KR100938281B1 - Method for handover between heterogeneous networks using link trigger signal in multi-interface mobile node - Google Patents

Abstract

The present invention relates to a handover method between heterogeneous networks using a link trigger signal in a mobile node having multiple interfaces, wherein a fast mobile node (MN) having multiple interfaces uses a heterogeneous network (particularly, a link up / down trigger signal). By performing a handover between a wireless network and a satellite network), a packet loss and a session disconnection are prevented regardless of the moving speed of a high speed mobile node, and the terminal power consumption is significantly reduced.

To this end, the present invention provides a handover method between heterogeneous networks in a mobile node having multiple interfaces, wherein the mobile node located in the first network maintains a second network connection interface in a sleep state and a first network connection interface. A first network service receiving step of activating the first network service; A handover step of performing a handover by switching the second network access interface to an active state when the mobile node detects a second network linkup trigger signal as the mobile node moves to a second network side; And a second network service receiving step of receiving a second network service through the activated second network access interface by the mobile node which has performed the handover.

Mobile IP, Mobile Node, Handover, Wireless Network, Satellite Network, Link Trigger Signal

Description

Handover method between heterogeneous networks using link trigger signal in mobile nodes with multiple interfaces {METHOD FOR HANDOVER BETWEEN HETEROGENEOUS NETWORKS

The present invention relates to a handover method between heterogeneous networks using a link trigger signal in a mobile node having multiple interfaces. More particularly, a fast mobile node (MN) having multiple interfaces uses a link up / down trigger signal. By performing a handover between heterogeneous networks (especially wireless networks / satellite networks), a multi-interface can be provided that can prevent packet loss and session disconnection and can significantly reduce terminal power consumption regardless of the moving speed of a high speed mobile node. The present invention relates to a handover method between heterogeneous networks using a link trigger signal in a mobile node.

The present invention is derived from the research conducted as part of the IT growth engine technology development project of the Ministry of Information and Communication and the Ministry of Information and Telecommunications Research and Development. Development].

With the recent expansion of mobile services, the bandwidth of Internet services has increased, and as mobile subscribers move, mobile nodes (MNs) such as laptops move at high speeds. Skills needed.

In particular, in the case of a high speed mobile node moving at a speed of more than 300 km / h, such as a high-speed train, there is a demand for a technology capable of providing an inter-network handover that minimizes packet loss and delay while using an IPv4-based mobile IP technology. .

The related art is a handover technique in a homogeneous network such as a wireless LAN, which has an identical dual interface to a mobile node and uses an unused interface before disconnecting an IP path connected to the currently connected access router. By using a temporary IP address from an access router in a newly moving domain, a tunnel is established, and at the same time, an interface that is already in use is disconnected to change the IP path for packet transmission at high speed, resulting in packet loss or delay even at high speed. There is an effect of reducing the handover time while not doing so.

However, in the case of a moving object such as a high-speed train that runs at more than 300 km / h, the moving cell size is small, so it is necessary to pass through several cells frequently. At this time, it is difficult to detect mobility in advance and it is impossible to secure the minimum time required for inter-cell handover. In this case, there is a problem that packet loss cannot be avoided.

On the other hand, other conventional techniques related to Mobile IP (MIP) include pre-registration, post-registration, fast mobile IP technology, etc. for a mobile node having a single interface, all of which are fast handover and minimal packet. Although the loss is aimed at, a fast moving object such as a high-speed train has a problem of disconnection of a service session due to handover failure as well as packet loss.

In the prior art as described above, there is a problem that a session may be disconnected due to packet loss or handover failure in a high-speed mobile such as a high-speed train, and an object of the present invention is to solve such a problem.

The objects of the present invention are not limited to the above-mentioned objects, and other objects and advantages of the present invention which are not mentioned above can be understood by the following description, and will be more clearly understood by the embodiments of the present invention. Also, it will be readily appreciated that the objects and advantages of the present invention may be realized by the means and combinations thereof indicated in the claims.

In order to solve the above object, the present invention provides a fast mobile node (MN) having multiple interfaces to perform handover between heterogeneous networks (particularly, wireless / satellite networks) using a link up / down trigger signal. It features. In addition, the present invention is characterized in that after the handover is performed, the connection interface to the previous network is switched to the life state.

More specifically, the present invention provides a method for handover between heterogeneous networks in a mobile node having multiple interfaces, wherein the mobile node located in the first network maintains a second network connection interface in a sleep state and the first network. A first network service receiving step of activating a connection interface to receive a first network service; A handover step of performing a handover by switching the second network access interface to an active state when the mobile node detects a second network linkup trigger signal as the mobile node moves to a second network side; And a second network service receiving step in which the mobile node which has performed the handover is provided with a second network service through the activated second network access interface.

The present invention as described above, by controlling the handover between the radio network / satellite network by the sequential link up / down trigger signal in the mobile node (MN) having multiple interfaces, the packet regardless of the moving speed of the mobile node in the high-speed railway It is effective to prevent loss and disconnection of sessions.

That is, the present invention performs a handover from a terrestrial wireless network having a small cell size to a satellite network having a very large cell size based on a link trigger, so that even in a mobile node in a high-speed railway, there is no packet loss or session disconnection. There is an effect that can provide.

In addition, when the mobile node is equipped with a dual interface and performs a high-speed handover between the terrestrial wireless home network and the satellite landing network, the present invention provides another inactive service in a wireless network / satellite network service state except for a handover period. By switching the network interface to the sleep state, the power of the mobile node is significantly reduced.

That is, the present invention considers that a long time must pass after handover from the wireless network with the small cell size to the satellite network with the large cell size and then handover back to the wireless network which is the home network. While receiving a wireless network access interface that is not in use (sleep) state by sleeping (sleep) by preventing the packet loss while reducing the power consumption of the mobile node can be significantly reduced.

The present invention provides a unique IP address used in a home network when a mobile node having two interfaces connected to a wireless network and a satellite network moves from a wireless network, which is a home network, to a satellite network, which is a visited network. (Home Address) ', which is temporarily assigned from the visited network without changing the HoA (hereinafter referred to as' Care-of Address', which is referred to as CoA). Therefore, even if there is a movement of the mobile node, it is characterized in that it provides a wireless Internet service without packet loss or session loss. That is, the present invention relates to a soft handover control method using a multi-link trigger method.

The above objects, features and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, whereby those skilled in the art may easily implement the technical idea of the present invention. There will be. In addition, in describing the present invention, when it is determined that the detailed description of the known technology related to the present invention may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a configuration diagram of a wireless / satellite interworking network for a high-speed mobile Internet service to which the present invention is applied.

The wireless network 100 is a home network based on a wireless LAN or WiBro technology, and includes a home agent (HA) 101, a base station (BS) 102, and a mobile node (MN: Mobile). Node) 10 or the like. The wireless network 100 provides a high speed Internet service to the mobile node (MN) 10 without changing the IP even when moving based on the mobile IPv4 protocol.

Meanwhile, the satellite network 110 provides two-way Internet service using up / down link based on DVB-S2 / RCS, and includes a router (R) 112, a foreign agent 111, and a visit agent (FA) 111. Mobile node (MN) 10 or the like. Here, the router 112 is located in the centralized station of the satellite network 110, and the visited agent (FA) 111 is a router connected to the mobile node (MN) 10, and is generally located in a fixed terminal station on the ground. In the case of considering the Internet service for the high-speed mobile unit as in the present invention, it is located in the mobile terminal station 11 such as the high-speed railway. In addition, the router 112 and the visited agent (FA) 111 are connected by a bidirectional link via a satellite.

Meanwhile, the correspondent node (CN) 121 is a fixed node that exchanges data with the mobile node (MN) 10 over the IPv4 Internet protocol.

When the mobile node (MN) 10 in the home network 100 moves to the satellite network 110 as a visited network, a new IP address CoA is allocated based on the mobile IPv4 protocol and the home agent (HA) 101 is assigned. By forming a tunnel between the visiting agents (FAs) 111, even if the mobile node (MN) 10 moves between the manganeses, a seamless Internet service can be established with the counterpart node (CN) 121 without changing the fixed IP address HoA. Lasts.

This wireless / satellite network handover scenario is a case in which a mobile subscriber connected to the terrestrial wireless network 100 via the wireless LAN in the high-speed railway history is connected to the Internet 120 by boarding a train and changing an IP domain. A new connection is made to the access router, i.e., the visiting agent (FA) 111, and continues to maintain the Internet service with the counterpart node (CN) 121 via the satellite link.

When the train enters the destination history and the mobile subscriber gets off and arrives at the history, the scenario corresponds to a scenario in which the mobile node (MN) 10 returns to the home network 100 in FIG. The tunnel between the HA 101 and the visited agent (FA) 111 is released and continuously performs internet communication with the counterpart node (CN) 121 at the original static IP address HoA.

2 is a flowchart illustrating a handover processing method when a mobile node applied to the present invention moves to a visited network, wherein the mobile node (MN) 10 moves from the home network 100 to the visited network 110. It shows the mobile IPv4 processing procedure of the case.

First, in the home network 100 in which the mobile node (MN) 10 is a wireless network, the fixed home of the mobile node (MN) 10 via the access station (BS) 102 and the home agent (HA) 101. Assume that the packet 1 data is received from the counterpart node (CN) 121 using the HoA, which is an IP address, as the destination address (201).

When the mobile node (MN) 10 boards a train, it establishes a link through the layer 1/2 connection procedure with the visiting agent (FA) 111 to the newly-connected satellite network 110 and then the IP / MIP layer. This is done.

That is, the mobile node (MN) 10 transmits an Agent Solicitation message, which is a MIP layer signal, to the visiting agent (FA) 111 in order to perform a fast handover (202).

Then, after receiving the agent request message, the visiting agent (FA) moves the Agent Advertisement message containing CoA information, which is an IP address that the mobile node (MN) 10 temporarily uses in the visiting network 110. Transmit to node (MN) 10 (203).

The mobile node (MN) 10 then sends a Registration Request message to the Home Agent (HA) 101 via the Visit Agent (FA) 111 and the Router (R) 112 ( 204, 205). In response, the home agent (HA) 101 sends a registration reply message to the mobile node (MN) 10 in reverse order (206, 207).

Through the registration request and response process (204 to 207) as described above, a new tunnel is formed between the home agent (HA) 101 and the visited agent (FA) 111 via the router (R) 112. Packet 2 data transmission is performed between the counterpart node (CN) 121 and the mobile node (MN) 10 via the tunnel (208 to 210).

That is, when the mobile node (MN) 10 is in the home network 100, the packet transmitted from the counterpart node (CN) 121 is transmitted to the home agent (HA) 101 and the access station (BS) 102. Is transmitted to the mobile node (MN) 10 based on the HoA, which is a static IP address. However, after the mobile node (MN) 10 moves to the visited network 110, since the packet transmitted from the counterpart node (CN) 121 is routed through a tunnel using CoA, which is a new temporary IP address, Even if the domain is changed, it is unnecessary to change the HoA, which is the home IP address of the mobile node (MN) 10.

When handover occurs between domains, packets transmitted from the counterpart node (CN) 121 are lost during the movement detection, agent discovery, and registration procedures for the visited network. Therefore, a fast handover procedure is required. There are methods such as pre / post registration, regional registration, and fast mobile IP.

3 is a flowchart illustrating a method for handover operation of a home agent (HA) in a wireless / satellite interworking network according to the present invention. FIG. 3 illustrates a mobile IPv4 operation for a home agent (HA) 101 in a wireless / satellite network handover process. Indicates.

When the mobile node (MN) 10 moves to the visited network 110, it is already known that the home agent (HA) 101 will receive a Registration Request message from the mobile node (MN) 10. It has been described with reference to Fig. 2 (204, 205).

When the home agent (HA) 101 receives a packet from the outside, the home agent 101 confirms whether the received packet is a registration request message (301), and if the registration request message is a life time of the message is "0" (life time = 0). If it is not a registration message (ie, if the received packet is a data packet), a process of "307" to "309" is performed, which will be described later.

Check whether the life time of the received registration request message is "0" (life time = 0) (302), and if not "0", the HoA and CoA for the mobile node (MN) 10 are entered in the binding table. Register / update, establish a tunnel with the visiting agent (FA) 111, send a Registration Reply message to the mobile node (MN) 10 (303), and then wait for the next packet reception. Return to

In contrast, when the received registration request message has a life time of "0" (life time = 0), the following two operations are performed according to whether the CoA address and the HoA address are the same (304). If the CoA address and the HoA address are the same, it is a registration request message sent after the mobile node (MN) 10 returns to the home network. Therefore, the binding entry for all registered CoAs for the mobile node (MN) 10 is deleted. If the CoA address and the HoA address are different (304, 305), only entries related to the sent CoA address are deleted from the binding table (304, 306).

On the other hand, if the received packet is not a registration request message (301), since the data packet is received from the counterpart node (CN) 121, it is first checked whether the received packet is registered in the binding entry (307). .

As a result of the registration check, if the received packet is registered in the binding entry, after confirming that the destination IP address is the same as the HoA address, if it is the same, encapsulate the received packet to the corresponding CoA address and then visit the FA through the tunnel. Transmit to mobile node (MN) 10 via 111 (308). If the received packet is not registered in the binding table, the received packet is processed according to the existing IP layer protocol (309).

Meanwhile, in the radio / satellite network handover processing procedure to which the present invention is applied, the mobile IPv4 operation for the 'FA' 111 is the same as the basic function for the general router, and the mobile node (MN) 10 Since only the passive function of decapsulating the packet received through the tunnel and delivering it to the mobile node (MN) 10 by managing the visitor list for, the detailed description is omitted.

4 is a flowchart illustrating a method for operating a handover of a mobile node (MN) in a wireless / satellite interworking network according to the present invention. FIG. 4 illustrates a mobile IPv4 operation of a mobile node (MN) 10 in a wireless / satellite network handover process. Indicates.

When the mobile node (MN) 10 enters the visited network 110, it may send an Agent Solicitation message to the visiting agent (FA) 111 as an optional means to reduce the handover time, but basically Receive an Agent Advertisement (Agent Advertisement) message from the visited agent (FA) 111.

When the mobile node (MN) 10 receives a packet (401), the mobile node (MN) 10 checks whether the received packet is an Agent Advertisement message (402). It is determined whether or not the visitor 110 (403). As a result of the determination, if the mobile node (MN) 10 enters the home network 100, the mobile node returns to the packet reception standby state, and if it is determined that the mobile node (MN) 10 enters the visited network 110, the temporary IP address CoA Generate a Registration Request message and transmit it to the Home Agent (HA) 101 via the Visit Agent (FA) 111 and the Router (R) 112 (404).

On the other hand, if the packet received by the mobile node (MN) 10 is a 'Registration Response message' sent by the home agent (HA) 101 in response to the registration request message (402, 405), it is fixed. After maintaining the binding for the HoA address, which is an IP address, and setting the visiting agent (FA) 111 as the default router of the mobile node (MN) 10 (406), it returns to the packet reception waiting state.

On the other hand, if the packet received by the mobile node (MN) 10 is neither an agent advertisement message nor a registration response message (402, 405) and the destination address of the received packet is the same as the HoA address (407), Since the received packet is a data packet transmitted from the counterpart node (CN) 121 to the mobile node (MN) 10, the received packet is processed (408).

On the other hand, if the mobile node (MN) 10 does not receive a registration response message from the home agent (HA) 101 after transmitting a registration request message even after a predetermined timer elapses (401, 409), The registration request message is retransmitted to the home agent (HA) 101 (410).

5 is a state transition diagram of a mobile node MN using sequential link trigger signals of multiple interfaces according to the present invention.

The operating state of the mobile node (MN) 10 having multiple interfaces is a handover state for two service states 51 and 53 by the wireless network 100 and the satellite network 110 and a wireless / satellite network overlapping interval. The operation is divided into (52). Here, the satellite network 110 designates an area including all driving routes of the high speed train as the satellite network cell.

In the wireless home network service state 51, a mobile node (MN) 10 having two network connection interfaces is located in the terrestrial wireless network 100, which is a home network. (102) and the IP communication with the counterpart node (CN) 121 through the home agent (HA) (101). In this state, since the internet service through the satellite network is not performed, the satellite network interface remains in a sleep state inactive.

When the mobile node (MN) 10 enters the satellite network 110, the 'satellite network linkup trigger signal' 501 is notified to the mobile IP layer by layer 1/2 processing of the satellite network access interface in the sleeping state. With this signal, the mobile node (MN) 10 transitions to a radio / satellite network handover state 52. In this radio / satellite network handover state 52, the mobile node (MN) 10 communicates with the visiting agent (FA) 111 and the home agent (HA) 101 via the satellite network access interface according to FIG. 2. By performing the procedure, a packet is received through two wireless network access interfaces and a satellite network access interface. For example, in case of receiving 10 packets from a counterpart node (CN), 5 packets are received through the radio network interface before handover and the remaining 5 packets are received through the satellite network interface after handover. Is that. As a result, packet loss due to handover does not occur.

Then, when the mobile node (MN) 10 can no longer receive a radio signal from the wireless network 100, a 'wireless link down trigger signal' 502 is generated by layer 1/2 processing. By this signal, the mobile node (MN) 10 changes the radio access interface to a sleep state which is inactive and transitions to the satellite visited network service state 53.

In this satellite visited network service state 53, the mobile node (MN) 10 connects to the counterpart node (CN) via a tunnel between the visited agent (FA) 111 and the home agent (HA) 101 via the satellite network access interface. Communication with the 121 and the wireless network connection interface remain in a sleep state in which it is inactive, thereby saving power consumption of the mobile node (MN) 10.

Subsequently, when the mobile node (MN) 10 moves to the wireless home network 100 and returns to it, the wireless network linkup trigger signal 503 is processed by layer 1/2 processing of the wireless network access interface that is in the sleep state. Is notified to the mobile IP layer and by this signal the mobile node (MN) 10 transitions back to the radio / satellite network handover state 52.

In this radio / satellite network handover state 52, the mobile node (MN) 10 communicates with the access station (BS) 102 and the home agent (HA) 101 via the radio network access interface. Performs handover procedure of deregistration according to By doing so, the mobile node (MN) 10 can receive data through two network connection interfaces while moving the wireless / satellite network overlapping interval, thereby communicating with the counterpart node (CN) 121 without packet loss. Will continue.

Then, when the mobile node (MN) 10 can no longer receive satellite signals from the satellite network 110, the 'satellite network linkdown trigger signal' 504 is generated by layer 1/2 processing of the satellite network access interface. By this signal, the mobile node (MN) 10 changes the satellite network interface into a sleep state which is inactive and transitions to the wireless home network service state 51.

By performing the handover control according to the series of multi-link up / down trigger signals as described above, packet loss can be prevented regardless of the moving speed of the mobile node, and the other two except the wireless / satellite network handover state 52 can be used. In the service states 51 and 53, power consumption of the mobile node can be reduced by switching the inactive network access interface to the sleep state.

6 is a flowchart illustrating a method for controlling handover of a mobile node (MN) using sequential link trigger signals of multiple interfaces according to the present invention.

If a mobile node (MN) 10 having two network access interfaces is initially located in a terrestrial wireless network, which is a home network, it connects to the access station (BS) 102 with one wireless network access interface and the home agent. (HA) 101 performs IP communication with the counterpart node (CN) 121 (601), and the satellite network link-up trigger signal while maintaining an inactive sleep state because other satellite network access interfaces are not used. Continue to check (602).

Here, the satellite network link-up trigger signal is generated by the layer 1/2 processing of the satellite network access interface in the sleep state. Specifically, whether the satellite link up trigger signal exceeds a threshold for a beacon signal, a radio signal strength, and an S / N ratio In addition, if it is determined that the satellite link is up through a process of comparing the previously stored information with the GPS location information of the mobile node (MN) 10, a satellite network link up trigger signal is generated.

As a result of the inspection, when the satellite network link-up trigger signal is generated (602), the mobile node (MN) 10 transmits a visit agent (FA) 111 and a home agent (HA) 101 to the satellite visit network through the satellite network access interface. And handover procedure according to the MIP registration procedure according to FIG. 2 (603) and receive and process all packets transmitted through two radio network access interfaces and satellite network access interfaces (604). The mobile node (MN) 10 maintains this state until the radio network linkdown trigger signal is generated, so that no packet loss occurs even when the mobile node (MN) 10 moves to the wireless and satellite network overlapping intervals. It will not be.

Here, the wireless network linkdown trigger signal is generated by the layer 1/2 processing of the wireless network access interface. Specifically, the values of the beacon signal loss, the wireless signal strength, the S / N ratio, the data transmission change rate, etc. When it falls below the threshold, it is determined that the wireless network link is down and generates a wireless network link down trigger signal.

When a radio network linkdown trigger signal is generated (605), the mobile node (MN) 10 switches the radio network access interface to an inactive sleep state (606), and uses the satellite network access interface in advance. Packet transmission is continuously performed until the counterpart node (CN) 121 and the wireless network linkup trigger signal are generated through the tunnel between the visited agent (FA) 111 and the home agent (HA) 101 set at 603. (607). This may save power consumption of the mobile node (MN) 10.

Subsequently, when the mobile node (MN) 10 moves to the wireless home network, the wireless network linkup trigger signal is generated by layer 1/2 processing of the wireless network access interface in the sleep state. Specifically, the wireless network link is up (eg, whether or not to exceed a threshold for a beacon signal, radio signal strength, S / N ratio, etc., or a process of comparing previously stored information with GPS location information). If it is determined to be Up), it generates a wireless network link up trigger signal.

When a radio network linkup trigger signal is generated (608), the mobile node (MN) 10 is connected to the access station (BS) 102 and the home agent (HA) 101 via the radio network access interface to the wireless home network. 2 and 3, a handover procedure of deregistration according to FIGS. 2 and 3 is performed (609) to receive and process all packets transmitted through two radio network access interfaces and satellite network access interfaces (610). The mobile node (MN) 10 maintains this state until the satellite network linkdown trigger signal is generated (608), so that the mobile node (MN) 10 has no packet loss even when the mobile node moves to the wireless and satellite network overlapping intervals. 121) and communication can continue.

Here, the satellite network link down trigger signal is generated by layer 1/2 processing of the satellite network access interface. When the beacon signal loss, radio signal strength, S / N ratio, data transmission change rate, etc. falls below a threshold, the satellite network link is determined to be down and a satellite network link down trigger signal is generated.

On the other hand, when a satellite network linkdown trigger signal is generated (611), the mobile node (MN) 10 switches the satellite network interface into a sleep state in which it is inactive (612), Initial radio that continues to perform IP communication with the correspondent node (CN) 121 through the access station (BS) 102 and the home agent (HA) 101 where the handover procedure of deregistration has been performed in advance (609). Return to home network service provision state.

By performing the handover control between networks by the sequential link up / down trigger signal for the multiple network access interface as described above, packet loss can be prevented regardless of the moving speed of the mobile node (MN) 10. In the wireless network / satellite network service state, power consumption of the mobile node can be saved by switching the inactive network access interface to the sleep state.

On the other hand, the method of the present invention as described above can be written in a computer program. And the code and code segments constituting the program can be easily inferred by a computer programmer in the art. In addition, the written program is stored in a computer-readable recording medium (information storage medium), and read and executed by a computer to implement the method of the present invention. The recording medium may include any type of computer readable recording medium.

The present invention described above is capable of various substitutions, modifications, and changes without departing from the technical spirit of the present invention for those skilled in the art to which the present invention pertains. It is not limited by the drawings.

1 is a configuration diagram of a wireless / satellite interworking network for a high-speed mobile Internet service to which the present invention is applied;

2 is a flowchart illustrating a handover processing method when a mobile node applied to the present invention moves to a visited network;

3 is a flowchart illustrating a handover operation method of a home agent (HA) in a wireless / satellite interworking network applied to the present invention;

4 is a flowchart illustrating a handover operation method of a mobile node (MN) in a wireless / satellite interworking network according to the present invention;

5 is a state transition diagram of a mobile node MN using sequential link trigger signals of multiple interfaces according to the present invention;

6 is a flowchart illustrating a method for controlling handover of a mobile node (MN) using sequential link trigger signals of multiple interfaces according to the present invention.

* Explanation of symbols on the main parts of the drawings

10: mobile node (MN) 100: home network (wireless network)

101: home agent (HA) 102: connection station (BS)

110: visited network (satellite network) 111: visited agent (FA)

112: router 120: the Internet

121: partner node (CN)

Claims (11)

In the handover method between heterogeneous networks in a mobile node having multiple interfaces, The mobile node located in the first network maintains the second network access interface in the sleep state and maintains IP communication with the counterpart node using the IP address, thereby activating the first network access interface to provide the first network service. Receiving a first network service provided; When the mobile node detects the second network linkup trigger signal as the mobile node moves to the second network side, the second network connection interface is switched to an active state while maintaining the IP communication without changing the IP address. A handover step of performing an over; And Receiving a second network service in which the mobile node performing the handover is provided with a second network service through the activated second network access interface. Handover method between heterogeneous networks using a link trigger signal comprising a. The method of claim 1, The second network service receiving step, When the mobile node which performs the handover detects the first network linkdown trigger signal as the mobile node enters and moves to the second network, the link trigger signal may be switched to the sleep state. Handover Method between Heterogeneous Networks. The method according to claim 1 or 2, And wherein the first network is a wireless network, which is a home network, and the second network is a satellite network, which is a visited network. The method of claim 3, wherein The first network service receiving step, The mobile node accesses the access point BS of the wireless network through a wireless network access interface, and performs IP communication with the counterpart node CN through the home agent HA with a unique IP address HoA. A handover method between heterogeneous networks using a link trigger signal. The method of claim 4, wherein The handover step, When a satellite network linkup trigger signal is detected, a handover according to a mobile IP registration procedure is performed with a visit agent FA and the home agent HA through a satellite network access interface, and the temporary IP address CoA is used to perform the handover. A handover method between heterogeneous networks using a link trigger signal, characterized by maintaining IP communication with a counterpart node (CN). The method of claim 5, wherein The second network service receiving step, When the mobile node detects a radio network linkdown trigger signal, it maintains IP communication with the counterpart node CN through a tunnel between the visited agent FA and the home agent HA through the satellite network access interface. A handover method between heterogeneous networks using a link trigger signal. The method according to claim 1 or 2, And wherein the first network is a satellite network, which is a visited network, and the second network is a wireless network, which is a home network. The method of claim 7, wherein The handover step, When the mobile node detects a wireless network linkup trigger signal as the mobile node moves to the wireless network, the mobile node performs a mobile IP deregistration procedure with the access station (BS) and the home agent (HA) through a wireless network access interface. A handover method between heterogeneous networks using a link trigger signal. The method of claim 8, The second network service receiving step, When the mobile node detects the satellite network link down trigger signal, the partner node CN through the access station BS and the home agent HA whose mobile IP deregistration procedure is released using the radio network access interface. Handover method between heterogeneous networks using a link trigger signal, characterized in that for performing IP communication. The method of claim 1, The second network link up trigger signal is The second network connection interface in the sleep state is determined whether the link up state using any one of the beacon (beacon) signal, radio signal strength, signal to noise ratio (S / N), or the GPS location information of the mobile node. And handing over a heterogeneous network using a link trigger signal, characterized in that according to the determination result. The method of claim 2, The first network link down trigger signal, The first network connection interface in an active state determines whether the link is down by using one of a beacon signal, a wireless signal strength, a signal-to-noise ratio (S / N), or a data transmission change rate. Handover between heterogeneous networks using a link trigger signal, characterized in that for generating according to.

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