notifies the LMA server of the location change, the service network (PMAG) and the LMA server FPBU (Fast Proxy Binding Update) and FPBAck (Fast Proxy Binding Acknowledgement) may include a location update step in which messages are exchanged with each other. Here, after checking whether it matches the BCE (Binding Cache Entry) information, if it does not match, the corresponding information is updated.

In addition, when the above procedure is completed, the present invention provides a Reverse Binding Mechanism, that is, a candidate network (NMAG1) that the LMA server will serve in the future to proceed with the routing path optimization work, Reverse Proxy Binding Update (RPBU), and Reverse Proxy Binding Update (RPBACK). Proxy Binding Acknowledgement) may include a path optimization step for sending and receiving messages. Here, the result may be delivered to the mobile node (MN) through a router advertisement (RA) message. Therefore, the hierarchical location registration procedure for tunneling setup and regional mobility management that proceeds after the handover target is determined not only reduces packet loss that occurs when handover requests are made, especially in case of movement within an overlapped area, but also enables efficient load balancing management. . In this case, if the procedure is performed preferentially, a problem of packet order reversal may occur. Therefore, packet order control can be configured through organic and systematic buffer management according to the management area.

In addition, the present invention may further include a step of performing a handover in which the mobile terminal receives a packet through the selected candidate network NMAG1. In the present invention, before the handover performing step, when a packet is transmitted from a Correspondent Node, a buffering operation of the packet is performed in a Local Mobility Anchor (LMA) server and an Advanced Mobility Anchor Point (AMAP), and the service network A first buffer management step received at the terminal; And a second buffer management step of performing a packet buffering operation in the service network and transmitting the packet to the selected candidate network, wherein the selected candidate network transfers the received packet to the mobile terminal. In the present invention, after the handover performing step or the handover performing step, when a packet is transmitted from a corresponding node, through a Local Mobility Anchor (LMA), an Advanced Mobility Anchor Point (AMAP), and a selected candidate network. It may be transmitted to the mobile terminal.

FIG. 5 relates to a handover operation method according to another embodiment of the present invention, and FIG. 5 shows a diagram of a system configuration diagram.

Referring to FIG. 5, the present invention may include an information collection step in which a service network collects AP (Access Point) information around a mobile node (MN) using an Inter Access Point Protocol (IAPP). .

In addition, after the information collecting step, when the need for handover of the mobile terminal is detected, the present invention may include an information providing step of providing the AP information collected by the service network to the mobile terminal. Next, the present invention may include a network selection step of selecting one AP from among APs collected from the mobile terminal or service network and communicating with a target network including the AP.

In addition, the present invention may include a resource preparation step in which the service network and the target network send and receive HI (Handover Initiate) and HACK (Handover Ack.) messages to reduce waste of radio link resources. Here, the HI and HACK messages may include Mobile Node Identifier (MN-ID), Host Negotiation Protocol (HNP), Link Layer Identifier (LL-ID), Media Independent Handover Function Identifier (MIHF-ID), and the like. Herein, the present invention may introduce the advanced mobility anchor point (AMAP), which is a hierarchical regional mobility management, into the FHPMIPv6 network in order to efficiently control the occurrence of an increase in network load due to frequent handover requests in heterogeneous networks. This is an essential element in designing an intelligent network structure through network context awareness, and by performing the location registration procedure before the formation of a two-way tunnel, it is helpful to reduce the waste of radio link resources in the overlapped area and to maintain the binding update list. do.

In addition, after the resource preparation step, the present invention may further include a Local Blinding Update step in which the service network communicates with an Advanced Mobility Anchor Point (AMAP) to update the binding of the mobile terminal. In the present invention, after a two-way tunnel is formed, the service network (PMAG) notifies the LMA server of the location change, the service network (PMAG) and the LMA server FPBU (Fast Proxy Binding Update) and FPBAck (Fast Proxy Binding Acknowledgement) may include a location update step in which messages are exchanged with each other. Here, after checking whether it matches the BCE (Binding Cache Entry) information, if it does not match, the corresponding information is updated.

In addition, when the above procedure is completed, the present invention provides a Reverse Binding Mechanism, that is, a candidate network (NMAG1) that the LMA server will serve in the future to proceed with the routing path optimization work, Reverse Proxy Binding Update (RPBU), and Reverse Proxy Binding Update (RPBACK). Proxy Binding Acknowledgement) may include a path optimization step for sending and receiving messages. Here, the result may be delivered to the mobile node (MN) through a router advertisement (RA) message. Therefore, the hierarchical location registration procedure for tunneling setup and regional mobility management that proceeds after the handover target is determined not only reduces packet loss that occurs when handover requests are made, especially in case of movement within an overlapped area, but also enables efficient load balancing management. . In this case, if the procedure is performed preferentially, a problem of packet order reversal may occur. Therefore, packet order control can be configured through organic and systematic buffer management according to the management area.

In addition, the present invention may further include a step of performing a handover in which the mobile terminal receives a packet through the selected candidate network NMAG1. In the present invention, before the handover performing step, when a packet is transmitted from a Correspondent Node, a buffering operation of the packet is performed in a Local Mobility Anchor (LMA) server and an Advanced Mobility Anchor Point (AMAP), and the service network A first buffer management step received at the terminal; And a second buffer management step of performing a packet buffering operation in the service network and transmitting the packet to the selected candidate network, wherein the selected candidate network transfers the received packet to the mobile terminal. In the present invention, after the handover performing step or the handover performing step, when a packet is transmitted from a corresponding node, through a Local Mobility Anchor (LMA), an Advanced Mobility Anchor Point (AMAP), and a selected candidate network. It may be transmitted to the mobile terminal.

6 is a comparison diagram showing a handover delay time between the prior art and the present invention in order to show the effect of the handover operation method according to various embodiments of the present invention.

Referring to FIG. 6, in order to demonstrate the efficiency of a design technique for a context-aware optimal transmission technology for integrated management of various access networks, the present invention has been divided into intra-domain support and inter-domain support. , The delay between MN and CN is shorter than the sum of delays between MN-AMAP, AMAP-LMA, and LMA-CN, and the geographic locations of LMA and AMAP are assumed to be the same. In addition, when configuring the candidate network interface considering the packet retransmission rate, the problem arising from the lengthening of the router queue was analyzed. As a result of the comparative analysis, compared with the existing protocols when handover between heterogeneous networks, the handover delay time was reduced by not performing a separate procedure for optimizing the routing path. It is expected that it will be possible to provide flow mobility for the load balancing of multimedia data traffic based on context awareness.

As described above, in the present invention, specific matters such as specific components and the like have been described by the drawings of limited embodiments, but this is provided only to help a more general understanding of the present invention, and the present invention is limited to the above-described embodiment. It is not, and those of ordinary skill in the field to which the present invention pertains can make various modifications and variations from this description.

Claims (7)

When the need for handover of a mobile terminal (MN: Mobile Node) is detected, a service network (PMAG: Previous Mobile Access Gateway) communicates with a Media Independent Information (MII) server, Information verification step of requesting information about Mobile Access Gateway);
An information providing step of providing information on the candidate network to a mobile terminal when the service network receives at least one candidate network from the MII server;
An availability check step of the service network communicating with the candidate network to check resource availability;
When one candidate network (NMAG 1) among at least one or more candidate networks (NMAG 1 to NMAG N) is determined, the service network communicates with the selected candidate network to transmit HI (Handover Intiate) information, and HACK (Handover Acknowledgement). ) Resource preparation step of receiving information; And
A handover performing step in which the mobile terminal receives a packet through the selected candidate network;
Handover operation method comprising a.
The method of claim 1,
After the resource preparation step,
A local blinding update step in which the service network communicates with an advanced mobility anchor point (AMAP) to update the binding of the mobile terminal;
Handover operating method comprising a further.
The method of claim 2,
After the local binding update step,
A location update step of updating binding cache entry (BCE) information by transmitting and receiving information between the service network and a local mobility anchor (LMA) server; And
After the location update step, a path optimization step in which the LMA server and the selected candidate network transmit and receive information for a routing path optimization operation;
Handover operating method comprising a further.
The method of claim 3,
In the location update step,
The service network and the LMA server transmit and receive each other FPBU (Fast Proxy Binding Update) and FPBAck (Fast Proxy Binding Acknowledgement) messages,
In the path optimization step,
The handover operation method, characterized in that the LMA server and the selected candidate network transmit and receive a Reverse Proxy Binding Update (RPBU) and Reverse Proxy Binding Acknowledgement (RPBA) message to and from each other.
The method according to claim 3 or 4,
In the path optimization step,
When the LMA server and the selected candidate network transmit and receive information,
The handover operation method, characterized in that the selected candidate network transmits a router advertisement (RA) message to the mobile terminal.
An information collection step in which the service network collects AP (Access Point) information around a mobile node (MN) using an IAPP (Inter Access Point Protocol);
An information providing step of providing the AP information collected by the service network to the mobile terminal when the need for handover of the mobile terminal is detected;
A network selection step of selecting one AP from among APs collected from the mobile terminal or service network, and communicating with a target network including the AP;
A resource preparation step in which the service network communicates with the target network to transmit HI (Handover Intiate) information and receive HACK (Handover Ack.) information; And
A handover performing step in which the mobile terminal receives a packet through the selected candidate network;
Handover operation method comprising a.
The method according to claim 1 or 6,
In the handover performing step,
When a packet is transmitted from the Correspondent Node,
A handover operation method, characterized in that it is delivered to the mobile terminal through a local mobility anchor (LMA), an advanced mobility anchor point (AMAP), and a selected candidate network.

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