CN100337444C - A method for redirecting packet data gateway in wireless LAN - Google Patents

A method for redirecting packet data gateway in wireless LAN Download PDF

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Publication number
CN100337444C
CN100337444C CNB2003101230977A CN200310123097A CN100337444C CN 100337444 C CN100337444 C CN 100337444C CN B2003101230977 A CNB2003101230977 A CN B2003101230977A CN 200310123097 A CN200310123097 A CN 200310123097A CN 100337444 C CN100337444 C CN 100337444C
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pdg
user terminal
application
service
place
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CN1633090A (en
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张文林
黄迎新
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SnapTrack Inc
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Huawei Technologies Co Ltd
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Priority to CNB2003101230977A priority Critical patent/CN100337444C/en
Priority to PCT/CN2004/001214 priority patent/WO2005062631A1/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/40—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass for recovering from a failure of a protocol instance or entity, e.g. service redundancy protocols, protocol state redundancy or protocol service redirection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/17—Selecting a data network PoA [Point of Attachment]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/01—Protocols
    • H04L67/10—Protocols in which an application is distributed across nodes in the network
    • H04L67/1001—Protocols in which an application is distributed across nodes in the network for accessing one among a plurality of replicated servers

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  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The present invention provides a method for redirecting a packet data gateway (PDG) in a wireless LAN. With the present invention, when a user terminal fails to access the PDG, the PDG receiving the request of the user terminal returns failure information containing the IP address of a PDG capable of serving the requesting user to the user terminal. After receiving the information, the user terminal is redirected via the IP address provided by the information so as to require a new PDG to establish a tunnel connection. Thus, the user terminal can be directly redirected to an available PDG so as to avoid the process that the user terminal is redirected on a DNS to select the PDG in a home network. Meanwhile, with the present invention, the user terminal can definitely know which PDG is available so as to reduce the time of connection failure and optimize the application of network resources.

Description

The method at redirected packets data critical point in a kind of WLAN (wireless local area network)
Technical field
The present invention relates to the wireless access technology field, be meant the method at redirected packets data critical point (PDG) in a kind of WLAN (wireless local area network) especially.
Background technology
Along with the development of society, the user is more and more higher to the requirement of wireless access rate, because WLAN (wireless local area network) (WLAN, Wireless Local Area Network) can provide wireless data access at a high speed in more among a small circle, thereby it is widely used.WLAN (wireless local area network) comprises multiple different technologies, a widely used technical standard is IEEE 802.11b at present, it adopts the 2.4GHz frequency range, the maximum data transmission rate can reach 11Mbps, use the IEEE 802.11g and bluetooth (Bluetooth) technology in addition of this frequency range, wherein, 802.11g the maximum data transmission rate can reach 54Mbps.Other wireless local area network technology all uses the 5GHz frequency range such as IEEE 802.11a and ETSI BRAN Hiperlan2, and maximum transmission rate also can reach 54Mbps.
Though multiple different WLAN wireless access technology is arranged, most of WLAN adopts Internet Protocol (IP) packet data package to carry out transfer of data.For a Wireless IP network, the concrete WLAN access technology that it adopted generally is transparent for upper strata IP, its basic structure all is to utilize access point (AP) to finish the wireless access of user terminal, and the IP transmission network of forming by network control and connection device carries out transfer of data.
Rise and development along with the WLAN technology, WLAN and various wireless mobile communication network, such as: the intercommunication of global mobile communication (GSM) system, code division multiple access (CDMA) system, Wideband Code Division Multiple Access (WCDMA) (WCDMA) system, time division duplex-S-CDMA (TD-SCDMA) system, CDMA2000 system is just becoming the emphasis of current research.In third generation partner program (3GPP) standardization body, user terminal both can link to each other with internet (Internet), Intranet (Intranet) by the access network of WLAN, can also link to each other with the home network of 3GPP system or the accesses network of 3GPP system via the WLAN access network.
Figure 1 shows that the networking structure schematic diagram of wlan system and the intercommunication of 3GPP system under the roaming condition.When the WLAN user terminal inserts in roaming, link to each other with the accesses network of 3GPP via the WLAN access network, since the part entity in the 3GPP accesses network respectively with the 3GPP home network in the corresponding entity interconnection, such as 3GPP authentication and authorization charging (AAA) agency in the 3GPP accesses network and 3GPP authentication and authorization charging (AAA) server in the 3GPP home network; WLAN (wireless local area network) in the 3GPP accesses network inserts packet data gateway (PDG, Packet Data Gateway) in critical point (WAG) and the 3GPP home network or the like, therefore, has realized that the WLAN user terminal inserts the home network of 3GPP.Dash area is 3GPP packet switching (PS) territory business among the figure, i.e. intercommunication scene 3 (Scenario3) business in the 3GPP network.
Figure 2 shows that the networking structure schematic diagram of wlan system and the intercommunication of 3GPP system under the non-roaming situation.When the WLAN user terminal inserts in this locality, directly link to each other with the home network of 3GPP via the WLAN access network.Dash area is 3GPP packet switching (PS) territory business, i.e. Scenario3 business in the 3GPP home network among the figure.
Referring to Fig. 1, shown in Figure 2, in the 3GPP system, mainly comprise home signature user server (HSS)/attaching position register (HLR), 3GPP aaa server, 3GPP AAA agency, WAG, packet data gateway, charging critical point (CGw)/charging information collecting system (CCF) and Online Charging System (OCS).All entities of user terminal, WLAN access network and 3GPP system have constituted the 3GPP-WLAN Internet jointly, and this 3GPP-WLAN Internet can be used as a kind of LAN service system.Wherein, the 3GPP aaa server is responsible for authentication, mandate and the charging to the user, and the charging information collecting that the WLAN access network is sent here also sends charge system to; Packet data gateway (PDG) is responsible for user data is transferred to 3GPP network or other packet networks from the WLAN access network; Charge system mainly receives and writes down the customer charging information that network transmits, and OCS transmits online cost information according to online charging user's expense situation indication network is periodic, and adds up and control.
Under non-roaming situation, when the WLAN user terminal wishes directly to insert Internet/Intranet, user terminal directly is linked into Internet/Intranet by the WLAN Access Network after finishing the access authentication mandate by WLAN Access Network and aaa server (AS).If this WLAN user terminal also wishes to insert 3GPP packet switching (PS) territory business, then can be further to 3GPP home network application Scenario3 business.The method of application Scenario3 business is:
The WLAN user terminal at first provides to a public domain name resolution server (DNS) oneself needs professional Service Access point title (W-APN) sign, this DNS can be a third-party common equipment, also can be the common domain name analyzing device of wireless network special use, the IP address that the W-APN identification (RNC-ID) analytic that the DNS that accepts applications provides according to the user goes out corresponding one or more PDG returns to the WLAN terminal use.The WLAN terminal use uses from one of them IP address that DNS obtains, set up the tunnel connection requests to the PDG transmission corresponding with this IP address, the PDG and the AS that receive the user terminal connection request get in touch, by AS be responsible for to the business identity of user terminal check, work such as mandate, if access authentication success, then this PDG that receives the user terminal connection request sets up the tunnel with the WLAN terminal use who sends request and is connected, thereby realizes application Scenario3 business.If access authentication is unsuccessful, this PDG that accepts the user terminal connection request will notify the WLAN user terminal.
Under roaming condition, when the WLAN user terminal wishes to insert Internet/Intranet, user terminal is linked into Internet/Intranet by the 3GPP accesses network to the application of 3GPP home network, and access authentication can directly be linked into Internet/Intranet by the WLAN Access Network by the back user terminal.If user terminal also wishes to apply for the Scenario3 business, its application method is:
The WLAN user terminal at first provides to a public DNS oneself needs professional W-APN sign, and the IP address that the W-APN identification (RNC-ID) analytic that this DNS that accepts applications provides according to the user goes out corresponding one or more PDG returns to the WLAN terminal use.The WLAN terminal use uses from one of them IP address that DNS obtains, set up the tunnel connection requests to the PDG transmission corresponding with this IP address, receiving the PDG of user terminal connection request and the AS of present networks gets in touch, get in touch by the AS of present networks and the AS of WLAN user terminal place home network, AS by WLAN user terminal place home network is responsible for the business identity of user terminal is checked, work such as mandate, if access authentication success, then this PDG that accepts the user terminal connection request sets up the tunnel with the WLAN terminal use who sends request and is connected, thereby realize using the Scenario3 business, if access authentication is unsuccessful, this PDG that accepts the user terminal connection request will notify the WLAN user terminal.
After the WLAN user terminal receives unsuccessful notice from PDG, to get in touch with DNS again, request DNS is at waiting to apply for professional IP address of resolving PDG in home network, identify according to the W-APN that the user provides by DNS, the IP address of one or more PDG that from the home network of this user terminal, parse, and return to user terminal, the WLAN terminal use reuses one of them the IP address that obtains from DNS, set up the tunnel connection requests to the PDG transmission corresponding with this IP address, receiving the PDG of user terminal connection request and the AS of present networks gets in touch, get in touch by the AS of present networks and the AS of WLAN user terminal place home network, finish by the AS of WLAN user terminal place home network the business identity of user terminal is checked, after the work such as mandate, this PDG that accepts the user terminal connection request sets up the tunnel with the WLAN terminal use who sends request and is connected, thereby realizes using the Scenario3 business.
The defective of said method is: when the WLAN terminal use wishes to use certain PGD of accesses network under roaming state, if PDG notice WLAN user terminal is unsuccessful, the WLAN user terminal can be wanted the IP address of access service at the PDG of home network with the DNS contact to resolve again.The WLAN user terminal needs to get in touch with DNS once more in this case, has caused the waste of unnecessary signal resource, makes the use of resource not reach optimization.
Summary of the invention
In view of this, the object of the present invention is to provide the method at redirected packets data critical point in a kind of WLAN (wireless local area network), when user terminal inserts the PDG failure, make the user can directly be redirected to the PDG that service can be provided, thereby avoid getting in touch once more the process of DNS.
For achieving the above object, technical scheme of the present invention is achieved in that
The method at redirected packets data critical point in a kind of WLAN (wireless local area network), when fail in user terminal accessing group data critical point (PDG), this method may further comprise the steps:
A, the PDG that receives the user terminal application obtain the information that the IP address, PDG place of service can be provided for the application user, and return the failed message that comprises the information of obtaining to this application served user terminals;
After b, user terminal received the described message of step a, be redirected the IP address that using this message provides, and sets up the tunnel to new PDG request and connect.
Preferably, if owing to receive that the PDG of user terminal application can not provide service, and make the user terminal access failure, the described PDG of user terminal application that receives of step a obtains and can provide the method for the PDG place IP address information of service to be for the application user:
This PDG obtains the PDG place IP address information that service can be provided for the application user terminal from the alternative information of self preserving.
Preferably, if owing to receive that the PDG of user terminal application can not provide service, and make the user terminal access failure, then the described PDG of user terminal application that receives of step a obtains and can provide the method for the PDG place IP address information of service to be for the application user:
This PDG is the aaa server in the home network of user terminal place directly, or to acting on behalf of aaa server, or by acting on behalf of the PDG place IP address information that the aaa server of aaa server in the home network of user terminal place inquired about can provide service for the application user terminal.
Preferably, if owing to receive that the PDG of user terminal application can not provide service, and make the user terminal access failure, then the described PDG of user terminal application that receives of step a obtains and can provide the method for the PDG place IP address information of service to be for the application user:
This PDG is by carrying out WLAN subscriber terminal authority authorization flow, and inquiry can provide the PDG place IP address information of service for the application user terminal.
Preferably, if because the aaa server in the home network of user terminal place disagrees with that this user uses the PDG of its application, and make the user terminal access failure, then the described PDG of user terminal application that receives of step a obtains and can provide the method for the PDG place IP address information of service to be for the application user:
Aaa server in this user terminal place home network is reassigned a PDG that service can be provided, and the IP address information of this PDG is offered the PDG that receives the user terminal application.
Preferably, if disagree with that this user uses the PDG of its application owing to act on behalf of aaa server, and make the user terminal access failure, then the described PDG of user terminal application that receives of step a obtains and can provide the method for the PDG place IP address information of service to be for the application user:
This is acted on behalf of aaa server and reassigns a PDG that service can be provided, and the IP address information of this PDG is offered the PDG that receives the user terminal application.
Preferably, described PDG returns the failed message that comprises the information of obtaining for this user terminal, sets up agreement L2TP carrying by layer 2 tunnel.
Use the present invention, when user terminal inserts the PDG failure, the PDG that receives the user terminal application returns to user terminal and comprises the failed message that the IP address, PDG place of service can be provided for the application user, after user terminal receives this message, be redirected the IP address that using this message provides, and sets up the tunnel to new PDG request and connect.Thereby make user terminal can directly be redirected to the PDG that service can be provided, avoided user terminal to be redirected to the process that home network is selected PDG to DNS.Simultaneously, use the present invention and make user terminal can know clearly which PDG can provide service, thereby reduced the number of times of connection failure, optimized the application of Internet resources.
Description of drawings
Figure 1 shows that the networking structure schematic diagram of wlan system and the intercommunication of 3GPP system under the roaming condition;
Figure 2 shows that the networking structure schematic diagram of wlan system and the intercommunication of 3GPP system under the non-roaming situation;
Figure 3 shows that and use the flow chart that user terminal of the present invention is redirected PDG.
Embodiment
For making technical scheme of the present invention clearer, again the present invention is described in further details below in conjunction with drawings and the specific embodiments.
Thinking of the present invention is: when user terminal inserts the PDG failure, the PDG that receives the user terminal application obtains the information that the IP address, PDG place of service can be provided for the application user, and returns the failed message that comprises the information of obtaining to this application served user terminals; Be redirected the IP address that user terminal is used this message to be provided, and sets up the tunnel to new PDG request and connect.
Figure 3 shows that and use the flow chart that user terminal of the present invention is redirected PDG.
Step 1 during the WLAN accessing user terminal to network, at first will be passed through basic access authentication licensing process, and the WLAN terminal use can directly visit Internet/Intranet by access network after this process;
Step 2, when this WLAN user terminal is wished certain business in 3GPP PS territory in the application access network, this WLAN user terminal at first provides to a public DNS oneself needs professional W-APN sign, this DNS that accepts applications returns the IP address of one or more PDG for the WLAN terminal use through after resolving;
Step 3, WLAN user terminal are used from one of them IP address that DNS obtains, and send to the PDG corresponding with this IP address and set up the tunnel connection requests;
If when the WLAN user terminal is not received any response message from the PDG of application in the time that limits, as being the PDG deadlock, the WLAN user terminal can be selected the IP address by other PDG of dns resolution, and sets up the tunnel connection requests to this selected IP address transmission;
Step 4 receives WLAN user terminal connection request PDG and judges whether self can provide service, if self can not provide user terminal required service, may be that then execution in step 5 because of reasons such as out of service or flow controls, otherwise execution in step 7;
Step 5, whether receive WLAN user terminal connection request PDG judges self to have the IP address that substitutes the PDG that service is provided oneself can be provided, if have, directly return then that comprise can be for after the application user provides the failed message of IP address, PDG place of service to user terminal, execution in step 9, otherwise execution in step 6;
Step 6, the PDG that receives WLAN user terminal connection request is to the local agent aaa server, perhaps, the aaa server of aaa server in the home network of WLAN user terminal place of acting on behalf of by this locality inquired about, perhaps, directly the aaa server in the home network of WLAN user terminal place is inquired about, and can serve as the information that the application user provides the IP address, PDG place of service to obtain, and execution in step 8;
In addition, the PDG that receives WLAN user terminal connection request also can obtain the information that the IP address, PDG place of service can be provided for the application user by carrying out WLAN subscriber terminal authority authorization flow, and execution in step 8;
Step 7 receives WLAN user terminal connection request PDG request and is connected with aaa server in the home network of WLAN user terminal place, so that the WLAN user terminal is carried out Certificate Authority, if by authenticating then execution in step 10;
If the aaa server of home network does not allow the WLAN user terminal to use this PDG, then the aaa server of home network provides an IP address information that the PDG of service can be provided, and after sending information to PDG, execution in step 8, the IP address information that aaa server provided of home network generally also is in home network usually;
If the aaa server of acting on behalf of of accesses network does not allow WLAN user to use this PDG, then the aaa server of acting on behalf of of accesses network provides an IP address information that the PDG of service can be provided, and after sending information to PDG, execution in step 8;
Step 8, this receives WLAN user terminal connection request PDG and returns to user terminal and comprise and can provide the failed message of the IP address, PDG place of service for the application user;
Step 9 receives the WLAN user terminal of failed message, the IP address that obtains providing in the message, and send to the pairing PDG in this IP address in the execution in step 3 and set up the tunnel connection requests;
Step 10, this receives the tunnel that WLAN user terminal connection request PDG and WLAN user terminal are set up service communication, and provides institute's requested service to the user.
Above-mentioned message process can be used existing IP---and layer 2 tunnel are set up agreement (L2TP) and are finished.Returning in the failed message form of L2TP, there is information (message) field, this message field can insert various information as required, in the present invention, can provide the IP address information of service PDG to put into this field.
When the L2TP protocol application inserts the agreement of PDG for the WLAN user terminal, the WLAN user terminal is after receiving failed message, in judging message, existing object code (result code) and error code (error code) field, also to further judge the information of message field.
When the L2TP agreement is used on the Internet, some specific " result code " back may not have " error code " or " message " field, but after being applied to the WLAN Radio Access Network, just require it must carry in " result code " and " error code " back " message ", to adapt to the special applications of wireless network.
IP IP Security security protocol family also can be used as tunnel protocol in addition, Internet IKE (IKE wherein, Internet Key Exchange), also can be used as bearing protocol of the present invention, directly use reserved field wherein or do the function that suitable expansion just can be finished this programme.
The GRE of Internet (Generic Routing Encapsulation), it is a kind of tunneling of supporting the tunnel, IP address information of the present invention can be placed in the IP bag and directly be encapsulated in the GRE agreement then, realize the tunnel communication of WLAN user terminal and PDG, for provide reasonable fail safe GRE agreement preferably and IP Security agreement be used.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being made, is equal to and replaces and improve, and all should be included within protection scope of the present invention.

Claims (7)

1, the method at redirected packets data critical point in a kind of WLAN (wireless local area network) when fail in user terminal accessing group data critical point (PDG), is characterized in that this method may further comprise the steps:
A, the PDG that receives the user terminal application obtain the information that the IP address, PDG place of service can be provided for the application user, and return the failed message that comprises the information of obtaining to this application served user terminals;
After b, user terminal received the described message of step a, be redirected the IP address that using this message provides, and sets up the tunnel to new PDG request and connect.
2, method according to claim 1, it is characterized in that, if owing to receive that the PDG of user terminal application can not provide service, and make the user terminal access failure, the described PDG of user terminal application that receives of step a obtains and can provide the method for the PDG place IP address information of service to be for the application user:
This PDG obtains the PDG place IP address information that service can be provided for the application user terminal from the alternative information of self preserving.
3, method according to claim 1, it is characterized in that, if owing to receive that the PDG of user terminal application can not provide service, and make the user terminal access failure, then the described PDG of user terminal application that receives of step a obtains and can provide the method for the PDG place IP address information of service to be for the application user:
This PDG is the aaa server in the home network of user terminal place directly, or to acting on behalf of aaa server, or by acting on behalf of the PDG place IP address information that the aaa server of aaa server in the home network of user terminal place inquired about can provide service for the application user terminal.
4, method according to claim 1, it is characterized in that, if owing to receive that the PDG of user terminal application can not provide service, and make the user terminal access failure, then the described PDG of user terminal application that receives of step a obtains and can provide the method for the PDG place IP address information of service to be for the application user:
This PDG is by carrying out WLAN subscriber terminal authority authorization flow, and inquiry can provide the PDG place IP address information of service for the application user terminal.
5, method according to claim 1, it is characterized in that, if because the aaa server in the home network of user terminal place disagrees with that this user uses the PDG of its application, and make the user terminal access failure, then the described PDG of user terminal application that receives of step a obtains and can provide the method for the PDG place IP address information of service to be for the application user:
Aaa server in this user terminal place home network is reassigned a PDG that service can be provided, and the IP address information of this PDG is offered the PDG that receives the user terminal application.
6, method according to claim 1, it is characterized in that, if disagree with that this user uses the PDG of its application owing to act on behalf of aaa server, and make the user terminal access failure, then the described PDG of user terminal application that receives of step a obtains and can provide the method for the PDG place IP address information of service to be for the application user:
This is acted on behalf of aaa server and reassigns a PDG that service can be provided, and the IP address information of this PDG is offered the PDG that receives the user terminal application.
7, method according to claim 1 is characterized in that, described PDG returns the failed message that comprises the information of obtaining for this user terminal, sets up agreement L2TP carrying by layer 2 tunnel.
CNB2003101230977A 2003-12-24 2003-12-24 A method for redirecting packet data gateway in wireless LAN Expired - Fee Related CN100337444C (en)

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CNB2003101230977A CN100337444C (en) 2003-12-24 2003-12-24 A method for redirecting packet data gateway in wireless LAN
PCT/CN2004/001214 WO2005062631A1 (en) 2003-12-24 2004-10-26 Method of redirecting packet data gateway in wireless local area network

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