KR100605611B1 - Routing optimization method for IP network mobility in MPLS network - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

The present invention relates to a path optimization method for IP mobility service in MPS network.

2. The technical problem to be solved by the invention

According to the present invention, in order to more efficiently provide mobility of a mobile network, when the mobile router receives the moving information from the edge router of the MPLS network and transfers the information to another necessary edge router to inform the mobile location of the mobile network, data is transmitted through an appropriate LSP preset between the edge routers. Thus, the purpose is to provide a path optimization method that can optimize the path.

3. Summary of Solution to Invention

The present invention, in the path optimization method for the mobility service of the IP (IP) network in the MPLS (MPLS) network, to form a peer between the edge routers (M-LER) of the MPLS network and LSP (Label Switched Path) LSP setting step of setting); When the mobile network moves and is connected to one edge router (M-LER), the one edge router (M-LER) receives the movement information from the mobile router (MR) of the mobile network to another edge router (M-LER). An optimal route setting step of transmitting and indicating a moving position; And a data forwarding step of transferring data through a predetermined LSP between edge routers (M-LERs).

4. Important uses of the invention

The present invention is used in the MPLS network.

MPLS, Route Optimization, Edge Routers, Mobile Networks, Mobile Routers, Nodes

Description

Routing optimization method for IP mobility service in MPS network {Routing optimization method for IP network mobility in MPLS network}             

1 is a diagram illustrating a configuration of a general IP network mobility service;

2 is a diagram illustrating an MPLS network configuration providing an IP network mobility service to which the present invention is applied;

3 is a diagram illustrating an embodiment of a path optimization method for an IP mobility service in an MPLS network according to the present invention;

4 is a diagram illustrating an embodiment of a data structure of an MPLS edge router (M-LER) and a mobile router used in the present invention;

5 is a diagram illustrating an interworking structure between MPLS networks according to an embodiment of the present invention.

* Explanation of symbols for the main parts of the drawings

11: correspondence node (CN) 12: access router (AR)

13: home agent (HA) 14: MPLS edge router (M-LER)

21: Mobile Router (MR) 22: Mobile Network Node (MNN)

The present invention relates to a path optimization method for an IP (Internet Protocol) mobility service in an MPLS network, and more particularly, to data transmission of a mobile terminal and a mobile network using an MPLS network. By optimizing the path, the present invention relates to a path optimization method capable of efficiently providing a mobility service of an IP network.

Due to the recent widespread use of public WLAN and general WLAN services, Internet terminals can receive services while maintaining connectivity with the Internet wirelessly without changing IP addresses in certain areas. In the future, users will be required to use their laptops to access the Internet service in cars, trains, buses, airplanes and passenger ships. However, in order to enable such a service, a mobility service for a network, not a terminal, must be provided.

The term 'network mobility service' refers to supporting an arbitrary terminal to continue communication with other nodes on the Internet even when the entire network to which it belongs moves and the access point with the Internet changes.

In this regard, the IETF is discussing network mobility (NEMO). NEMO was first proposed at the 52nd IETF meeting in 2001, and the MONET (Mobile Network) BOF (Birds of Feather group) was created at the 53rd meeting in 2002 and renamed to the new name at the 55th meeting in 2002. This was formed. The NEMO protocol is being standardized as an extension based on the Mobile IPv6 protocol.

Referring to FIG. 1, the IP network mobility service structure is as follows.

When the mobile network 20 is registered with the Home Agent (HA) 13 and is receiving service, the mobile network 20 moves to a location adjacent to the access router (AR) 12-4, A tunnel is formed between the home agent 13 and the mobile router 21.

Accordingly, the traffic of the terminals (mobile network node (MNN) 22 in the mobile network 20 always passes through the home agent 13 through this tunnel and corresponds to a Correspondent Node (CN) 11. Is delivered. Thus, despite the shorter path, there has always been a problem of passing through the home agent 13.

For reference, as a prior art related to the present invention, a " move " for enabling a shortest path communication between a mobile node implementing Mobile Internet Protocol version 6 (Mobile-IPv6) and a relative stationary node not implementing Mobile-IPv6. Communication system and the shortest path communication method (Korean Patent Laid-Open Publication No. 2004-63830, published on July 14, 2004) (hereinafter referred to as “prior art”) exist, and the prior art is optimized for the mobility service of the mobile terminal. By providing a path, when the partner node does not have a mobile-IPv6 function, which is a mobility function, it provides an optimal path service for an IPv6 terminal. On the contrary, the present invention provides the mobility of the mobile network efficiently. When the mobile router receives the moving information from the edge router (M-LER) of the MPLS network and transmits the information to another necessary edge router (M-LER), it informs the moving location. The distinction is made in optimizing the path by passing data through a suitable Label Switched Path (LSP) preset between edge routers (M-LERs).

The present invention has been proposed to solve the above problems, and in order to more efficiently provide mobility of a mobile network, when an edge router of an MPLS network receives movement information and transmits the information to another edge router as needed, the edge router is informed of the location of the mobile router. The purpose of the present invention is to provide a path optimization method for optimizing a path by transferring data through an appropriate LSP previously set.

Other objects and advantages of the present invention 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.

The present invention for achieving the above object, in the path optimization method for mobility services of IP (IP) network in MPLS (MPLS) network, the peer (Peer) between the edge routers (M-LER) of the MPLS network Establishing an LSP (Label Switched Path); When the mobile network moves and is connected to one edge router (M-LER), the one edge router (M-LER) receives the movement information from the mobile router (MR) of the mobile network to another edge router (M-LER). An optimal route setting step of transmitting and indicating a moving position; And a data forwarding step of transferring data through a predetermined LSP between edge routers (M-LERs).

The present invention is provided with an MPLS network including an MPLS edge router (M-LER) for providing IP mobility service in order to more efficiently provide mobility services of an IP network through an MPLS network, and the mobile network moves to an edge router. When the mobility service is received from the mobile station, the optimized LSP service is provided by using the LSP set in advance between all M-LERs.

To this end, the present invention receives the movement information from the edge router (M-LER) of the MPLS network and transfers it to other edge routers (M-LER) required to inform the location of the movement, the data is transmitted through the appropriate LSP preset between the edge routers By passing, the path can be optimized.

According to the present invention, each corresponding terminal (corresponding node) does not need to perform a process for path optimization, and the routing information of the mobile network is transmitted only to the edge router (M-LER) of the MPLS network, thereby processing traffic overhead. Can be reduced. In addition, the path of various corresponding nodes CN may be optimized in one edge router M-LER.

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.

2 is a diagram illustrating an MPLS network configuration providing an IP network mobility service to which the present invention is applied.

In order to provide IP network mobility service in an MPLS network, an LSP is set between MPLS edge routers (M-LERs) having mobility service functions. These LSPs then map to routes delivered through the BGP peer. In this case, when the mobile network 20 moves adjacent to any MPLS edge router (M-LER) 14-4, the mobile network 20 optimizes and transmits a path through the LSP to the corresponding node (CN) 11. . To do this, it is necessary to maintain binding information related to movement in the MPLS edge router (M-LER) 14-4.

Here, BGP (Border Gateway Protocol) is a protocol used for exchanging Internet route information between autonomous systems, and is one of EGP (Exterior Gateway Protocol). The routing table contains a list of known routers, accessible addresses, and cost information associated with the route to each router to select the best route.

In the present invention, the data transmission path of the mobile terminal and the mobile network is optimized using the MPLS network. This provides path optimization for IP network mobility at the edge router (M-LER) 14 of the MPLS network.

The MPLS edge router (M-LER) 14 receives the binding information, which is the movement information of the IP network, stores the binding information in the binding cache, and maps the label information base (LIB) by mapping the binding information to an appropriate LSP that is set in advance using the binding information. Configure.

Therefore, each corresponding terminal (corresponding node CN) 11 does not have to perform complicated calculations for path optimization. In fact, when the terminal (mobile network node (MNN)) 22 of the mobile network 20 is to be optimized, if the optimization is not performed when the corresponding terminal (corresponding node (CN)) 11 does not support the optimization, Even if it supports, the processing speed for optimization is slow. Accordingly, by performing the binding information, which is routing information related to mobility, in the edge router (M-LER) 14 having the MPLS intranet routing function, the terminal (mobile network node (MNN)) 22 does not add an optimization function. There is no need for further processing. In particular, in the NEMO service of the network, since the mobile-related information is information about the entire routes of the mobile network instead of a single address, it is more appropriate to provide this in the network.

And, if the mobile terminal (mobile network node (MNN)) 22 requires QoS guarantee service, it can be extended to accommodate this through a differentiated LSP.

For reference, in order to deliver the binding information of the mobile network 20 to all corresponding nodes (CN) 11 for path optimization, a phenomenon in which a traffic amount is increased to waste resources of the network, Corresponding nodes (CN) 11 must have a movement related processing function, and there is a burden that corresponding node (CN) 11 must have a computational overhead for movement related processing. In addition, the mobile router (MR) 21 also has a burden of transmitting and managing binding information for each corresponding node (CN) 11.

Then, an MPLS network is provided that includes an edge router (M-LER) 14 that provides IP mobility services, and the mobile network 20 moves to receive mobility services from the edge router (M-LER) 14. In the following, a method for providing an optimized path service using an LSP configured between all MPLS edge routers (M-LERs) 14 in advance will be described in detail with reference to FIG. 3.

3 is an exemplary diagram illustrating a path optimization method for an IP mobility service in an MPLS network according to the present invention.

First, BGP routing is performed between all MPLS edge routers (M-LERs) 14, and an aggregated LSP or a quality assurance LSP is set (301).

That is, the MPLS edge routers (M-LER) 14 establish a peer with the counterpart MPLS edge routers (M-LER) 14 by the BGP protocol, and transfer routing information to each other. When receiving the BGP routing information, it is possible to distinguish which BGP peer has received the information. Therefore, add a BGP peer identifier to the IP routing table. Then, the LSP is set up between the two peers and the LSP is mapped to all roots of the peer identifier. In this form, a BGP peer is established between all MPLS edge routers (M-LERs) 14 and an LSP is established.

Subsequently, the mobile router (MR) 21 receives a mobile sensing and care-of-address (COA) from the mobile network 20 (302).

The mobile router (MR) 21 registers binding information with the home agent (HA) 13 (303). The home agent (HA) 13 then stores the binding information in the binding cache (304).

Thereafter, the terminals (mobile network node (MNN)) 22 in the mobile network 20 transmit data to the corresponding node (CN) 11 via a path via the home agent (HA) 13 ( 305).

Next, the mobile router (MR) 21 carries the binding and prefix information to the neighboring MPLS edge router (M-LER) 14-4 by carrying the binding and prefix information on the message requesting optimization (306).

That is, when the mobile network 20 moves to the MPLS network and is connected to the MPLS edge router (M-LER) 14, the mobile router (MR) 21 of the mobile network 20 is the MPLS edge router (M-LER). After receiving the address (COA) from the (14) (302), and registers the home address and binding information of the COA with the home agent (HA) 13 (303). Then, in order to optimize the path with the corresponding nodes (CN) 11 of the terminals (mobile network node (MNN)) 22 in the mobile network 20, the mobile router (MR) 21 is adjacent to. Send a message to the MPLS Edge Router (M-LER) 14-4 requesting optimization. This message contains the address and binding information of the correspondent nodes (CN) 11 and the prefix information of the mobile network 20.

The path optimization request message transmitted from the mobile router (MR) 21 to the MPLS edge router (M-LER) is as follows.

CN addresses Binding information Prefix Information

The MPLS edge router (M-LER) 14-4 receiving the optimization request message receives the addresses of the corresponding nodes (CN) 11 and stores them in the binding cache (307). The MPLS edge router (M-LER) 14-4, which has received the optimization request message, then receives the MPLS edge router (M-LER) 14- corresponding to the address of this correspondent node (CN) 11-1. The optimization request message (including binding information and prefix information) is transmitted to 1 as it is (308). The MPLS edge router (M-LER) 14-1 receiving this also stores the binding information in the binding cache (309).

The path optimization request message transmitted between the MPLS edge routers (M-LER) 14 is as follows.

Binding information Prefix Information Peer LER identifier

Thereafter, data transfer is performed between the mobile network node (MNN) 22-1 and the corresponding node (CN) 11-1 through the LSP of the optimal path (310).

In the above, the mobile router (MR) 21 registers the binding information with the home agent (HA) 13 (303), and then transfers the data packet through the home agent (HA) 13 (305). . Then, when optimization is made and the corresponding nodes (CN) 11 are forwarded and forwarded to the optimal path via the MPLS edge router (M-LER) 14, the mobile router (MR) 21 Also forward data to the optimal path. The MPLS edge router (M-LER) 14 then forwards the data through the LSP.

The data structure of the MPLS edge router (M-LER) 14 and the mobile router (MR) 21 is as shown in FIG.

As shown in FIG. 4, the MPLS edge router (M-LER) 14 includes an M-LER peer table (peer LER identifier) 401 and a routing table (destination IP, nexthop information, peer identifier) 402. , LSP information table (LIB) (peer identifier, LSP identifier) 403, QoS-supported LIB (QoS Class, peer identifier, LSP identifier) 404, binding cache (binding information, prefixes, expiration date) 405 And the like.

Here, unlike the general case, the routing table 402 has a peer identifier. This means an M-LER peer, which also means an internal BGP peer. Routes with the same identifier are combined and mapped into a single LSP. And, if providing a quality assurance LSP, it may include a QoS support LIB (404). And a binding cache 405 having movement information of the mobile network 20. The information in the binding cache 405 is temporary path information for the validity period.

On the other hand, the mobile router (MR) 21 is a binding update list (binding information, prefixes, receiving address, valid time) 406 and a list of corresponding nodes (CN) 11 (destination IP address of the egress packet). (407).

Here, the binding update list 406 holds the binding information and the information on the transmitting side that sent the binding information. Then, information about the counterpart nodes (corresponding nodes CN) 11 with which terminals (mobile network node (MNN)) 22 in the mobile network 20 communicate is maintained. This information is needed to send binding information to the MPLS edge router (M-LER) 14 on the path to the correspondent node (CN) 11.

Meanwhile, the present invention can be utilized even when several MPLS networks are connected and corresponding nodes CN exist in the network. At this time, the mobile network related path information is transferred between the MPLS edge routers (M-LER) 14 existing at the edge of the MPLS network. Therefore, propagation of mobile information to routers inside the MPLS network can be avoided. In addition, data may be delivered through an optimal path through the LSP to provide a guaranteed service.

That is, as shown in FIG. 5, when the corresponding node (CN) 11 of the mobile network node (MNN) 22 in the mobile network 20 passes through one or more MPLS networks, the present invention is applied to each MPLS network. In case of application and delivery, service is possible by the optimal route.

In FIG. 5, the mobile network node (MNN) 22 and the MPLS network of the mobile network 20 adjacent to the MPLS network 1 51 through the LSPs 501 and 502 of the MPLS network 1 51 and the MPLS network 2 52. Traffic is transmitted between corresponding nodes (CNs) 11 connected to two 52.

As described above, the method of the present invention may be implemented as a program and stored in a recording medium (CD-ROM, RAM, ROM, floppy disk, hard disk, magneto-optical disk, etc.) in a computer-readable form. Since this process can be easily implemented by those skilled in the art will not be described in more detail.

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.

 The present invention as described above, when providing the optimal path for the IP mobility service in the MPLS network, in addition to the existing MPLS service, there is an effect that can easily provide a mobile service.

In particular, the present invention is to perform the binding process related to the movement in the edge router of the MPLS network, it is not necessary to process the movement-related information in each terminal, there is an effect that can prevent the waste of network resources, and eliminate unnecessary overhead .

In addition, when the service quality of the mobile service is guaranteed, the present invention can be extended to provide a service by setting a quality-guaranteed LSP.

Claims (8)

In the path optimization method for mobility service of IP network in MPLS network, LSP setting step of establishing a peer between edge routers (M-LER) of the MPLS network and establishing a label switched path (LSP); When the mobile network moves and is connected to one edge router (M-LER), the one edge router (M-LER) receives the movement information from the mobile router (MR) of the mobile network to another edge router (M-LER). An optimal route setting step of transmitting and indicating a moving position; And Data forwarding step of passing data through a preset LSP between edge routers (M-LER) Path optimization method for IP mobility service in MPS network comprising a. The method of claim 1, The MPLS network is, At least two MPLS networks are connected, and a corresponding node (CN) of a node (MNN) in a mobile network passes through at least one MPLS network. The method according to claim 1 or 2, The LSP setting step, Border Gateway Protocol (BGP) routing between all edge routers (M-LERs), and aggregated LSP or quality assurance LSP, characterized in that the route optimization method for IP mobility services in MPS network. The method of claim 3, wherein When the one edge router (M-LER) forms a peer with the other edge router (M-LER) by BGP protocol, transfers routing information to each other, and receives BGP routing information, which BGP peer is information received from BGP peers are established between all edge routers (M-LERs) by adding a BGP peer identifier to the IP routing table, establishing an LSP between the two peers, and mapping LSPs for all routes owned by that peer identifier. A route optimization method for IP mobility service in MPS network, characterized by setting LSP. The method of claim 3, wherein After the mobile router MR registers the binding information with the home agent HA, the mobile router MR transfers data packets through the home agent HA. Then, the optimization is performed and the corresponding nodes CN are edge routers M-. If the data is forwarded to the optimal path through LER and forwarded, the data is forwarded to the optimal path so that the edge router (M-LER) forwards the data through the LSP. Path optimization method for mobility service. The method of claim 5, The optimal path setting step, Registering, by the mobile router (MR), a mobile sensing and a binding address (COA) from the mobile network to register binding information with a home agent (HA); Storing, by the home agent (HA), binding information in a binding cache; Transmitting data to the corresponding node (CN) by a terminal (MNN) in the mobile network via a path via the home agent (HA); The mobile router (MR) forwarding a message requesting optimization to the adjacent one edge router (M-LER); The one edge router (M-LER) receiving the optimization request message receives the addresses of the corresponding nodes (CN) and stores them in the binding cache, and then the other edge router (M) corresponding to the addresses of the corresponding nodes (CN). Forwarding the optimization request message to the LER; And The edge router (M-LER) storing binding information in a binding cache Path optimization method for IP mobility service in MPS network comprising a. The method of claim 6, The path optimization request message transmitted by the mobile router (MR) to the one edge router (M-LER), Path optimization method for IP mobility service in MPS network comprising corresponding node (CN) addresses, binding information, prefix information. The method of claim 6, The path optimization request message transmitted between the edge routers (M-LER), Path optimization method for IP mobility service in MPS network, characterized in that it comprises binding information, prefix information, peer LER identifier.

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