CN103516603A - Routing optimization method, device and system - Google Patents
Routing optimization method, device and system Download PDFInfo
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Abstract
The invention provides a routing optimization method, a device and a system. The method comprises the following steps: an LMA is used to receive the MAG routing optimization supporting capacity and/or tunnel capacity sent by a MAG corresponding to a data link when the data link is established; and the LMA is used to perform a routing optimization decision to optimize the data link according to the MAG routing optimization supporting capacity and/or tunnel capacity. Through the technical scheme provided in the invention, the problem that subsequent decision errors will be caused by the capacity inconsistency between PMIP network elements can be solved, so that effects of avoiding process rollback and reducing the operation complexity can be realized.
Description
Technical field
The present invention relates to the communications field, in particular to a kind of routing optimization method, Apparatus and system.
Background technology
Transmission control protocol/Internet Interconnection agreement (Transmission Control Protocol/Internet Protocol, referred to as TCP/IP), when initial designs, do not consider that the situation that topology location changes can occur terminal, ICP/IP protocol itself is not supported mobility.In traditional TCP/IP network environment Zhong，IPWei internet (Internet), provide routing function, it has all distributed logical address to all nodes (comprising main frame and router), JiIP address, and each port of every main frame all distributes a GeIP address.IP address packet includes network prefix and host machine part, the IP address of the All hosts on same link has identical network prefix and different host machine part conventionally.This makes IP partly to carry out Route Selection according to the network prefix of the IP address of destination node, thereby makes router order preserve a simple prefix router, and needn't be that every main frame is preserved an independent route.In this case, owing to having adopted prefix router, therefore when node does not change QiIP address from a link switching to another link, this node can not receive data message on new link, thereby also just cannot communicate with other nodes.
Along with user sharply rises to the demand of mobility and information, increasing people wishes, at mobile process high speed ground accessing Internet, to obtain the information of urgent need, completes and wants the thing done.Therefore, mobile Internet becomes the developing direction of Future Internet, but conventional TCP/IP agreement is not supported ambulant defect, and making becomes to the mobile management of terminal node a great problem that mobile Internet is faced.
In order to solve mobile management problem, the mobile management technology that industry is popular, as Mobile IP (Mobile IP, referred to as MIP), proxy-mobile IP (Proxy MIP, referred to as PMIP) etc., all by introducing the mode of fixed anchor point (Anchor), carry out the mobility of support terminal.For example, MIP agreement is used home agent (Home agent, HA) to use local mobile anchor point (Local Mobility Anchor, LMA) as anchor point as anchor point, PMIP agreement.
Shown in Fig. 1 is the logical architecture of PMIP agreement, comprise terminal node (Mobile Node, referred to as MN), peer node (Correspondent Node, referred to as CN), Mobile Access Gateway (Mobile Access Gateway, referred to as MAG) and local mobile anchor (Local Mobility Anchor, referred to as LMA).Wherein CN can be stationary nodes, can be also mobile node, has corresponding MAG and LMA.MAG is the first hop router of MN, when its Main Function is included in MN access, for it distributes the PMIP between Care-of Address (Care ofAddress, referred to as CoA) and replacement MN execution and the anchor point LMA of MN, binds (PMIP Binding).LMA is as the anchor point of MN, and its Main Function is included as MN and distributes home address (Home ofAddress, HoA) and process above-mentioned PMIP binding.The main purpose of the PMIP binding of carrying out between MAG and LMA be allow both sides all know the other side address, be above-mentioned CoA and HoA, and binding relationship is kept to this locality.In addition,, in carrying out the binding procedure of PMIP, also for MN, between MAG and LMA, set up a bidirectional tunnel.What deserves to be explained is, the IP address that MN finally gets is that LMA is the HoA of its distribution.In common network design, MAG is generally positioned at topological compare Di position, such as being positioned at the edge of metropolitan area network; LMA is generally positioned at topological compare Gao position, such as province Gan Wang core.Between MAG and LMA, in fact often by multiple router hops, be connected.
In PMIP territory, between mobile node, carry out the system architecture of routing optimality as shown in Figure 2, in order to make the path of data packet transmission reach optimum, when terminal node and peer node are all within same PMIP territory, terminal node or peer node can be used the MAG of local terminal from other network elements, to get the current service MAG of other one end, thereby between two MAG, set up a direct link, and do not need packet to be routed to again LMA, greatly reduced the detour problem of route.
In current PMIP network because the reason of disposing may exist the inconsistent problem of network element ability between MAG, for example, for the support of routing optimality ability, or for the support of encapsulation tunnel pattern.And the inconsistent problem of ability will cause the mistake of follow-up decision between network element, even if introduce flow process rollback, also greatly increased the complexity of operation.For the problems referred to above, effective solution is not yet proposed at present.
Summary of the invention
The problem that causes follow-up decision mistake for the inconsistent meeting of ability between PMIP network element, the invention provides a kind of routing optimization method, Apparatus and system, at least to address the above problem.
According to an aspect of the present invention, provide a kind of routing optimization method, having comprised: LMA, when data link setup, has received routing optimality tenability and/or the tunnel ability of the MAG of MAG transmission corresponding to this data link; LMA, according to the routing optimality tenability of MAG and/or tunnel ability, carries out route optimization decision, optimizes this data link.
Preferably, LMA, according to the routing optimality tenability of MAG and/or tunnel ability, carries out route optimization decision, and optimization data link comprises: LMA carries out decision-making according to the routing optimality tenability of MAG, sends routing optimality notice respectively to MAG; MAG receives after routing optimality notice, carries out voluntarily tunnel encapsulation mode negotiation, sets up tunnel and carry out data retransmission between MAG.
Preferably, LMA is according to the routing optimality tenability of MAG and/or tunnel ability, carry out route optimization decision, optimization data link comprises: LMA carries out decision-making according to the routing optimality tenability of MAG, to MAG, send routing optimality notice respectively, according to MAG tunnel ability, carry out tunnel encapsulation mode negotiation, and the tunnel encapsulation type after consulting is carried in routing optimality notice and sends to respectively MAG simultaneously; MAG receives routing optimality notice, and the tunnel encapsulation type of carrying according to routing optimality notice is set up tunnel and carried out data retransmission between MAG.
Preferably, LMA is when data link setup, the routing optimality tenability and/or the tunnel ability that receive the MAG that MAG corresponding to data link send comprise: LMA receive that MAG sends for carrying out the agent binding update messages of IP registration, wherein, agent binding update messages comprises routing optimality tenability and/or the tunnel ability of MAG.
According to a further aspect in the invention, provide a kind of LMA, having comprised: receiver module, for when the data link setup, has received routing optimality tenability and/or the tunnel ability of the MAG that MAG corresponding to this data link send; Optimize module, for according to the routing optimality tenability of MAG and/or tunnel ability, carry out route optimization decision, optimize this data link.
Preferably, optimizing module comprises: first optimizes unit, for carrying out decision-making according to the routing optimality tenability of MAG, to MAG, send routing optimality notice respectively, make MAG carry out voluntarily tunnel encapsulation mode negotiation and between MAG, set up tunnel and carry out data retransmission; And/or second optimize unit, for carrying out decision-making according to the routing optimality tenability of MAG, to MAG, send routing optimality notice respectively, according to MAG tunnel ability, carry out tunnel encapsulation mode negotiation simultaneously, and the tunnel encapsulation type after consulting is carried in routing optimality notice and sends to respectively MAG, the tunnel encapsulation type that MAG is carried according to routing optimality notice is set up tunnel and is carried out data retransmission between MAG.
Preferably, the routing optimality tenability of MAG and/or tunnel ability are carried at for carrying out the agent binding update messages of IP registration and are sent to LMA by MAG.
According to another aspect of the invention, provide a kind of MAG, having comprised: sending module, for when the data link setup, has sent to LMA by the routing optimality tenability of this MAG and/or tunnel ability.
Preferably, this MAG also comprises: negotiation module, and the routing optimality notice sending for receiving LMA, other MAGs corresponding with data link carry out tunnel encapsulation mode negotiation, set up tunnel and carry out data retransmission between this MAG and other MAG; And/or set up module, the routing optimality notice sending for receiving LMA, carries out after tunnel encapsulation mode negotiation definite tunnel encapsulation type according to the LMA carrying in routing optimality notice and between this MAG other MAGs corresponding with data link, sets up tunnel and carry out data retransmission.
Preferably, sending module, for when the data link setup, is carried at the routing optimality tenability of this MAG and/or tunnel ability for carrying out the agent binding update messages of IP registration and sends to LMA.
According to another aspect of the invention, provide a kind of PMIP system.Comprise: above-mentioned arbitrary LMA and above-mentioned any one MAG.
By the present invention, employing is when data link setup, LMA obtains routing optimality tenability and/or the tunnel ability of MAG, and according to the routing optimality tenability of MAG and/or tunnel ability, carry out the scheme of routing optimality, solved the problem that the inconsistent meeting of ability between PMIP network element causes follow-up decision mistake, and then reached and avoid flow process rollback, reduce the effect of operation complexity.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, forms the application's a part, and schematic description and description of the present invention is used for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the structure system schematic diagram of PMIP system;
Fig. 2 carries out the system architecture diagram of routing optimality between mobile node in PMIP territory;
Fig. 3 is according to the flow chart of the routing optimization method of the embodiment of the present invention;
Fig. 4 is the schematic flow sheet that the terminal of the example according to the present invention is registered in PMIP territory;
Fig. 5 is the schematic flow sheet that the terminal of the example according to the present invention is carried out the method one of routing optimality in PMIP territory;
Fig. 6 is that the terminal of the example according to the present invention is carried out the schematic flow sheet of the method two of routing optimality in PMIP territory;
Fig. 7 is according to the structured flowchart of the LMA of the embodiment of the present invention.
Embodiment
Hereinafter with reference to accompanying drawing, also describe the present invention in detail in conjunction with the embodiments.It should be noted that, in the situation that not conflicting, embodiment and the feature in embodiment in the application can combine mutually.
Fig. 3 is according to the flow chart of the routing optimization method of the embodiment of the present invention.As shown in Figure 3, according to the routing optimization method of the embodiment of the present invention, comprise:
Step S302, LMA, when data link setup, receives routing optimality tenability and/or the tunnel ability of the MAG of MAG transmission corresponding to this data link;
Step S304, LMA, according to the routing optimality tenability of MAG and/or tunnel ability, carries out route optimization decision, optimizes this data link.
The method that the present embodiment provides can when data link setup, make corresponding MAG be optimized tenability and/or tunnel ability is now issued LMA, like this LMA just can have according to carry out routing optimality, thereby the mutual and rollback of having avoided blindly optimizing the repeatedly inactive signaling bringing, greatly reduces operation complexity.In general, a MAG corresponding to data link comprises MAG and MAG corresponding to CN that MN is corresponding.
At LMA, known after the routing optimality tenability and/or tunnel ability of the MAG that data link is corresponding, LMA can adopt various ways to carry out route optimization decision to realize the routing optimality of data link according to the routing optimality tenability of MAG and/or tunnel ability, and this preferred embodiment provides a kind of preferred mode.Preferably, LMA, according to the routing optimality tenability of MAG and/or tunnel ability, carries out route optimization decision, and optimizing this data link can comprise: LMA carries out decision-making according to the routing optimality tenability of MAG, sends routing optimality notice respectively to MAG; MAG receives after routing optimality notice, carries out voluntarily tunnel encapsulation mode negotiation, sets up tunnel and carry out data retransmission between MAG.
Because LMA has been known the routing optimality tenability of MAG, therefore LMA can know whether MAG supports routing optimality in advance, when corresponding MAG supports routing optimality, LMA can send routing optimality notice to MAG, can avoid repeatedly so mutual the and rollback of inactive signaling.MAG, after receiving routing optimality notice, can carry out tunnel encapsulation mode negotiation voluntarily, by mutual several times, determines the tunnel encapsulation type of setting up tunnel use, and the final tunnel of setting up for forwarding data, and data need not be forwarded by LMA again.In this preferred embodiment, LMA has in fact only utilized the routing optimality tenability of MAG.
Preferably, this preferred embodiment has provided another kind of LMA and has carried out route optimization decision to realize the mode of data link routing optimality according to the routing optimality tenability of MAG and/or tunnel ability.Preferably, LMA is according to the routing optimality tenability of MAG and/or tunnel ability, carry out route optimization decision, optimizing this data link can comprise: LMA determines according to the routing optimality tenability of MAG, to MAG, send routing optimality notice respectively, according to MAG tunnel ability, carry out tunnel encapsulation mode negotiation, and the tunnel encapsulation type after consulting is carried in routing optimality notice and sends to respectively MAG simultaneously; MAG receives above-mentioned routing optimality notice, and the tunnel encapsulation type of carrying according to routing optimality notice is set up tunnel and carried out data retransmission between MAG.
In this preferred embodiment, LMA has utilized routing optimality tenability and tunnel ability simultaneously, judge whether MAG can support the operation of routing optimality and tunnel encapsulation mode negotiation all by LMA, to be completed, simplified and between MAG, set up the flow process that tunnel carries out data retransmission, further reduced the complexity of operation.
In implementing process of the present invention, the routing optimality tenability of MAG and/or the mode of tunnel ability that LMA receives MAG transmission are also diversified, and this preferred embodiment provides preferred embodiment a kind of.Preferably, LMA is when data link setup, the routing optimality tenability and/or the tunnel ability that receive the MAG that MAG corresponding to this data link send can comprise: LMA receive that MAG sends for carrying out agent binding update (the Proxy Binding Update of IP registration, referred to as PBU) message, wherein, agent binding update messages comprises routing optimality tenability and/or the tunnel ability of MAG.
In this preferred embodiment, MAG can be carried at its routing optimality tenability and/or tunnel ability for carrying out the agent binding update messages of IP registration and send to LMA, this mode can not increase new flow process, can not exert an influence to existing procedure yet, realize simply, also can make LMA in the very first time, know routing optimality tenability and/or the tunnel ability of MAG simultaneously.
Below in conjunction with example, above preferred embodiment is elaborated.
Fig. 4 is the schematic flow sheet that the terminal of the example according to the present invention is registered in PMIP territory.As shown in Figure 4, comprise the following steps:
Step S402, terminal node MN1 sends and adheres to request to Mobile Access Gateway MAG1.
Step S404, MAG1 sends PBU message to local mobile anchor LMA and carries out mobile IP registration, and MAG1 is included in this message the tenability of routing optimality and/or tunnel ability.
Step S406～S408, LMA sends agent binding response (Proxy Binding Acknowledge, referred to as PBA) message to MAG1, and MAG1 sends and adheres to response to MN1 subsequently.
Step S410, terminal node MN2 sends and adheres to request to Mobile Access Gateway MAG2.
Step S412, MAG2 sends PBU message to local mobile anchor LMA and carries out mobile IP registration, and MAG2 is included in this message the tenability of routing optimality and/or tunnel ability.LMA can store the ability information of two MAG as follow-up foundation of carrying out route optimization decision.
Step S414～S416, LMA sends agent binding response (Proxy Binding Acknowledge, PBA) message to MAG2, and MAG2 sends and adheres to response to MN2 subsequently.
Flow process shown in Fig. 4 is follow-up basis of carrying out routing optimality.
Fig. 5 is the schematic flow sheet that the terminal of the example according to the present invention is carried out the method one of routing optimality in PMIP territory.As shown in Figure 5, method one comprises the following steps:
Step S502, terminal node MN1 sends data to MN2, and middle meeting is by MAG1, the forwarding of LMA and MAG2.
Step S504, LMA can carry out decision-making for the tenability of routing optimality according to MAG when initiating routing optimality, if MAG supports routing optimality, initiate routing optimality flow process, thereby effectively prevent from not supporting due to MAG the mutual and rollback of the repeatedly inactive signaling that optimization causes.
Step S506-S508, LMA sends routing optimality notice to MAG1 and MAG2 respectively.
Step S510-S512, MAG1 and MAG2 return to routing optimality response to LMA.
Step S514, MAG1 initiates tunnel to MAG2 and sets up request, and in request, carries generic route encapsulation (General Routing Encapsulation, referred to as GRE) Key.
Step S516, if MAG2 does not support GRE encapsulation mode, the tunnel returning to MAG1 is set up in response and is carried the indication of not supporting GRE encapsulation mode.
Step S518-S520, holds consultation between MAG1 and MAG2, the Model Establishment of employing GRE encapsulation Only tunnel between the two.
Step S522, the data between MN1 and MN2 will no longer be passed through LMA transfer, and use the tunnel between MAG1 and MAG2 to carry out transfer.
Fig. 6 is that the terminal of the example according to the present invention is carried out the schematic flow sheet of the method two of routing optimality in PMIP territory.As shown in Figure 6, method two comprises the following steps:
Step S602, terminal node MN1 sends data to MN2, and middle meeting is by MAG1, the forwarding of LMA and MAG2.
Step S604, the tunnel encapsulation ability that can support for tenability and the MAG of routing optimality according to MAG when LMA initiates routing optimality is carried out decision-making, if MAG supports routing optimality, initiate routing optimality flow process, on LMA, carry out the negotiation of tunnel encapsulation pattern simultaneously, thereby the mutual and rollback that effectively prevents from not supporting due to MAG the repeatedly inactive signaling that optimization causes, has also saved the flow process of carrying out tunnel encapsulation capability negotiation between follow-up MAG.
Step S606-S608, LMA sends routing optimality notice to MAG1 and MAG2 respectively, and carries the tunnel encapsulation type after negotiation in this notice.
Step S610-S612, MAG1 and MAG2 return to routing optimality response to LMA.
Step S614, MAG1 and MAG2 set up corresponding PMIP tunnel according to the tunnel encapsulation type after consulting.
Step S616, the data between MN1 and MN2 will no longer be passed through LMA transfer, and use the tunnel between MAG1 and MAG2 to carry out transfer.
Fig. 7 is according to the structure chart of the LMA of the embodiment of the present invention.As shown in Figure 7, according to the LMA of the embodiment of the present invention, comprise:
The LMA that the present embodiment provides can obtain optimization tenability and/or the tunnel ability of corresponding MAG when data link setup, like this LMA just can have according to carry out routing optimality, thereby the mutual and rollback of having avoided blindly optimizing the repeatedly inactive signaling bringing, greatly reduces operation complexity.
Preferably, optimizing module 74 can comprise:
First optimizes unit, for the routing optimality tenability according to MAG, carries out decision-making, sends routing optimality notice respectively to MAG, makes MAG carry out voluntarily tunnel encapsulation mode negotiation and between MAG, set up tunnel and carry out data retransmission; And/or
Second optimizes unit, for carrying out decision-making according to the routing optimality tenability of MAG, to MAG, send routing optimality notice respectively, according to MAG tunnel ability, carry out tunnel encapsulation mode negotiation simultaneously, and the tunnel encapsulation type after consulting is carried in routing optimality notice and sends to respectively MAG, the tunnel encapsulation type that MAG is carried according to routing optimality notice is set up tunnel and is carried out data retransmission between MAG.
In this preferred embodiment, the first routing optimality tenability of MAG of having optimized unit by using, mutual and the rollback of the repeatedly inactive signaling of having avoided MAG not support to optimize and having caused, second routing optimality tenability and the tunnel ability of MAG of having optimized unit by using, mutual and the rollback of the repeatedly inactive signaling of both having avoided MAG not support to optimize and having caused, has also saved the flow process of carrying out tunnel encapsulation mode negotiation between follow-up MAG.
Preferably, the routing optimality tenability of MAG and/or tunnel ability are carried at for carrying out the agent binding update messages of IP registration and are sent to LMA by MAG.
MAG is carried at its routing optimality tenability and/or tunnel ability for carrying out the agent binding update messages of IP registration and sends to LMA, can not increase new flow process, can not exert an influence to existing procedure yet, realize simply, also can make LMA in the very first time, know routing optimality tenability and/or the tunnel ability of MAG simultaneously.
Corresponding with above-described embodiment and the LMA that provides is preferably provided, the present embodiment provides a kind of MAG, comprising: sending module, for when the data link setup, sends to LMA by the routing optimality tenability of this MAG and/or tunnel ability.
Preferably, above-mentioned MAG can also comprise:
Negotiation module, the routing optimality notice sending for receiving LMA, other MAGs corresponding with data link carry out tunnel encapsulation mode negotiation, set up tunnel and carry out data retransmission between this MAG and above-mentioned other MAG; And/or
Set up module, the routing optimality notice sending for receiving LMA, carries out after tunnel encapsulation mode negotiation definite tunnel encapsulation type according to the LMA carrying in routing optimality notice and between this MAG other MAGs corresponding with data link, sets up tunnel and carry out data retransmission.
Preferably, sending module, for when the data link setup, is carried at the routing optimality tenability of this MAG and/or tunnel ability for carrying out the agent binding update messages of IP registration and sends to LMA.
The present embodiment provides a kind of PMIP system (or it is pre-to be called PMIP), comprising according to the LMA of above-mentioned arbitrary embodiment or preferred embodiment and according to the MAG of above-mentioned arbitrary embodiment or preferred embodiment.The working method of the PMIP system that the present embodiment provides, above has a detailed description, repeats no more herein.
From above description, can find out, technical scheme provided by the invention has solved the problem that the inconsistent meeting of ability between PMIP network element causes follow-up decision mistake, can effectively prevent from not supporting due to MAG the mutual and rollback of the repeatedly inactive signaling that optimization causes, also can save the flow process of carrying out tunnel encapsulation capability negotiation between follow-up MAG, greatly reduce operation complexity.
Obviously, those skilled in the art should be understood that, above-mentioned each module of the present invention or each step can realize with general calculation element, they can concentrate on single calculation element, or be distributed on the network that a plurality of calculation elements form, alternatively, they can be realized with the executable program code of calculation element, thereby, they can be stored in storage device and be carried out by calculation element, and in some cases, can carry out shown or described step with the order being different from herein, or they are made into respectively to each integrated circuit modules, or a plurality of modules in them or step are made into single integrated circuit module to be realized.Like this, the present invention is not restricted to any specific hardware and software combination.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (11)
1. a routing optimization method, is characterized in that, comprising:
Local mobile anchor LMA, when data link setup, receives routing optimality tenability and/or the tunnel ability of the described MAG of Mobile Access Gateway MAG transmission corresponding to described data link;
Described LMA, according to the routing optimality tenability of described MAG and/or tunnel ability, carries out route optimization decision, optimizes described data link.
2. method according to claim 1, is characterized in that, described LMA, according to the routing optimality tenability of described MAG and/or tunnel ability, carries out route optimization decision, optimizes described data link and comprises:
Described LMA carries out decision-making according to the routing optimality tenability of described MAG, sends routing optimality notice respectively to described MAG;
Described MAG receives after described routing optimality notice, carries out voluntarily tunnel encapsulation mode negotiation, sets up tunnel and carry out data retransmission between described MAG.
3. method according to claim 1, is characterized in that, described LMA, according to the routing optimality tenability of described MAG and/or tunnel ability, carries out route optimization decision, optimizes described data link and comprises:
Described LMA carries out decision-making according to the routing optimality tenability of described MAG, to described MAG, send routing optimality notice respectively, according to described MAG tunnel ability, carry out tunnel encapsulation mode negotiation, and the tunnel encapsulation type after consulting is carried in described routing optimality notice and sends to respectively described MAG simultaneously;
Described MAG receives described routing optimality notice, and the tunnel encapsulation type of carrying according to described routing optimality notice is set up tunnel and carried out data retransmission between described MAG.
4. according to the method described in claim 1-3 any one, it is characterized in that, described LMA is when data link setup, and the routing optimality tenability and/or the tunnel ability that receive the described MAG of MAG transmission corresponding to described data link comprise:
Described LMA receive that described MAG sends for carrying out the agent binding update messages of IP registration, wherein, described agent binding update messages comprises routing optimality tenability and/or the tunnel ability of described MAG.
5. a local mobile anchor LMA, is characterized in that, comprising:
Receiver module, for when the data link setup, receives routing optimality tenability and/or the tunnel ability of the described MAG that Mobile Access Gateway MAG corresponding to described data link send;
Optimize module, for according to the routing optimality tenability of described MAG and/or tunnel ability, carry out route optimization decision, optimize described data link.
6. LMA according to claim 5, is characterized in that, described optimization module comprises:
First optimizes unit, for the routing optimality tenability according to described MAG, carries out decision-making, sends routing optimality notice respectively to described MAG, makes described MAG carry out voluntarily tunnel encapsulation mode negotiation and between described MAG, sets up tunnel and carry out data retransmission; And/or
Second optimizes unit, for carrying out decision-making according to the routing optimality tenability of described MAG, to described MAG, send routing optimality notice respectively, according to described MAG tunnel ability, carry out tunnel encapsulation mode negotiation simultaneously, and the tunnel encapsulation type after consulting is carried in described routing optimality notice and sends to respectively described MAG, the tunnel encapsulation type that described MAG is carried according to described routing optimality notice is set up tunnel and is carried out data retransmission between described MAG.
7. according to the LMA described in claim 5 or 6, it is characterized in that, the routing optimality tenability of described MAG and/or tunnel ability are carried at for carrying out the agent binding update messages of IP registration and are sent to described LMA by described MAG.
8. a Mobile Access Gateway MAG, is characterized in that, comprising:
Sending module, for when the data link setup, sends to local mobile anchor LMA by the routing optimality tenability of this MAG and/or tunnel ability.
9. MAG according to claim 8, is characterized in that, also comprises:
Negotiation module, the routing optimality notice sending for receiving described LMA, other MAGs corresponding with described data link carry out tunnel encapsulation mode negotiation, set up tunnel and carry out data retransmission between this MAG and described other MAG; And/or
Set up module, the routing optimality notice sending for receiving described LMA, carries out after tunnel encapsulation mode negotiation definite tunnel encapsulation type according to the described LMA carrying in described routing optimality notice and between this MAG other MAGs corresponding with described data link, sets up tunnel and carry out data retransmission.
10. MAG according to claim 8 or claim 9, it is characterized in that, described sending module, for when the data link setup, is carried at the routing optimality tenability of this MAG and/or tunnel ability for carrying out the agent binding update messages of IP registration and sends to described LMA.
11. 1 kinds of proxy mobile IP systems, is characterized in that, comprise local mobile anchor LMA described in claim 5-7 any one and the Mobile Access Gateway MAG described in claim 8-10 any one.
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