CN101399766B - Network system and access method for data service - Google Patents
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- CN101399766B CN101399766B CN2007101753183A CN200710175318A CN101399766B CN 101399766 B CN101399766 B CN 101399766B CN 2007101753183 A CN2007101753183 A CN 2007101753183A CN 200710175318 A CN200710175318 A CN 200710175318A CN 101399766 B CN101399766 B CN 101399766B
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Abstract
The invention relates to a data service network system and an access method; the data service network system is provided with re-directional equipment between an access gateway and a boundary router at the user side; the re-directional equipment comprises a re-directional module which is used for redirecting the service request data packets that access the off-network services to make and generating and transmitting the re-directional routing information to a first boundary router; the first boundary router is connected with a plurality of second boundary routers by a virtual special network and is used for transmitting the service request data packets to the second boundary routers to which the routing information is directive according to the re-directional routing information; the second boundary routers are connected with the off-network service gateway and are used for transmitting the service request data packets to the service gateway. By adopting the technical proposal of the invention, the performance bottleneck of the GRD router and NAT in the network can be overcome and the off-network service gateway load is balanced by introducing the re-directional equipment.
Description
Technical field
The present invention relates to the access method of a kind of data service network system and data service, belong to network communication field.
Background technology
In today of scientific and technological develop rapidly, variation with rapid changepl. never-ending changes and improvements is also taking place in network technology.Nowadays, network provides various, colourful data service for the user, and the user is access network whenever and wherever possible, the inquiry information needed.Yet along with the continuous development of network technology, the user wishes that more colourful form obtains more resources from network, and visit is more professional.
Figure 1 shows that the structural representation of available data service network system, mainly comprise:
Subscriber equipment (user Equipment is called for short UE) is the terminal equipment of initiating service request, comprises that various mobile phone terminals, intelligent terminal etc. are with information communication terminal equipment wired or that wireless mode inserts.
IAD (Access Gateway, be called for short AG), it is sent to network that bearer service uses such as TCP/IP network or network x.25 with the service request data bag, realize the intercommunication between access network and the bearer service application network, AG can be Gateway GPRS Support Node, asymmetric digital subscriber line, Broadband Remote Access Server, Digital Subscriber Line Access Multiplexer or the like.
Access network (Access Network, be called for short AN), the network that is between UE and the AG and provides access service for UE comprises wireless access network and wired access network.
Application server (Application Server, be called for short AS) provides third party service provider/content supplier's (service Provider/content Provider is called for short SP/CP) server of application service for the user.
WAP (wireless application protocol) (Wireless Application Proocol is called for short WAP): realize operations such as protocol conversion.
NAT (Network Address Translation is called for short NAT) realizes the function of network address translation.
Generic route encapsulation (Generic Routing Encapsulation is called for short GRE) has defined the agreement that encapsulates any one other network layer protocol on a kind of network layer protocol.
Network address translation is meant a network internal, can random as required self-defined IP address, and do not need through application.A network internal, each network element device carries out communication by the IP address of inside; And when inner network element need carry out communication with outside internet network, it was that the legal IP address IP address of application (promptly through) communicates that the equipment with nat feature is responsible for the IP address transition that it is inner.Therefore common data service at present can be able to be divided into enclosed type and non-enclosed type.During the data service of user capture enclosed type, only need visit to specify the application server in the carrier network to get final product; When the non-enclosed type data service of user capture, be through specifying the network of carrier side, and then visit application server on other carrier networks.With service request from user the network of appointment carrier side of process be called Intranet; And the network of other carrier sides is called public network.Meanwhile, the enclosed type data already are called business in the net; And it is outer professional that non-enclosed type data service is called net.Therefore when the user capture net in during business, UE only need communicate with the network internal network element and gets final product, and data flow need not be passed through NAT device; And when outside the user capture net when professional, UE need communicate with the network element on the public network, and data flow need be carried out address transition through NAT device, just can set up being connected of network element on UE and the public network.
Each AS is positioned on the public network, and UE is divided in a plurality of WAP territory, uses privately owned address.When the user has service request, its service request data bag must be through the encapsulation and the decapsulation of gre tunneling, deliver to WAP gateway, carry out operations such as protocol conversion and insertion user ID by WAP gateway, again through network address translation (Network Address Translator, be called for short NAT) after, the application server on the public network could be visited.
Because user terminal distributes private IP address, and application server is positioned on the public network, use the outer IP of net address, then the terminal access server need carry out address translation.Obviously, NAT device will become the performance bottleneck of the whole network.And data service in the net in the future, such as streaming media service, use real-time streaming protocol (Real Time Streaming Protocol, abbreviation RTSP), RTP (Real time Transport Protocol, be called for short RTP), be difficult to passing through NAT, and, because the new business flow is huge, the performance bottleneck problem of NAT device certainly will be more outstanding.
Summary of the invention
The object of the present invention is to provide a kind of network system of data service and the access method of data service, to solve GRE packaging efficiency and bandwidth constraints problem, and eliminate the performance bottleneck problem that NAT changes the whole network that brings, realize the load balancing of the outer professional gateway of net.
For achieving the above object, the invention provides a kind of network system of data service, comprising: a plurality of user domain are provided with IAD (Access Gateway is hereinafter to be referred as AG), the outer professional gateway of net in each user domain;
Re-positioning device (Redirection for PSG, be called for short RPSG), be connected with described IAD, comprise a redirection module in this re-positioning device, be used for the outer professional service request data bag of visit net is redirected, generate to be redirected routing iinformation, and will to be redirected routing iinformation and this service request data bag sends to first border router;
Described first border router (Provider Edge, be called for short PE), be connected with described re-positioning device, and be connected with a plurality of second border routers by Virtual Private Network, be used for described service request data bag being sent to second border router that described routing iinformation points to according to described redirected routing iinformation;
Described second border router is connected with the outer professional gateway of described net, is used for described service request data bag is sent to the outer professional gateway of described net.
The present invention also provides a kind of network system of data service, comprising: a plurality of user domain are provided with Service Gateway (Self-owned Service Gateway is called for short SSG) in IAD, the outer professional gateway of net, the net in each user domain;
Re-positioning device is connected with described IAD, comprises in this re-positioning device:
Redirection module is used for the outer professional service request data bag of visit net is redirected, and generates and is redirected routing iinformation, and will be redirected routing iinformation and this service request data bag sends to first border router:
Service request identification control module, be connected with described redirection module, be used for the service request data bag is discerned, if described service request data bag is the outer professional service request data bag of visit net, then this packet is sent to redirection module, if, then directly be forwarded to described first border router for professional service request data bag in the visit net;
Described first border router, be connected with described re-positioning device, and be connected with second border router with a plurality of first border routers by Virtual Private Network, be used for to visit the outer professional service request data bag of net and send to second border router of described routing iinformation sensing or the address information of carrying, this service request data bag is sent to described second border router according to professional service request data bag in the visit net according to described redirected routing iinformation;
Described a plurality of second border router, is connected with Service Gateway in outer professional gateway of described net and the net respectively, is used for will the outer professional service request data bag of visit net sending to the outer professional gateway of described net, will visit the service request data bag of netting interior business and send to Service Gateway in the described net.
The present invention also provides a kind of access method of data service, comprises the steps:
IAD is sent to re-positioning device to the outer professional service request data bag of the visit net that receives:
Described re-positioning device is redirected described service request data bag, generate to be redirected routing iinformation, and will be redirected routing iinformation and this service request data bag sends to first border router;
Described first border router sends to second border router that described routing iinformation points to according to described redirected routing iinformation with described service request data bag;
Described second border router sends to the outer professional gateway of net with described service request data bag.
The present invention also provides a kind of access method of data service, comprises the steps:
IAD is sent to re-positioning device to the service request data bag that receives;
Described re-positioning device is judged described service request data bag, if described service request data bag is the outer professional service request data bag of visit net, then described service request data bag is redirected, generate to be redirected routing iinformation, and will to be redirected routing iinformation and this service request data bag sends to first border router; Described first border router sends to second border router that described routing iinformation points to according to described redirected routing iinformation with described service request data bag; Described second border router sends to the outer professional gateway of net with described service request data bag;
If described service request data bag directly is forwarded to described first border router for professional service request data bag in the visit net; Described first border router is sent to described second border router according to the address information of carrying in the service request data bag professional in the visit net with this service request data bag; Described second border router sends to Service Gateway in the net with described service request data bag.
Based on technique scheme, the present invention has reached following beneficial effect:
1, need not through data service in the network address translation visit net.By making up Virtual Private Network, Service Gateway links to each other with Virtual Private Network by border router in will netting, and the user is linked to each other with Virtual Private Network by border router, makes the user need not through data service in the network address translation visit net.
2,, make the outer professional gateway load-balancing of net by introducing re-positioning device.
3, eliminated the performance bottleneck problem of GRE router in the network.By making up Virtual Private Network, and will net outer professional gateway and link to each other with Virtual Private Network, need not process GRE router when making the outer business of user capture net, eliminate the performance bottleneck problem of GRE router in the network by border router.
Description of drawings
Fig. 1 is the structural representation of available data service network system;
Fig. 2 is the structural representation of the embodiment one of data service network system of the present invention;
Fig. 3 is the structural representation of the embodiment two of data service network system of the present invention;
Fig. 4 is the flow chart of the embodiment one of the access method of data service of the present invention;
Fig. 5 is the flow chart of the embodiment two of the access method of data service of the present invention.
Embodiment
As shown in Figure 2, the structure chart for data service network system embodiment one of the present invention comprises: a plurality of user domain are provided with in each user domain:
IAD 1, user terminal is connected with IAD by Access Network (AN), and business request information is sent to IAD;
The outer professional gateway 5 of net, the network address translation through NAT is connected with application server by INTERNET;
Re-positioning device 2, be connected with described IAD, comprise a redirection module in this re-positioning device, be used for the outer professional service request data bag of visit net is redirected, generate to be redirected routing iinformation, and will to be redirected routing iinformation and this service request data bag sends to first border router;
Wherein, this described redirection module can be static redirection module, the address information and the address field of predefined user terminal and the corresponding relation of each Service Gateway that are used for the user terminal that carries according to the service request data bag generate and are redirected routing iinformation.
This described redirection module also can be load balancing module, is used for the loading condition according to the outer professional gateway of each net, generates and is redirected routing iinformation;
Described first border router (user side PE) 3, be connected with described re-positioning device, and be connected with a plurality of second border routers by Virtual Private Network, be used for described service request data bag being sent to second border router that described routing iinformation points to according to described redirected routing iinformation;
Described second border router (Service Gateway side PE) 4 is connected with the outer professional gateway of described net, is used for described service request data bag is sent to described Service Gateway.
PSG is used to the user in the corresponding with it user domain that the visit of data service is provided, for the user provides the data service that outer professional both third party SP/CP are provided of visit net, mainly finish the concrete business function of user capture net when outer professional, such as protocol conversion, insert functions such as User Identity, PSG can be a WAP gateway, multi-media SMS service center (Multimedia Messaging service center, be called for short MMSC) etc. equipment, PSG is connected with the IP bearer network by PSG side PE, PSG also is connected with NAT device, and NAT can be the fire compartment wall with network address translation function.SSG is used for providing for the user in different user territory simultaneously the visit of data service, the ability of the data service that professional both operators provide in the visit net is provided for the user, mainly finish the concrete business function when professional in the user capture net, such as functions such as inquiring user identify labels.SSG can be equipment such as streaming media service server and comprehensive instant messaging (Integrated Instantaneous communication is called for short IIC) server, and SSG is connected with the IP bearer network by SSG side PE.
As shown in Figure 3, be data service network system embodiment two of the present invention, comprise:
Comprise: Service Gateway 6 in IAD 1, the outer professional gateway 5 of net, the net;
Redirection module is used for the outer professional service request data bag of visit net is redirected, and generates and is redirected routing iinformation, and will be redirected routing iinformation and this service request data bag sends to first border router; A same embodiment, wherein, this described redirection module can be static redirection module or load balancing module;
Service request identification control module, be connected with described redirection module, be used for the service request data bag is discerned, if described service request data bag is the outer professional service request data bag of visit net, then this packet is sent to the re-orientation processes module, if, then directly be forwarded to described first border router for service data request bag in the net;
Described first border router 3, be connected with described re-positioning device, and be connected with second border router with a plurality of first border routers by Virtual Private Network, be used for to visit the outer professional service request data bag of net and send to second border router of described routing iinformation sensing or the address information of carrying, this service data request bag is sent to described second border router according to professional service data request bag in the visit net according to described redirected routing iinformation;
Described a plurality of second border router 4, is connected with Service Gateway in outer professional gateway of described net and the net respectively, is used for will the outer professional service request data bag of visit net sending to the outer professional gateway of described net, will visit the service request data bag of netting interior business and send to Service Gateway in the described net.
In the present embodiment, also can be SSG and distribute public network IP address, SSG is connected into INTERNET through fire compartment wall, the public network interface of open SSG makes things convenient for third party SP/CP to upload Business Stream.
RPSG does not do any processing to the data flow of visit SSG, but need do redirectedly for the data flow of visit PSG, and the customer traffic that is about to visit PSG is redirected to real PSG for this user's service, thus the load balancing of realization PSG.RPSG can be load equalizer or has the equipment of nat feature.Can perhaps develop equipment by in AG, increasing corresponding function, and itself and AG are used with this function.When realizing, need be that the user in the different address fields stamps different VLAN (Virtual Local Area Network is called for short VLAN) ID in the same user domain at first by this equipment by the equipment that increases nat feature.By the sign of VLAN ID, have address translation feature on the equipment of nat feature according to the strategy that has prepared, just the user in the different address fields can be routed to corresponding PSG respectively, and PSG provides the service of the outer business of visit net for the user thus; When realizing, can realize the load balancing of PSG dynamically, thereby avoid the overweight problem of single PSG load by load equalizer.RPSG is linked to each other with AG, and RPSG is connected to corresponding PE node by drawing modes such as special line or configured tunneling technique encapsulation simultaneously.
The user is divided in each user domain, simultaneously SSG is divided in the SSG territory, distribute the address for each territory, such as under the IPv4 background: UE devices allocation address is in the user domain A: 10.1.X.X; UE devices allocation address is in the user domain B: 10.2.X.X; The devices allocation address is in the SSG territory: 10.100.x.x.PSG is inserted in the IP bearer network, and meanwhile PSG inserts INTERNET through fire compartment wall and NAT, realizes the user data IP bearer network of flowing through, behind the visit PSG, and the application server on NAT visit INTERNET.SSG is connected in the IP bearer network, and is divided in the specific private network network segment.
The IP bearer network is the network of with the form of IP carrying data stream being transmitted specially, PE is positioned at the border of IP bearer network, PE comprises PE, PSG side PE and the SSG side PE of user domain correspondence, the PE of user domain correspondence is the most close user's a equipment in the IP bearer network, and customer traffic is converged and operation such as classification.Make up Virtual Private Network (Virtual Private Network is called for short VPN) in the IP bearer network, VPN and station address can be same establishment system.Can adopt following method to make up VPN:1) all users, SSG and PSG can be divided among the same VPN, because all users this moment are arranged in same VPN,, each user domain must be isolated so for ease of management.Therefore must be in the IP bearer network, the following restriction that shows effect of the branch of routing iinformation: control not intercommunication routing iinformation between each user domain, promptly user's routing iinformation among the user domain A is not declared to user domain B, user's routing iinformation among the user domain B is not declared to user domain A; 2) all users are divided in the different VPN, realize the isolation between the user.For reaching above purpose, we can adopt multiple implementation method, can utilize multi protocol label exchange (Multi-protocol Label Switching such as us, abbreviation MPLS) route target (Route Target in the Virtual Private Network, be called for short RT) and route indication (Route Distinguisher, be called for short RD) attribute, the distribution of routing iinformation between each PE node is controlled.
As shown in Figure 4, be the flow chart of the embodiment one of data service access method of the present invention, it comprises:
Steps A 1, IAD are sent to re-positioning device to the outer professional service request data bag of the visit net that receives:
Steps A 2, described re-positioning device are redirected described service request data bag, generate to be redirected routing iinformation, and will be redirected routing iinformation and this service request data bag sends to first border router; This step can adopt dual mode to realize:
1) static being redirected:, generate and be redirected routing iinformation according to address information and the address field of predefined user terminal and the corresponding relation of each Service Gateway of the user terminal that carries in the service request data bag.
2) dynamic equalization load:, generate and be redirected routing iinformation according to the loading condition of the outer professional gateway of each net:
Steps A 3, described first border router send to second border router that described routing iinformation points to according to described redirected routing iinformation with described service request data bag;
Steps A 4, described second border router send to the outer professional gateway of net with described service request data bag.
After Service Gateway receives the service request data bag offline, the service request from user packet is delivered to NAT, deliver to the outer professional application server (AS) of corresponding net through INTERNET.So far, UE has set up with AS and has been connected.
AS receives the service request from user packet, according to the user profile in this packet, finish user identity, and the inquiry of order relations etc., judge whether the user has this professional authority of visit, and the generation response data packet, even the user has this professional authority of visit, then the direct data traffic flow outside user terminal sends net of service server; If the user does not have this professional authority of visit, then send refuse information to user terminal.
As with response data packet through I.NTERNET delivers to PSG.Carried out operations such as protocol conversion by PSG, send into the IP bearer network, through VPN route in the IP bearer network, deliver to AG, AG sends to user terminal with the response data packet that AS returns.
As shown in Figure 5, be the flow chart of the embodiment two of data service access method of the present invention, it comprises:
Step B1, IAD are sent to re-positioning device to the service request data bag that receives;
Step B2, described re-positioning device are judged described service request data bag, if described service request data bag is the outer professional service request data bag of visit net, execution in step B3 then, otherwise, if described service request data bag is professional service request data bag, then execution in step B6 in the visit net;
Step B3, described service request data bag is redirected, generates and be redirected routing iinformation, and will be redirected routing iinformation and this service request data bag sends to first border router;
A same embodiment, this step also can adopt the static mode that is redirected and the mode of dynamic equalization load to realize;
Step B4, described first border router send to second border router that described routing iinformation points to according to described redirected routing iinformation with described service request data bag;
Step B5, described second border router send to the outer professional gateway of net with described service request data bag:
After Service Gateway receives the service request data bag offline, the service request from user packet is delivered to NAT, deliver to the outer professional application server (AS) of corresponding net through INTERNET.So far, UE has set up with AS and has been connected.
AS receives the service request from user packet, according to the user profile in this packet, finish user identity, and the inquiry of order relations etc., judge whether the user has this professional authority of visit, and the generation response data packet, even the user has this professional authority of visit, then the direct data traffic flow outside user terminal sends net of service server; If the user does not have this professional authority of visit, then send refuse information to user terminal.
AS delivers to PSG with response data packet through INTERNET.By: PSG carries out operations such as protocol conversion, sends into the IP bearer network, through VPN route in the IP bearer network, delivers to AG, and AG sends to user terminal with the response data packet that AS returns.
Step B6, directly this service request data bag is forwarded to described first border router; RPSG is got in this service request data free clothing, can be sent to and first border router through methods such as special line or tunnel encapsulation:
Step B7, described first border router are sent to described second border router according to the address information of carrying in the service data request bag professional in the visit net with this service data request bag;
Step B8, described second border router send to Service Gateway in the net with described service request data bag.
After SSG receives the customer service request data package, according to the information such as IP address in the packet, finish user identity, and the inquiry of order relations etc., judge whether the user has this professional authority of visit, and the generation response data packet, even the user have the visit this professional authority, then SSG directly to the user send the net in data traffic flow; If the user does not have this professional authority of visit, then send refuse information to the user; SSG delivers to AG with response data packet through the IP bearer network; AG sends to UE with the response data packet that AS returns.
Bright at this is among the embodiment, and the user need not through data service in the NAT visit net, and meanwhile, for SSG has opened the public network interface, SP/CP can upload Business Stream; In addition, finish being redirected of packet, make the outer professional gateway load-balancing of net eliminate the performance bottleneck problem of router in the network by RPSG; The user capture net need not when professional outward to have eliminated the performance bottleneck problem of router in the network through router.
Service Gateway was for the user access in the different user territory in embodiments of the invention can also be realized netting, and need not Service Gateway in the net is disposed according to each user domain, solved in the network of a plurality of user domain coexistence the problem that each user domain can't the common business gateway.
It should be noted last that, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although the present invention is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement technical scheme of the present invention, and not break away from the spirit and scope of technical solution of the present invention.
Claims (12)
1. the network system of a data service wherein, comprising: a plurality of user domain, be provided with IAD, the outer professional gateway of net in each user domain, and it is characterized in that, also comprise in each user domain:
Re-positioning device, be connected with described IAD, comprise a redirection module in this re-positioning device, be used for the outer professional service request data bag of visit net is redirected, generate to be redirected routing iinformation, and will to be redirected routing iinformation and this service request data bag sends to first border router;
Described first border router, be connected with described re-positioning device, and be connected with a plurality of second border routers by Virtual Private Network, be used for described service request data bag being sent to second border router that described routing iinformation points to according to described redirected routing iinformation;
Described second border router is connected with the outer professional gateway of described net, is used for described service request data bag is sent to the outer professional gateway of described net.
2. system according to claim 1, it is characterized in that, described redirection module is static redirection module, be used for address information and the address field of predefined user terminal and the corresponding relation of the outer professional gateway of each net of the user terminal that carries according to the service request data bag, generate and be redirected routing iinformation.
3. system according to claim 1 is characterized in that described redirection module is a load balancing module, is used for the loading condition according to the outer professional gateway of each net, generates and is redirected routing iinformation.
4. the network system of a data service comprises: a plurality of user domain, be provided with Service Gateway in IAD, the outer professional gateway of net, the net in each user domain, and it is characterized in that, also comprise in each user domain:
Re-positioning device is connected with described IAD, comprises in this re-positioning device:
Redirection module is used for the outer professional service request data bag of visit net is redirected, and generates and is redirected routing iinformation, and will be redirected routing iinformation and this service request data bag sends to first border router;
Service request identification control module, be connected with described redirection module, be used for the service request data bag is discerned, if described service request data bag is the outer professional service request data bag of visit net, then this packet is sent to redirection module, if, then directly be forwarded to described first border router for professional service request data bag in the visit net;
Described first border router, be connected with described re-positioning device, and be connected with second border router with a plurality of first border routers by Virtual Private Network, be used for to visit the outer professional service request data bag of net and send to second border router of described routing iinformation sensing or the address information of carrying, this service request data bag is sent to described second border router according to professional service request data bag in the visit net according to described redirected routing iinformation;
Described a plurality of second border router, is connected with Service Gateway in outer professional gateway of described net and the net respectively, is used for will the outer professional service request data bag of visit net sending to the outer professional gateway of described net, will visit the service request data bag of netting interior business and send to Service Gateway in the described net.
5. system according to claim 4, it is characterized in that, described redirection module is static redirection module, be used for address information and the address field of predefined user terminal and the corresponding relation of the outer professional gateway of each net of the user terminal that carries according to the service request data bag, generate and be redirected routing iinformation.
6. system according to claim 4 is characterized in that described redirection module is a load balancing module, is used for the loading condition according to the outer professional gateway of each net, generates and is redirected routing iinformation.
7. the access method of a data service is characterized in that, comprises the steps:
IAD is sent to re-positioning device to the outer professional service request data bag of the visit net that receives:
Described re-positioning device is redirected described service request data bag, generate to be redirected routing iinformation, and will be redirected routing iinformation and this service request data bag sends to first border router;
Described first border router sends to second border router that described routing iinformation points to according to described redirected routing iinformation with described service request data bag;
Described second border router sends to the outer professional gateway of net with described service request data bag.
8. method according to claim 7, it is characterized in that, described re-positioning device is redirected described service request data bag, generating redirected routing iinformation is specially: address information and the address field of predefined user terminal and the corresponding relation of the outer professional gateway of each net according to the user terminal that carries in the service request data bag generate and are redirected routing iinformation.
9. method according to claim 7 is characterized in that, described re-positioning device is redirected described service request data bag, generates redirected routing iinformation and is specially: according to the loading condition of the outer professional gateway of each net, generate and be redirected routing iinformation.
10. the access method of a data service is characterized in that, comprises the steps:
IAD is sent to re-positioning device to the service request data bag that receives;
Described re-positioning device is judged described service request data bag, if described service request data bag is the outer professional service request data bag of visit net, then described service request data bag is redirected, generate to be redirected routing iinformation, and will to be redirected routing iinformation and this service request data bag sends to first border router; Described first border router sends to second border router that described routing iinformation points to according to described redirected routing iinformation with described service request data bag; Described second border router sends to the outer professional gateway of net with described service request data bag;
If described service request data bag directly is forwarded to described first border router for professional service request data bag in the visit net; Described first border router is sent to described second border router according to the address information of carrying in the service request data bag professional in the visit net with this service request data bag; Described second border router sends to Service Gateway in the net with described service request data bag.
11. method according to claim 10, it is characterized in that, described re-positioning device is redirected described service request data bag, generating redirected routing iinformation is specially: address information and the address field of predefined user terminal and the corresponding relation of the outer professional gateway of each net according to the user terminal that carries in the service request data bag generate and are redirected routing iinformation.
12. method according to claim 10, it is characterized in that, described re-positioning device is redirected described service request data bag, generates redirected routing iinformation and is specially: according to the loading condition of the outer professional gateway of each net, generate and be redirected routing iinformation.
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