CN1642121A - Method for obtaining packet data gate information by user terminal for wireless LAN - Google Patents

Method for obtaining packet data gate information by user terminal for wireless LAN Download PDF

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Publication number
CN1642121A
CN1642121A CN200410000429.7A CN200410000429A CN1642121A CN 1642121 A CN1642121 A CN 1642121A CN 200410000429 A CN200410000429 A CN 200410000429A CN 1642121 A CN1642121 A CN 1642121A
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Prior art keywords
pdg
user terminal
business
information
self
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CN200410000429.7A
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CN100387010C (en
Inventor
张文林
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Priority to CNB2004100004297A priority Critical patent/CN100387010C/en
Priority to PCT/CN2005/000077 priority patent/WO2005074193A1/en
Publication of CN1642121A publication Critical patent/CN1642121A/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/54—Store-and-forward switching systems 
    • H04L12/56—Packet switching systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L61/00—Network arrangements, protocols or services for addressing or naming
    • H04L61/45—Network directories; Name-to-address mapping
    • H04L61/4541—Directories for service discovery
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/10—Small scale networks; Flat hierarchical networks
    • H04W84/12—WLAN [Wireless Local Area Networks]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/16—Gateway arrangements

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

Abstract

The invention provides a method for user terminal in wireless local-area network to obtain packet data gateway information, making the user terminal obtain PDG-supported service information in the course that the user terminal establishes tunnel linkage with the PDG, and correspondingly storing the PDG-supported service information and the PDG address. As the user terminal accesses to PS domain again, it firstly judges if there is PDG address corresponding to access service to be applied for in the local place: if yes, directly sends a tunnel-establishing request to the PDG, thus reducing the process of DNS resolution of a user, optimizing system flow and saving network resources. It is simple to implement and has good compatibility with existing related techniques.

Description

User terminal obtains the method for packet data gateway information in the WLAN (wireless local area network)
Technical field
The present invention relates to the wireless access technology field, be meant that especially user terminal in a kind of WLAN (wireless local area network) obtains the method for packet data gateway (PDG) information.
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) 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 to insert Internet/Intranet, carry out the access authentication mandate by WLAN Access Network and aaa server (AS), after the Certificate Authority success, can directly be linked into Internet/Intranet by the WLAN Access Network.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 is selected constructed Service Access point title W-APN sign according to customer service, obtain the IP address of one or more packet data gateway PDG through DNS, therefrom select an IP address, send to the PDG of this IP address correspondence and set up the tunnel connection requests; The PDG and the AS that receive the user terminal connection request get in touch, and after the AS authentication and authorization, WLAN user terminal and this PDG set up the tunnel, use the service that this PDG provides.
When WLAN user need use another business in PS territory, promptly to use different W-APN and identify when inserting the PS territory, the WLAN user terminal need repeat the process of dns resolution, provides the PDG of this service the address to obtain, and carries out this business thereby set up the tunnel.
Under roaming condition, when the WLAN user terminal wishes to insert Internet/Intranet, at first accept the authentication of AS in the 3GPP home network by the 3GPP accesses network, after access authentication passed through, this WLAN user terminal directly was linked into Internet/Intranet by the WLAN Access Network.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 is selected constructed Service Access point title W-APN sign according to customer service, obtain the IP address of one or more packet data gateway PDG through DNS, therefrom select an IP address, send to the PDG of this IP address correspondence and set up the tunnel connection requests; 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, after the AS of home network authentication and authorization, WLAN user terminal and this PDG set up the tunnel, use the service that this PDG provides.
When WLAN user needs another business in applications exchange (PS) territory, when promptly using different W-APN signs and inserting the PS territory, the WLAN user terminal need repeat the process of dns resolution, provides the PDG of this service the address to obtain, and carries out this business thereby set up the tunnel.
The defective of said method is: even second business that certain user applies inserts and first business of application access are the services that identical PDG provides, the WLAN user terminal needs to resolve to DNS too, make the flow process of user terminal application access service optimize inadequately like this, and cause network resources waste.
Summary of the invention
In view of this, the object of the present invention is to provide user terminal in a kind of WLAN (wireless local area network) to obtain the method for PDG information, when the user terminal application inserts certain PDG, can obtain the business information that this PDG supports simultaneously.
For achieving the above object, technical scheme of the present invention is achieved in that
User terminal obtains the method for packet data gateway information in a kind of WLAN (wireless local area network), and this method may further comprise the steps:
If PDG self preserves the information of order business of user terminal, and after this PDG receives successful authorization messages from aaa server, that support and business information that this application access user terminal has been ordered returns to user terminal with self, and user terminal is preserved the information from PDG;
If PDG self does not have the information of order business of user terminal, and after this PDG receives successful authorization messages from aaa server, this PDG judges the information that whether includes the user terminal order business in the authorization messages that receives, if, then that support and business information that this application access user terminal has been ordered returns to user terminal with self, and user terminal is preserved the information from PDG; Otherwise, all business information of self supporting are returned to user terminal, user terminal is preserved the information from PDG, or handles according to old process, and process ends;
If PDG receives the message that can not authorize from the authentification failure of aaa server, then direct process ends.
Preferably, if PDG self does not have the information of order business of user terminal, and after the aaa server authentication success, before the authorization messages that returns success to PDG, further comprise: judge from the information that whether comprises request user terminal order business in the authentication request message of PDG, if do not comprise, do not insert the information of user subscribes service in the successful authorization messages that then returns yet, if comprise, then pre-configured according to system, in the authorization messages of the success of returning, insert the information of user terminal order business, perhaps, in the successful authorization messages that returns, do not insert the information of user subscribes service.
Preferably, if PDG self preserves the information of order business of user terminal, the business information that all business information that described self support and business information that this application access user terminal has been ordered is PDG to be supported by comparison self and the user terminal of self preserving have been ordered is determined;
If PDG self does not have the information of order business of user terminal, the business information that all business information that described self support and business information that this application access user terminal has been ordered is PDG to be supported by comparison self and the user terminal in the authorization messages have been ordered is determined.
Preferably, if PDG self is supported and this application insert the business information that the user ordered and send to user terminal, then user terminal is preserved the Business Name self ordered and this PDG supports and the corresponding relation of this PDG address; If PDG sends to user terminal with all business information of self supporting, then user terminal is preserved from all Business Names of PDG and the corresponding relation of this PDG address, perhaps, user terminal will compare from all Business Names of PDG and self order business title, after determining that support and the Business Name that self has ordered of this PDG, preserve that self has ordered again and the Business Name that this PDG supports and the corresponding relation of this PDG address.
Preferably, this method further comprises: preestablish the holding time of corresponding relation, after corresponding relation that the WLAN user terminal is preserved exceeded the predefined holding time, this corresponding relation was deleted automatically.
Preferably, this method further comprises: after the WLAN user terminal has used certain corresponding relation of having preserved, reinitialize the holding time of this corresponding relation.
Preferably, the length of described holding time is the default value of user terminal, or is set by the user.
Preferably, this method further comprises: when certain business is used in user terminal access PS territory, at first judge and self whether preserve the pairing PDG of this business address, if have, then directly send request and insert message to this PDG, and after by PDG this request message being forwarded to aaa server, continue to carry out subsequent step, otherwise, this user terminal is selected IP address from the IP address that dns resolution goes out, send request to the pairing PDG in this selected IP address again and insert message, and after by PDG this request message being forwarded to aaa server, continue to carry out subsequent step.
Preferably, described user terminal order business information is identified by WLAN (wireless local area network) service access roll-call W-APN.
The invention enables user terminal utilization and PDG to set up the process in tunnel, obtained the business information that this PDG supports simultaneously, and the business information that this PDG supports is carried out corresponding preservation with this PDG address.When user terminal inserts the PS territory once more, at first judge the local PDG address that whether remains to be applied for the access service correspondence,, reduced the user and arrived the process of dns resolution if having then directly send the request of setting up the tunnel to this PDG, optimize system flow, saved Internet resources.The present invention realizes simply, and with prior art good compatibility is arranged.
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 the flow chart of using the embodiment of the invention one;
Figure 4 shows that the flow chart of using the embodiment of the invention two.
Embodiment
For making technical scheme of the present invention clearer, the present invention is described in further detail again below in conjunction with drawings and the specific embodiments.
Thinking of the present invention is: after PDG received and inserts message from the request of user terminal, the aaa server under this user terminal in the home network sent request authentication message, carries out authentication by aaa server; After PDG received the aaa server authorization messages, the business information that self is supported sent to user terminal, thereby made user terminal obtain business information from PDG.
Figure 3 shows that the flow chart of using the embodiment of the invention one.WLAN user terminal in the present embodiment has been ordered generic web page browse service, IP Multimedia System (IMS) business and game service, and system allows the aaa server in the home network under this user terminal the order business information of user terminal to be sent to the PDG of its authentication of request.
Step 301, the WLAN user terminal is finished the access authentication mandate by WLAN Access Network and aaa server; Preserve this user's order business information, the information of promptly having preserved the generic web page browse service that this user has ordered, IMS business and game service at aaa server;
Step 302 inserts the packet switch domain service of 3GPP first at the WLAN user terminal, and the request dns resolution can provide institute apply for the IP address of the PDG that serves, selectes an IP address then from the IP address that is obtained;
In the present embodiment, when the user need apply for the generic web page browse service, then ask dns resolution that the IP address of the PDG of generic web page browse service can be provided, from the one or more IP address that obtains, select an IP address then;
Step 303, WLAN user terminal are sent to the PDG of selected IP address correspondence and are set up the tunnel connection requests; In the present embodiment, suppose that the selected PDG of WLAN user terminal supports generic web page browse service, IMS business and electronic commerce affair;
Step 304, after PDG receives request from the user, when the order business information of this user terminal was not preserved in definite this locality, then the aaa server of home network sent the request that comprises the authentication of asking this user terminal order business information under this user;
Step 305, aaa server weight discriminating and key agreement protocol (AKA) agreement and WLAN user recognize each other card, if authentication success, then execution in step 306, otherwise a new PDG address is sent to user terminal, and process ends;
Step 306, aaa server send successful authorization message to PDG, comprise the user terminal information of order business in this authorization message simultaneously, promptly notify this user of PDG to order the title of generic web page browse service, IMS business and game service;
Step 307, after PDG receives the described authorization message of step 306, Business Name that the user has been ordered and the Business Name that self can support compare, thereby determine self support and business information that the user has ordered, in the present embodiment, PDG determines that through relatively generic web page browse service and IMS business are self support and business information that the user has ordered;
Step 308, PDG sends the response message of setting up the tunnel for the WLAN user terminal, comprise support and the business information that the user has ordered of PDG self in this message, promptly comprise the title of generic web page browse service and IMS business, Business Name is identified by WLAN (wireless local area network) service access roll-call W-APN;
Step 309 after the WLAN user terminal receives above-mentioned response message, is preserved the Business Name in this response message and the corresponding relation of this PDG address, promptly preserves the title of generic web page browse service and IMS business and the corresponding relation of this PDG address;
Wherein, the time span of being preserved can be set by the user, and also can adopt the default time of WLAN user terminal, and, in case after the WLAN user terminal has used certain corresponding relation of having preserved, the holding time of this corresponding relation will upgrade, and promptly reinitialize the holding time of this corresponding relation; If the corresponding relation that the WLAN user terminal is preserved never was used in the predefined holding time, then after exceeding the holding time, this corresponding relation will be deleted automatically;
Step 310, PDG and this WLAN user terminal are set up the tunnel, carry out the business of its application, and promptly PDG provides the service of generic web page browse service for it.
In the above-described embodiments, after PDG receives request from the user, if when determining that the order business information of this user terminal is not preserved in this locality, also can under this user, send the request that does not comprise the authentication of asking this user terminal order business information by the aaa server of home network; After this PDG receives authorization messages from the success of aaa server, collocation strategy according to itself is inserted into whole business information of self supporting in the message of setting up the tunnel, and send the response message that this sets up the tunnel to user terminal, promptly comprise the title of generic web page browse service, IMS business and electronic commerce affair in this message; Perhaps, this PDG also can not send the business information that self supports, promptly handles according to existing procedure.
In the above-described embodiments, after PDG receives request from the user, if determine self to preserve this user terminal information of ordering services, then the aaa server of home network sends the request that does not comprise the authentication of asking this user terminal order business information under this user, if authentication success, the user that this PDG preserves oneself order business title compares with the Business Name that self can support, thereby determine self support and business information that the user has ordered, and this information inserted return to the setting up in the message in the tunnel response message of user, in the present embodiment, PDG determines that through relatively generic web page browse service and IMS business are self support and business information that the user has ordered; If authentification failure, this PDG sends to user terminal with a new PDG address, and process ends.
In that WLAN user is non-when inserting the PS territory first, at first judge the local PDG address that whether remains to be applied for the access service correspondence,, then directly send the request of setting up the tunnel to this PDG if having, otherwise after dns resolution, send the request of setting up the tunnel to selected PDG more again; Promptly, when if the WLAN user in the foregoing description need use the IMS in PS territory professional, after it is judged this locality the PDG address corresponding with this business arranged, then directly send the request of setting up the tunnel to this PDG, be direct repeated execution of steps 303, thereby avoided the process of this PDG of dns resolution.
When if this WLAN user need use the game service in PS territory, after it judges the local not PDG address corresponding with this business, then at first ask DNS to resolve, to obtain the IP address of the PDG that this game service can be provided, and select an IP address from the IP address that is obtained after, execution in step 303 again.
Figure 4 shows that the flow chart of using the embodiment of the invention two.WLAN user terminal in the present embodiment has been ordered generic web page browse service, IMS business and game service, and system configuration does not allow the aaa server in the home network under this user terminal the order business information of user terminal to be sent to the PDG of its authentication of request.
Step 401, the WLAN user terminal is finished the access authentication mandate by WLAN Access Network and aaa server; Preserve this user's order business information, the information of promptly having preserved the generic web page browse service that this user has ordered, IMS business and game service at aaa server;
Step 402 inserts the packet switch domain service of 3GPP first at the WLAN user terminal, then asks dns resolution that the IP address of the PDG of service that applies for, selected IP address from the IP address that is obtained then can be provided;
In the present embodiment, when the user need apply for the generic web page browse service, then ask dns resolution that the IP address of the PDG of generic web page browse service can be provided, from the one or more IP address that obtains, select an IP address then;
Step 403, WLAN user terminal are sent to the PDG of selected IP address correspondence and are set up the tunnel connection requests; In the present embodiment, suppose that the selected PDG of WLAN user terminal supports generic web page browse service, IMS business and electronic commerce affair;
Step 404, after PDG receives request from the user, when the order business information of this user terminal was not preserved in definite this locality, then the aaa server of home network sent the request that comprises the authentication of asking this user terminal order business information under this user;
Step 405, aaa server weight discriminating and key agreement protocol (AKA) agreement and WLAN user recognize each other card, if authentication success, then execution in step 406, otherwise a new PDG address is sent to user terminal, and process ends;
Step 406, aaa server is given the PDG authorization message, does not comprise the user terminal information of order business in this authorization message;
Step 407, after PDG receives authorization message, judging does not have user terminal during the information of ordering services, after then whole business information of self supporting can being inserted into the message of setting up the tunnel, send the response message that this sets up the tunnel to user terminal, the title that promptly comprises generic web page browse service, IMS business and electronic commerce affair in this message, Business Name is identified by WLAN (wireless local area network) service access roll-call W-APN; Perhaps, this PDG also can not send the business information that self supports, promptly handles according to existing procedure;
Step 408, WLAN user terminal are carried out corresponding preservation to the Business Name in the response message with the address of this PDG, and are preestablished the holding time after receiving response message, and this holding time can be that the user sets, and also can be the default time of user terminal; And user terminal can adopt one of following dual mode to preserve:
A kind of preserving type is: will preserve from all Business Names and this PDG address of PDG, the title that is about to generic web page browse service, IMS business and electronic commerce affair is all preserved with this PDG address, like this, though some business, as electronic commerce affair, the user does not order, and preserves but it is carried out correspondence yet; If user terminal has been ordered electronic commerce affair again preestablishing in the holding time, then this user terminal can utilize the corresponding relation of this Business Name preserved and PDG address and this PDG to get in touch, if user terminal is not ordered this business preestablishing in the holding time always, then after surpassing the holding time, the corresponding relation of the title of this electronic commerce affair and this PDG address is with deleted;
Another kind of preserving type is: user terminal filters earlier the Business Name in the response message, the Business Name that is about in the response message is compared with the service lists of having ordered of oneself preserving, determine support and the Business Name that self has ordered of this PDG, preserve this Business Name determined and the corresponding relation of this PDG address again; That is, this moment, user terminal was only preserved the corresponding relation of generic web page browse service and IMS Business Name and this PDG address; If user terminal has used the corresponding relation of being preserved preestablishing in the holding time, then the holding time of this corresponding relation will upgrade, and promptly reinitialize the holding time of this corresponding relation; If the corresponding relation that the WLAN user terminal is preserved never was used in the predefined holding time, then after exceeding the holding time, this corresponding relation will be deleted automatically;
Step 409, PDG and this WLAN user terminal are set up the tunnel, carry out the business of its application, and promptly PDG provides the service of generic web page browse service for it.
In the above-described embodiments, after PDG receives request from the user, if when determining that the order business information of this user terminal is not preserved in this locality, also can under this user, send the request that does not comprise the authentication of asking this user terminal order business information by the aaa server of home network; After this PDG receives authorization messages from the success of aaa server, collocation strategy according to itself is inserted into whole business information of self supporting in the message of setting up the tunnel, and send the response message that this sets up the tunnel to user terminal, promptly comprise the title of generic web page browse service, IMS business and electronic commerce affair in this message; Perhaps, this PDG also can not send the business information that self supports, promptly handles according to existing procedure.
In the above-described embodiments, after PDG receives request from the user, if determine self to preserve this user terminal information of ordering services, then the aaa server of home network sends the request that does not comprise the authentication of asking this user terminal order business information under this user; If authentication success, Business Name that the user that this PDG preserves oneself has ordered and the Business Name that self can support compare, thereby determine self support and business information that the user has ordered, and this information inserted return to the setting up in the message in the tunnel response message of user, in the present embodiment, PDG determines that through relatively generic web page browse service and IMS business are self support and business information that the user has ordered; If authentification failure, this PDG sends to user terminal with a new PDG address, and process ends.
When WLAN user is non-when inserting the PS territory first, at first judge the local PDG address that whether remains to be applied for the access service correspondence,, then directly send the request of setting up the tunnel to this PDG if having, otherwise after dns resolution, send the request of setting up the tunnel to selected PDG more again; Promptly, when if the WLAN user in the foregoing description need use the IMS in PS territory professional, after it is judged this locality the PDG address corresponding with this business arranged, then directly send the request of setting up the tunnel to this PDG, be direct repeated execution of steps 403, thereby avoided the process of this PDG of dns resolution.
For above-mentioned all embodiment, this user subscribes service information is all directly from the aaa server in the home network under this user terminal.If above-mentioned WLAN user terminal is in the home network, the PDG that then sends request directly and the aaa server in the home network get in touch; If above-mentioned WLAN user terminal is in the accesses network, the PDG that sends request gets in touch by the aaa server in the home network under the aaa server in the accesses network and this user terminal.
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 done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (9)

1, user terminal obtains the method for packet data gateway information in a kind of WLAN (wireless local area network), it is characterized in that this method may further comprise the steps:
If PDG self preserves the information of order business of user terminal, and after this PDG receives successful authorization messages from aaa server, that support and business information that this application access user terminal has been ordered returns to user terminal with self, and user terminal is preserved the information from PDG;
If PDG self does not have the information of order business of user terminal, and after this PDG receives successful authorization messages from aaa server, this PDG judges the information that whether includes the user terminal order business in the authorization messages that receives, if, then that support and business information that this application access user terminal has been ordered returns to user terminal with self, and user terminal is preserved the information from PDG; Otherwise, all business information of self supporting are returned to user terminal, user terminal is preserved the information from PDG, or handles according to old process, and process ends;
If PDG receives the message that can not authorize from the authentification failure of aaa server, then direct process ends.
2, method according to claim 1, it is characterized in that, if PDG self does not have the information of order business of user terminal, and after the aaa server authentication success, before the authorization messages that returns success to PDG, further comprise: judge from the information that whether comprises request user terminal order business in the authentication request message of PDG, if do not comprise, do not insert the information of user subscribes service in the successful authorization messages that then returns yet, if comprise, then pre-configured according to system, the information of insertion user terminal order business in the authorization messages of the success of returning, perhaps, in the successful authorization messages that returns, do not insert the information of user subscribes service.
3, method according to claim 1 is characterized in that,
If PDG self preserves the information of order business of user terminal, the business information that all business information that described self support and business information that this application access user terminal has been ordered is PDG to be supported by comparison self and the user terminal of self preserving have been ordered is determined;
If PDG self does not have the information of order business of user terminal, the business information that all business information that described self support and business information that this application access user terminal has been ordered is PDG to be supported by comparison self and the user terminal in the authorization messages have been ordered is determined.
4, method according to claim 1 is characterized in that,
If PDG supports self and this application inserts the business information that the user ordered and sends to user terminal, then user terminal is preserved the Business Name self ordered and this PDG supports and the corresponding relation of this PDG address;
If PDG sends to user terminal with all business information of self supporting, then user terminal is preserved from all Business Names of PDG and the corresponding relation of this PDG address, perhaps, user terminal will compare from all Business Names of PDG and self order business title, after determining that support and the Business Name that self has ordered of this PDG, preserve that self has ordered again and the Business Name that this PDG supports and the corresponding relation of this PDG address.
5, method according to claim 4, it is characterized in that, this method further comprises: preestablish the holding time of corresponding relation, after corresponding relation that the WLAN user terminal is preserved exceeded the predefined holding time, this corresponding relation was deleted automatically.
6, method according to claim 4 is characterized in that, this method further comprises: after the WLAN user terminal has used certain corresponding relation of having preserved, reinitialize the holding time of this corresponding relation.
7, method according to claim 5 is characterized in that, the length of described holding time is the default value of user terminal, or is set by the user.
8, method according to claim 1, it is characterized in that, this method further comprises: insert the PS territory first and use certain when professional when user terminal is non-, at first judge and self whether preserve the pairing PDG of this business address, if have, then directly send request and insert message to this PDG, and after by PDG this request message being forwarded to aaa server, continue to carry out subsequent step, otherwise this user terminal is selected IP address from the IP address that dns resolution goes out, and sends request to the pairing PDG in this selected IP address again and inserts message, and after by PDG this request message being forwarded to aaa server, continue to carry out subsequent step.
9, method according to claim 1 is characterized in that, described user terminal order business information is identified by WLAN (wireless local area network) service access roll-call W-APN.
CNB2004100004297A 2004-01-18 2004-01-18 Method for obtaining packet data gate information by user terminal for wireless LAN Expired - Fee Related CN100387010C (en)

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PCT/CN2005/000077 WO2005074193A1 (en) 2004-01-18 2005-01-18 A method for the user terminal to acquire the information of the packet data gateway in the wlan

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KR100861929B1 (en) 2007-01-23 2008-10-09 삼성전자주식회사 Apparatus and method for providing pdg information

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KR100421931B1 (en) * 2001-09-04 2004-03-11 주식회사 현대시스콤 User information transmission method between pdsn and aaa server in imt-2000 data core network

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CN1992665B (en) * 2005-12-31 2010-10-13 华为技术有限公司 Method for acquiring accessing gateway information of wireless LAN

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