WO2013025092A1

WO2013025092A1 - A system and method for mobile internet protocol handover

Info

Publication number: WO2013025092A1
Application number: PCT/MY2012/000187
Authority: WO
Inventors: Mohd Ariff Abdullah; Muhammad Faheem Mohd Ezani; Shariq Haseeb
Original assignee: Mimos Bhd.
Priority date: 2011-08-16
Filing date: 2012-06-29
Publication date: 2013-02-21
Also published as: MY179192A

Abstract

The present invention generally relates to a system and method for mobile internet protocol (IP) handover, more particularly the present invention relates to a system and method of virtual handover for multihomed mobile internet protocol (IP) roaming. The system of virtual handover for mobile IP roaming mainly comprises inventive modules of a mobility decision module (14) for triggering handover process between the networks, a bridge manager (15) for controlling and managing egress interfaces (13), a probe module (16) for relaying and querying information between modules of the system, and a network sniffer (17) for monitoring the egress interfaces (13).

Description

A SYSTEM AND METHOD FOR MOBILE INTERNET PROTOCOL

HANDOVER

TECHNICAL FIELD

The present invention generally relates to a system and method for mobile internet protocol (IP) handover, more particularly the present invention relates to a system and method of virtual handover for multihomed mobile internet protocol (IP) roaming.

BACKGROUND OF INVENTION

There are known conventional steps for a handover in mobile networks that follows "break existing connection", "break existing tunnel, "create new connection", "send binding update", and "create new tunnel". A tunnel can only accommodate one interface at each end, and Network Mobility (NEMO) needs Mobile Router-Home Agent (MR-HA) tunnel to work. In a multihoming environment, extra overhead is usually involved to destroy and re-create the MR-HA tunnel between different egress interfaces, thus resulting in a great deal of superfluous latency.

There are several prior arts divulged system and method for mobile internet protocol (IP) handover. US patent no. 7885248 (B2) discloses that a bridge can be established between call sessions and on to their final destinations once a match is determined that creates a shortcut for the packet traffic so that the packets are localized. However, the prior art divulged an invention where packet flows are bridged in a network to bypass backhaul call legs or tunnels when possible, the creation and implementation of the bridge in the prior art have been described for bypassing purposes. US patent no. 7333454 (B2) discloses methods of handing off or handover a mobile node from one router to another with four possible access speed of the networks, namely, the mobile terminal can roam from a fast-access network to another fast- access network, from a slow-access network to a fast-access network, from a fast- access network to a slow-access network, or from a slow-access network to another slow-access network. However, the prior art fails to address the problem of latency caused by destroying and re-creating tunnel between the Mobile Router and the Home Agent.

US patent no. 7869837 (B2) discloses a system and method for implementing a "lossless" transition from an idle state to an active or awake state in a mobile station. When a mobile station informs a serving base transceiver station that it is switching to an idle state, a virtual handover is executed, with the mobile station receiving a new Care of Address (Co A). The Co A is taken from an address space that is solely reserved for idle mobile station in a particular access network. The CoA is used to store data packets that are to be transmitted to the mobile station. Once the mobile station reenters an active state, the buffered packets can be forwarded to the mobile station without packet loss.

On the other hand, the present invention herein claims to supersede the prior arts above for addressing the problem of additional delay in the mobile network operation for every message exchanges within the network.

SUMMARY OF INVENTION

Typically, in order to complete a handover process between networks, there shall be a significant number of messages exchanges between the networks whereby every message exchange contributes to additional delay in the mobile network operation, thus affecting the propagation delay to consume more time. The object of the present invention is however to bring the messages exchanges across the networks into a single node, thus minimizing the messages exchanges between a Mobile Router and a Home Agent and thereby reducing the handover delay.

Preferably, the present invention provides a system for mobile internet protocol handover, wherein the system comprises symptomatic modules of a mobility decision module for triggering handover process between the networks, a bridge manager for controlling and managing egress interfaces, a probe module for querying and relaying information between modules of the system, and a network sniffer for monitoring the egress interfaces. Preferably, the present invention provides a system for mobile internet protocol handover, wherein the system comprises symptomatic configurations of a mobility module for performing mobile internet protocol, and a bridge for providing connection to backhaul networks usually present in the existing systems of mobile internet protocol but configured in such a way to accommodate the modules introduced in the present invention.

Preferably, the present invention provides a method for mobile internet protocol handover relevant to the system for mobile internet protocol handover as introduced in a preferred embodiment in the present invention hereafter.

The present invention herein aspires to diminish the propagation delay where it occurs in the communication nodes across engaging networks, and effectively introducing a mechanism that adopts a faster communication course between processes inside a node under a single bridge, and consecutively significantly shortening the overall delay during the mobile internet protocol handover.

Instead of having to destroy and re-create a layer 3 (network layer) tunnel across networks, the present invention introduces a method to bridge interfaces so that the Mobile Router can perform expedited handover by removing and adding an interface into a layer 2 (data link layer) inside the layer 2.

Essentially, the present invention uses a bridge interface as the egress interface. It is therefore that the bridge will remain as the sole egress interface during the entire mobile network operation. In other words, the invention herein does not change the fact that only one interface is tunneled to the Home Agent. Moreover, by using a bridge instead of a physical interface, multiple egress interfaces under the bridge can be virtually created. BRIEF DESCRIPTION OF DRAWINGS

Figure 1 illustrates the system architecture of mobile internet protocol handover as preferred in the present invention.

Figure 2 illustrates the representation of the bridge interface switching during mobile internet protocol roaming as preferred in the present invention.

Figure 3 illustrates the process flow for forwarding routing update messages as preferred in the present invention.

Figure 4 illustrates the process flow for the operation of routing update messages as preferred in the present invention. Figure 5 illustrates the schematic representation of the existing mobile internet protocol handover operation.

Figure 6 illustrates the schematic representation of the mobile internet protocol handover operation as preferred in the present invention.

Figure 7 illustrates the message sequence diagram comparing the time taken to complete the handover process between the existing handover operation and the operation as described in the present invention. Figure 8 illustrates the process flowchart for the mobile internet protocol handover operation as preferred in the present invention.

DETAILED DESCRIPTION OF EMBODIMENTS

Described below are preferred embodiments of the present invention with reference to the accompanying drawings. Each of the following preferred embodiments describes an example not limiting in any aspect. Referring to Figure 1 to Figure 8, the figures illustrate and corroborate the description of the system architecture of mobile internet protocol (IP) handover in the present invention for carrying out handover process between networks when a mobile device roams from one network to another typically involving a Home Network, Mobile Node, Foreign Networks, and Correspondent Nodes.

Mobile internet IP is an Internet Engineering Task Force (IETF) standard communications protocol that is designed to allow mobile device users to move from one network to another while maintaining a permanent IP address. In the related field of technology, there are several terminology usages that are frequently used within the scope of the present invention and are defined as follows throughout the entire description from Figure 1 to Figure 8.

"Mobile Network" is an entire network, moving as a unit, which dynamically changes its point of attachment to the internet.

"Mobile Node" is an IP node capable of changing its point of attachment to the network. "Care-of-Address" (CoA) is an IP address associated with the Mobile Node while visiting a foreign link.

"Home Network" is a network of a mobile device within which the device is assigned with an identifying IP address.

"Home Address" (HoA) is an IP address assigned to a Mobile Node, used as the permanent address of the Mobile Node. This address is within the Mobile Node's Home Network link. However, the present invention more profoundly adopts the terminology of "Mobile Address" (MoA) which is an IP address secondarily assigned to a Mobile Node, as an addition to the existing HoA but behaves like the HoA. "Home Agent" is a router on a Mobile Node's Home Network with which a mobile device has registered its CoA. While the Mobile Node is away from the Home Network, the Home Agent intercepts packets on the Home Network link destined to the Mobile Node's HoA or MoA, encapsulates them, and tunnels them to the Mobile Node's registered CoA.

"Foreign Network" is a network in which a Mobile Node is operating when the mobile device is away from its Home Network. "Foreign Agent" is a router that stores information about Mobile Node visiting Foreign Network. Foreign Agent also advertises CoA which is used during the mobile IP handover.

"Medium Access Protocol" (MAC) is a protocol for mediating access to, and possibly allocation of, the physical communications medium. Nodes participating in the medium access protocol can communicate only when they have uncontested access to the medium, so that there will be no interference. When the physical medium is a radio channel, the MAC is the same as the Channel Access Protocol. "Ingress interface" is the interface of a Mobile Router attached to a link inside the mobile network.

"Egress interface" is the interface of a Mobile Router attached to the home link if the Mobile Router is in the Home Network, or attached to a foreign link if the Mobile Router is in a Foreign Network.

"Mobile Router" is a router capable of changing its point of attachment to the network, moving from one link to another link. The Mobile Router is capable of forwarding packets between two or more interfaces, and possibly running a dynamic routing protocol modifying the state by which it does packet forwarding.

A Mobile Router acting as a gateway between an entire mobile network and the rest of the internet has one or more egress interfaces and one or more ingress interfaces. Packets forwarded upstream to the rest of the internet are transmitted through one of the Mobile Router's egress interface; packets forwarded downstream to the mobile network are transmitted through one of the Mobile Router's ingress interface. "Binding Update" (BU) is a message indicating a Mobile Node's current mobility binding, and in particular its CoA.

"Tunnel" is a path followed by a datagram while it is encapsulated. The model is that, while encapsulated, a datagram or packet data is routed to a knowledgeable agent, which decapsulates the datagram and then forwards it along to its ultimate destination.

Referring to Figure 1 , the preferred embodiment of the handover system in the present invention principally comprises a mobility module (11) for performing mobile internet protocol (IP), a bridge (12) connected to the mobility module (11) and associated with at least two egress interfaces (13) for providing connection to networks, a mobility decision module (14) connected to said mobility module (1 1) for triggering handover process between engaged networks, and a bridge manager (15) connected to the mobility decision module (14) for controlling and managing the egress interfaces (13).

The system is further managed by a probe module (16) connected to said mobility decision module (14) for querying and relaying information between modules of the system, a network sniffer (17) connected to the mobility decision module (14) and the probe module (16) for monitoring the egress interfaces (13), an address mapping module (18) for mapping relationships between CoA and Mo A of an involved Mobile Node roaming into a new network, and, a means for sending route update messages to the engaging Foreign Agents (52).

The system for mobile IP handover further comprises at least an ingress (51) connected to the mobility module (11) for receiving incoming packet data from a Home Network of which a mobile device is assigned to that resides in the Mobile Node of the embodiment as preferred in the present invention. The mobility decision module (14), bridge manager (15), probe module (16) and the network sniffer (17) as introduced, exchanges data information with each other to efficiently substantiate the operational mechanism for mobile IP handover between the networks where a mobile device roams within the Mobile Node as preferred in the present invention. There are several known delays during mobile IP handover, namely, ordered by speed are serialization delay, processing delay, queuing delay and the propagation delay, being the most time consuming.

The essence of the present invention where the data information exchanges that occur between network of a Mobile Node of the mobile device for multiple gateways multihoming also known as vertical handover in the technology to bring the connections into a single node as to minimize the message exchanges between a Mobile Router and the Home Agent, is greatly influenced by a bridge interface (41) and a non-forwarding interface, in association with the bridge (12) and the egress interfaces (13). The non-forwarding interface serves as the slave interface of the bridge (12) for providing a non-forwarding path scheme for the mobile protocol.

In the non-forwarding path scheme, as the path setup message travels from a Mobile Node of the mobile device of a new network to a previous network when the mobile device is roaming, data packets are diverted at a cross-over router to the new network, resulting in no forwarding of data packets from the previous network so as to eliminate unnecessary occurring latency for the travelling data packets should the mobile device roam to a new Foreign Network, thus reducing the handover delay. The bridge interface (41) as introduced earlier is configured to be an outgoing interface by the mobility module (1 1).

In other words, the preferred embodiment of the present invention aims to mend the propagation delay, which is the communication processes between nodes across networks, and to provide significant acceleration to the processes, which is the communication processes inside a node, thus significantly reducing the delay.

For routing data packets from the Home Agent to the CoA as the Mobile Node roams, a reciprocal tunnel will be set up for tunnelling the data packets and effectively maintaining the appearance that it is always on its Home Network. A tunnel can only accommodate one interface at each end, and Network Mobility requires a Mobile Router-Home Agent (MR-HA) tunnel to work. What is more in a multhoming environment is that in order to destroy and re-create the MR-HA tunnel between different egress interfaces during mobile IP roaming, extra overhead are ought to be anticipated.

The present invention teaches that a bridge interface (41) is used within the preferred embodiment with the egress interface (13), and the bridge (12) will remain as the sole egress interface (13) during the entire mobile IP network roaming operation. In other words, this invention does not change the fact that only one interface is tunneled to the Home Agent.

However, by using a bridge (12) instead of a physical interface, the present invention virtually creates multiple egress interfaces (13) under the bridge (12). The solution proposed by the present invention herein is to bridge interfaces so that instead of having to destroy and re-create the layer 3 (network layer) tunnel across networks, the Mobile Router can perform faster handover by removing and adding an interface into a layer 2 (data link layer) bridge (12) inside the layer itself.

Since the interfaces under a bridge (12) however cannot hold an IP address on their own but retains their Medium Access Protocol (MAC) address, the present invention suggests to tunnel from the address of the bridge (12) instead. Sequentially, in order to retain the tunnel while the bridge (12) or the Mobile Router is roaming, the present invention introduces a route update module (62) as shown in Figure 3 to advertise routing update messages to the foreign routers of the Foreign Agents (52) in the Foreign Networks.

The basic mechanism that is adopted in the teachings of the present invention as to accomplish the operation of the system for mobile IP handover is described as the responsibilities of the components of the present invention as follows. The ingress interfaces (51) receive incoming data information for transmitting the data information to the mobility module (11). The mobility decision module (14) receives data information from the probe module (16), and instructs the mobility module (11), the bridge manager (15), and the probe module ( 16). The bridge manager (15) queries and receives data information from the probe module (16), and sends control commands to the bridge (12). The probe module (16) queries and receives data information from the network sniffer (17). The network sniffer (17) queries and receives data information from the egress interfaces (13), and receives instructions from the mobility decision module (14), whilst the address mapping module (18) receives data information from the egress interfaces (13) for mapping between CoA and MoA.

The present invention further introduces the router updater part, involving the means for sending route update messages to Foreign Agents (52), preferably a border gateway protocol (19), queries and receives data information from the address mapping module (18), and instructs the Foreign Agents (52). The egress interfaces (13) preferably queries and receives data information from the Foreign Agents (52).

Referring to Figure 2, there is illustrated the switching of the bridge interface (41) during mobile IP network roaming as preferred in the present invention. The figure shows a bridge (12) in connections with preferably but not limited to three ingress interfaces (51), and in a connectivity relationship with at least two egress interfaces (13) through the bridge interfaces (41). It will be apparent to any skilled person in the art that a non-forwarding interface can be slaved to the bridge (12) for providing a non-forwarding path scheme, such that the configuration of the non-forwarding interface is not limited to the example of the present invention. The preferred embodiment of the present invention, shows how the bridge interface (41) associates the bridge (12) with the egress interfaces (13), whereby when a mobile device previously connected to a network involving the top egress interface (13) is shown to switch to the succeeding egress interface (13) when the mobile device moves to another network. Essentially, the preferred embodiment of the present invention comprises a bridge (12) that brings the connectivity among networks into a single node, and it is therefore that the bridge (12) behaves as an intermediate between the ingress interfaces (51) and the egress interfaces (13) with the bridge interface (41) and a non-forwarding interface slaved to the bridge (12).

Referring to Figure 1 to Figure 3, Figure 3 illustrates the process flow for forwarding routing update messages via a route update module (62), which is the means for sending route update messages to the engaging Foreign Agents (52) as described earlier to Foreign Networks as preferred in the present invention involving a Home Agent (64).

The figure depicts an egress bridge (65) ultimately the connection between the bridge (12), non-forwarding interface, bridge interface (41), and the egress interfaces (13) in an operational relationship with a Mobile Router (66) for forwarding route update messages to foreign routers (61 ) of a Foreign Agent (52) in a Foreign Network. The foreign routers (61) are then connected to an internet (73) whereby the internet (73), a global system of interconnected computer networks accesses a Home Agent (64) in a Home Network.

The route update message contains information of the CoA of the mobile device that roamed into that particular Foreign Network to solicit the presence of the mobile device in said network and update Foreign Agents (52) with the CoA of said mobile device. The foreign routers (61) will then access the internet (73) to communicate with the Home Agent (64) and to notify the current location of the mobile device, and map between the CoA and MoA as to permit the mobile device to roam in the new Foreign Network upon registration.

Referring now to Figure 1 to Figure 4, there is illustrated the process flow for routing update messages operation when a mobile device roams into another network as preferred in the present invention. Initially, the process flow for the operation of routing update messages begins with the foreign routers (61 ) advertising their local network IP address. Then, the Mobile Router (66) of the mobile device will swap their bridge slave interface for an active egress interface (13) to provide connection between the Home Agent (64) and the Mobile Node.

Thirdly, the Mobile Router (66) will receive route advertisements from the foreign routers (61) and will send route update messages through the route update module (62) to the foreign routers (61 ) during the handover process. Then, the foreign routers (61) of a Foreign Agent (52) at a Foreign Network the mobile device resides in, receive the route update messages, after which, the foreign routers (61) updates its tables and forwards the route update to a Home Agent (64) of the Mobile Node of the mobile device for mapping between the CoA and MoA, and finally registers the mobile device.

Referring now to Figure 1 and 6, Figure 5 and Figure 6 illustrate the schematic representation of the existing mobile IP handover operation in the industry and the schematic representation of the mobile IP handover operation as preferred in the present invention, respectively.

The existing mobile IP handover operation or more profoundly known as the prior art, typically creates a tunnel between a Mobile Router (66) and the Home Agent (64) of the Mobile Node of a mobile device via internet (73), called the MR-HA tunnel described in Figure 1 for sharing packet data between the Home Agent (64) and the mobile device. When the mobile device roams into another network, the MR-HA tunnel, which connects the mobile device and the Home Agent (64) in the previous network, is virtually destroyed in order to succeed the re-creation of the MR-HA tunnel within the new Foreign Network. However, in the preferred embodiment of the present invention as shown in Figure 6, a tunnel will be created from the Home Agent (64) to the Mobile Router (66) via a bridge (12) and through the internet (73) that remains the sole egress interface (13), and thus preserving the tunnel whenever the egress interfaces (13) swap for allowing connectivity of the mobile device to roam in the new network, thereby maintaining the dynamically routable address, MoA.

Evidently enough, the handover process as illustrated in the prior art requires additional time and processes to destroy and re-create the tunnel, wherein the process incurs time delay to the handover process, thus slowing down the overall process.

The present invention is however different from the prior art and the tunnel implementation as adapted in the present invention does not require reconstruction of the tunnel. It is therefore that the present invention solves the problems of propagation delay during the mobile IP handover by introducing a bridge (12).

Referring now to Figure 1 to Figure 7, the Figure 7 illustrates the message sequence diagram comparing the time taken to complete the handover process between the existing handover operation or prior art involving an existing Mobile Router (81) and a Home Agent (64), and the handover operation of the present invention involving the present Mobile Router (83) and a Home Agent (64) as preferred in the present invention. As shown in the diagram, the existing Mobile Router (81) of the existing handover operation of a mobile device was initially communicating with the Home Agent (82) in a tunnel binding with the first egress interface (13). When the mobile device roams into a Foreign Network, the existing Mobile Router (81) loses the egress interface (13) connection and informs the Home Agent (64) to destroy the tunnel.

The Home Agent (64) then destroys the tunnel and informs the existing Mobile Router (81 ) that the tunnel has been destroyed, whereby the existing Mobile Router (81) acknowledges and sends a Binding Update to the Home Agent (64) for a new CoA. The Home Agent (64) receives and confirms the Binding Update, and subsequently, the existing Mobile Router (81) then requests for a new tunnel where the Home Agent (64) creates a new MR-HA tunnel. Nevertheless, the mobile IP handover process in the present invention accommodates rather a simplified process flow and all processes performed in the present Mobile Router (83). The present invention first describes the initial position of the mobile device of a Mobile Node connecting the present Mobile Router (83) and the Home Agent (64), and also describes a MR-HA tunnel being bound to a bridge (12).

When the mobile device roams into a Foreign Network, a first egress interface (13) of the present Mobile Router (83) loses connection, and assigns a second egress interface (13) to obtain a new CoA. The bridge (12) then removes the first egress interface (13) and adds the second egress interface (13) as the new connection. The present Mobile Router (83) then maps the CoA and the MoA of the mobile device, and sends route update message to the Foreign Network to register the mobile device in the new network. The diagram in Figure 7 hereby supports how the present invention is able to minimize the propagation delay using straightforward communication processes with the Home Agent (64) as compared to the existing handover process or prior art, whereby the time taken for the prior art to complete its process is rather longer compared to the present invention.

Referring now to Figure 1 to Figure 8, Figure 8 illustrates the process flowchart for the mobile IP handover operation as preferred in the present invention.

The flowchart process of the mobile IP handover describes a program that begins with creating a bridge from the Mobile Router (66) to the Home Agent (64), and adding virtual egress interfaces (13) under the bridge (12).

Then the gateway interfaces are brought up while the program of the system defines "n=0", indicating a first egress interface (13) for the operation of the mobile IP handover. The system then checks if the first egress interface (13) is active and defines the previous interface from the previous network to be the current interface of the new network, and selecting the current interface as the active egress interface (13). Ensuing that, the program deletes the previous interface from the bridge (12) and adds the current interface of the active egress interface (13) under the bridge (12). The system then obtains the current CoA and matches the CoA with a new address. Then, for a CoA matching the new address, the system will map the CoA to the MoA of the mobile device, and transmit route update messages to the Home Agent (64). For a CoA not matching the new address, the system will check if the current interface is inactive. The system finally and frequently checks if whether or not the current interface is active.

If the current interface is inactive, the system will check if the previous interface is active. For an active previous interface, the system will swap the current interface with the previous interface, thereby continuing the process after setting the swapped interface as the current interface.

If the previous interface is inactive, the system will add the succeeding number sequence of the egress interface (13) in the program and define "n=l", which means the second egress interface (13) is now selected and the process is repeated from beginning where when the "n" was 0.

During the system checking for an active egress interface (13),, if the interface is inactive, the system will add 1 to the "n" until the maximum number of the available interfaces is reached. If the number of interfaces does not max out, the system will continue the routine for obtaining and active egress interface (13). Once the number of egress interfaces (13) reaches the maximum available number, the system will then scan the entire system and retry all the connections.

Concisely, the method for mobile IP handover as preferred in the present invention comprises the steps of initially creating a bridge interface (41) while maintaining a MoA. A virtual interface is then added under a bridge (12), and the system is configured to provide the bridge (12) to a mobile network of a mobile device through an egress interface (13). The system then checks the egress interface (13) after bringing up gateway egress interfaces (13). Once the egress interface (13) is checked, the system selects and checks each and every next egress interfaces (13) if each and every previous egress interfaces (13) is inactive.

The mobile IP handover system will select and check the first active egress interface (13) if all egress interfaces (13) are inactive, and adding the first active egress interface (13) under the bridge (12). A route update message will be sent to the new link connecting active egress interface (13) to the external network, after the system maps the CoA of mobile device, and the system will probe connectivity of the egress interface (13) slave.

The system constantly probes the connectivity of the previous egress interfaces (13) for an inactive present egress interface (13), and selects the next active egress interface (13) if the previous egress interface (13) is inactive. The program of the present invention is designed to repeat checking the egress interfaces (13), and swaps the disconnected egress interface (13) slave with an active egress interface (13).

In as much as the present invention is subject to many variations, modifications and changes in detail, it is intended that all matter contained in the foregoing description or shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense.

Claims

1. A system for mobile internet protocol handover comprises:

a mobility module (1 1) for performing mobile internet protocol;

a bridge (12) associated with at least two egress interfaces (13), connected to the mobility module (1 1) for providing connection to networks; a mobility decision module (14) connected to said mobility module

(11) for triggering handover process between engaged networks;

a bridge manager (15) connected to the mobility decision module (14) for controlling and managing the egress interfaces (13);

a probe module (16) connected to said mobility decision module (14) for querying and relaying information between modules of the system;

a network sniffer (17) connected to the mobility decision module (14) and the probe module (16) for monitoring the egress interfaces (13);

an address mapping module (18) for mapping relationships between care-of-address and mobile address of a mobile node; and

a means for sending route update messages to foreign agents (52), queries the address mapping module (18) and receives data information from the address mapping module (18) ;

characterised in that the bridge (12) comprises a bridge interface (41) and a non-forwarding interface slaved to the bridge (12), wherein the bridge

(12) , the bridge interface (41), the non-forwarding interface and at least an egress interface (13) are connected to each other, such that the bridge interface (41) bridges said non- forwarding interface with an active egress interface (13).

2. A system for mobile internet protocol handover in accordance to claim 1, wherein said mobility decision module (14), bridge manager (15), probe module (16) and the network sniffer (17) exchanges data information with each other.

3. A system for mobile internet protocol handover in accordance to claim 1, wherein the mobility module (11) is connected to at least an ingress interface (51) for receiving incoming data from the mobility decision module (14).

A system for mobile internet protocol handover in accordance to any of the preceding claims, wherein said mobility module (1 1) configures the bridge interface (41) as an outgoing interface.

A system for mobile internet protocol handover in accordance to any of the preceding claims, wherein said non-forwarding interface provides a non- forwarding scheme path for the mobile internet protocol.

A system for mobile internet protocol handover in accordance to claim 1, wherein the mobility decision module (14) receives data information from the probe module (16).

A system for mobile internet protocol handover in accordance to claim 1, wherein the bridge manager (15) receives instructions from the mobility decision module (14), queries the probe module (16) for data information, receives data information from the probe module (16), controls the bridge (12) or a combination thereof.

8. A system for mobile internet protocol handover in accordance to claim 1, wherein the probe module (16) receives instructions from the mobility decision module (14), queries the network sniffer (17) for data information, receives data information from the network sniffer (17), or a combination thereof.

9. A system for mobile internet protocol handover in accordance to claim 1, wherein the network sniffer (17) receives instructions from the mobility decision module (14), queries the egress interfaces (13) for data information, receives data information from the egress interfaces (13), or a combination thereof.

10. A system for mobile internet protocol handover in accordance to claim 1, wherein the means for sending route update messages to foreign agents (52) is preferably a border gateway protocol (19) that instructs foreign agents (52).

1 1. A system for mobile internet protocol handover in accordance to claim 1 , wherein the foreign agents (52) are preferably foreign routers (61).

12. A system for mobile internet protocol handover in accordance to claim 1 , wherein the egress interfaces (13) preferably transmits data information to the address mapping module (18), queries the foreign agents (52), receives information from the foreign agents (52), or a combination thereof.

13. A system for mobile internet protocol handover in accordance to claim 1, wherein said mobile address is a dynamically routable address.

14. A system for mobile internet protocol handover in accordance to claim 1, wherein said mobile address belongs to neither statically routed subnet.

15. A method for mobile internet protocol handover as described in claim 1 comprises the steps of:

creating a bridge interface (41);

maintaining a mobile address;

adding a virtual interface under a bridge (12);

configuring the system for providing the bridge to a mobile network through an egress interface (13);

bringing up gateway egress interfaces (13);

checking the egress interface (13);

selecting and checking each and every next egress interfaces (13) if each and every previous egress interfaces (13) is inactive;

selecting and checking the first active egress interface (13) if all egress interfaces (13) are inactive;

adding the first active egress interface (13) under the bridge (12); mapping a care of address with the mobile address;

sending a route update message to the new link connecting the active egress interface (13) to the external network;

probing connectivity of the egress interface (13) slave; probing the connectivity of the previous egress interfaces (13) for an inactive present egress interface (13);

selecting the next active egress interface (13) for the previous inactive egress interface, and repeat checking the egress interfaces (13); and

swapping the disconnected egress interface (13) slave with an active egress interface (13).