CN101262705B

CN101262705B - Method and system for connection establishment and release in roaming user session

Info

Publication number: CN101262705B
Application number: CN2008100930240A
Authority: CN
Inventors: 费鹏; 刘力
Original assignee: UTStarcom Telecom Co Ltd
Current assignee: UTStarcom Telecom Co Ltd
Priority date: 2008-04-15
Filing date: 2008-04-15
Publication date: 2011-05-11
Anticipated expiration: 2028-04-15
Also published as: CN101262705A

Abstract

The invention relates to a conversation connection and establishment method for roaming subscribers. After establishing an RP connection and completing a PPP link control and a PPP authentication, a visitor location PDSN obtains an IP address of a home location PDSN; a renegotiation procedure and the PPP authentication of the PPP link control are started through a PP connection and an access request authentication is processed on an access terminal; after passing the authentication, an IP address is distributed to the access terminal through a PPP IP address control procedure and the connection between the access terminal and the home location PDSN is established. The invention further relates to a conversation connection and establishment system for the roaming subscribers and a conversation connection release method for the roaming subscribers and a system thereof, wherein, the visitor location PDSN uses the PP connection to complete the process of connection establishment between the access terminal and the home location PDSN, thus using the PP connection to provide a transmission channel of business data so as to support the data regression for the roaming subscribers.

Description

The method and system that roamer's session connection is set up and discharged

Technical field

The present invention relates to code division multiple access (CDMA) 2000 network technologies, relate in particular to roaming user terminal and ownership place packet data serving node in a kind of CDMA2000 network (PacketData Serving Node is called for short PDSN) and set up and discharge the method and system of session connection.

Background technology

In CDMA2000 network architecture (can with reference to standards such as 3GPP2X.S0011, A.S0011 and A.S0017), as shown in Figure 1, PDSN is continuous with wireless network (Radio Network is called for short RN) by RP (between Radio Network and PDSN) interface.RN connects by air interface (Air Interface) and access terminal (Access Terminal is called for short AT) and carries out guaranteeing that AT still can use network when mobile alternately.PDSN provides the ability of access (Internet) to AT, and comprising to terminal provides IP address (the Internet agreement is referring to RFC791) and transmit function such as packet between Internet and AT.

As shown in Figure 2, be linked into the protocol stack schematic diagram of each network node in the process of Internet by wireless network and PDSN for accessing terminal.AT seals IP and is contained in PPP (peer-peer protocol, referring to RFC1548 and RFC1661) in the frame, then the PPP frame is packaged into link layer access control layer (Link Access Control, be called for short LAC) and medium access control preparative layer (Medium Access Control, abbreviation MAC) form of definition sends to RN by the form that the airlink layer needs by air interface by MAC at last.RN carries out format conversion with the frame that receives, and the form that changes into the RP interface definition sends to PDSN.PDSN is reduced into the form of PPP frame with frame, further is reduced into the form of IP bag, sends to Internet.

If switching (Handoff) has taken place in AT when using business, be that AT has moved to new wireless network (Target RN) from original wireless network (Serving RN) when being in activated state, and Target RN is merely able to be connected to new PDSN (TargetPDSN) and can not be connected to is providing serving PDSN (Serving PDSN), the quick switching flow of network-triggered this moment connects with PP (PDSN-PDSN) interface between Target PDSN and the Serving PDSN.The schematic diagram that connects by the PP interface between Serving PDSN and the Target PDSN during as shown in Figure 3, for switching.

The PP interface is generally used for quick switching (FastHandoff) in the CDMA2000 network.The protocol stack of each network node when Fig. 4 has further provided quick switching.Compare the PP interface between many Target PDSN and the Serving PDSN with the protocol stack that Fig. 2 provides.

By the PP interface, the operation of reduction PPP frame and IP bag is still finished by Serving PDSN, has guaranteed AT in the process that moves, and the business of using can not interrupted.But after the user roams into visit ground (place that the user moves to is visit ground), the business that ownership place (the signatory place of user and operator is ownership place) provides is used in continuation if desired, and system can require user's data is forwarded to PDSN of home location from visit ground PDSN.And the PP interface guarantees that the user do not interrupt in the business that moving process uses when only being used for switching fast, can not provide roaming user data is returned the support that belongs to.

Summary of the invention

First purpose of the present invention is to propose a kind of roamer's session connection method for building up and system, can set up session connection between roaming user terminal and ownership place packet data serving node, and the support that roaming user data is returned genus is provided.

Second purpose of the present invention is to propose a kind of roamer's conversation release method and system, can discharge the session connection of setting up between roamer and the PDSN of home location.

For realizing above-mentioned first purpose, the invention provides a kind of roamer's session connection method for building up, roam into visit ground access terminal and wireless network is set up airlink, and wireless network and visit ground PDSN set up RP and be connected, finish ppp link is controlled and the PPP authentication after, may further comprise the steps:

Described visit ground PDSN obtains the IP address of PDSN of home location;

Described visit ground PDSN sets up PP according to the IP address of described PDSN of home location with described PDSN of home location and is connected;

Described PDSN of home location connects with described accessing terminal by PP initiates the heavily negotiation flow process and the PPP authorizing procedure of ppp link control, and described accessing terminal inserted request authentication;

Described PDSN of home location is the described distributing IP address that accesses terminal by PPP IP address control flow after inserting request authentication and passing through, and sets up described accessing terminal and being connected of described PDSN of home location.

Further, the operation of the IP address of described visit ground PDSN acquisition PDSN of home location can specifically comprise:

Described visit ground PDSN sends RADIUS to visit ground aaa server (Authentication, Authorization and Accounting Server promptly verify, mandate and accounting server) and inserts request message;

Described visit ground aaa server inserts request message with described remote authentication dial-in user service (RemoteAuthentication Dial In User Service is called for short RADIUS) and is transmitted to the ownership place aaa server;

Described ownership place aaa server inserts the IP address of request message inquiry and the described corresponding PDSN of home location that accesses terminal according to described RADIUS, and by RADIUS insert receive the response to described visit aaa server return the IP address of described PDSN of home location;

Described visit ground aaa server returns to described visit ground PDSN with the IP address of described PDSN of home location.

Further, the operation of the IP address of described visit ground PDSN acquisition PDSN of home location can also be specially:

Described visit ground PDSN reads RP and connects international mobile subscriber identity (International Mobile Subscriber Identification Number in the registration message when setting up, be called for short IMSI), and inquiry is pre-stored in the IP address of PDSN of home location corresponding with this IMSI in the address mapping table of described visit ground PDSN.

Further, described visit ground PDSN sets up the operation that PP is connected according to the IP address of described PDSN of home location and described PDSN of home location and is specially:

Described visit ground PDSN sends to the IP address of described PDSN of home location with the registration message of PP interface definition, with set up with described PDSN of home location between PP be connected.

Further, after described visit ground PDSN obtains the IP address of PDSN of home location, can also comprise IP address step relatively, be specially:

Relatively whether its own IP address is identical with the IP address of described PDSN of home location for described visit ground PDSN, they be that then described visit ground PDSN directly connects with described accessing terminal, otherwise PDSN and described PDSN of home location are set up the PP step of connecting with continuing described visit.

Further, describedly can be specially the described operation that inserts request authentication that accesses terminal:

Described PDSN of home location sends RADIUS to described ownership place aaa server and inserts request message, to carry out the described authentication that accesses terminal;

Described ownership place aaa server inserts by RADIUS receives the response to described PDSN of home location return authentication result.

In order to realize above-mentioned second purpose, the invention provides a kind of roamer's conversation release method, may further comprise the steps:

Access terminal and initiate ppp link control process ends to PDSN of home location, with discharge described access terminal and PDSN of home location between connection;

Described PDSN of home location is initiated the PP interface to visit ground PDSN and is discharged flow process;

Described visit ground PDSN initiates the RP interface to wireless network and discharges flow process;

Described wireless network discharges and the described airlink that accesses terminal.

In order to realize above-mentioned first purpose, the invention provides a kind of roamer's session connection and set up system, comprising:

Wireless network is used for setting up airlink with roaming into accessing terminal of visit ground, and sets up RP and is connected, finishes ppp link with visit ground PDSN and control and the PPP authentication;

Visit ground PDSN is used to obtain the IP address of PDSN of home location, and sets up PP according to the IP address of described PDSN of home location with described PDSN of home location and be connected;

PDSN of home location, be used for connecting heavily negotiation flow process and the PPP authorizing procedure of controlling with the described initiation ppp link that accesses terminal by PP, and described accessing terminal inserted request authentication, after the access request authentication is passed through, by PPP IP address control flow is the described distributing IP address that accesses terminal, and sets up described accessing terminal and being connected of described PDSN of home location.

Further, this system can also comprise:

Visit ground aaa server, be used to receive and transmit the RADIUS access request message of described visit ground PDSN transmission to the ownership place aaa server, and behind the IP address that receives the described PDSN of home location that described visit ground aaa server returns, with the IP address of described PDSN of home location PDSN with sending to described visit;

The ownership place aaa server, be used for inserting the IP address of request message inquiry and the described corresponding PDSN of home location that accesses terminal according to described RADIUS, and by RADIUS insert receive the response to described visit aaa server return the IP address of described PDSN of home location.

Further, described visit ground PDSN can also comprise:

Identity reading module is used for reading the IMSI that RP connects the registration message when setting up;

The address lookup module is used for inquiring about the IP address of the address mapping table that the is pre-stored in described visit ground PDSN PDSN of home location corresponding with this IMSI.

Further, described visit ground PDSN can also comprise:

IP address comparison module, be used for behind the IP address that obtains PDSN of home location, whether more described visit ground PDSN its own IP address is identical with the IP address of described PDSN of home location, be then directly to connect, otherwise continue to set up the PP step of connecting with described PDSN of home location with described accessing terminal.

In order to realize above-mentioned second purpose, the present invention also provides a kind of roamer's session delivery system, comprising:

Access terminal, be used for initiating ppp link control process ends to PDSN of home location, with discharge described access terminal and PDSN of home location between connection;

PDSN of home location, be used for discharge described access terminal and PDSN of home location between connection after, initiate the PP interface to visit ground PDSN and discharge flow process;

Visit ground PDSN is used for after the PP interface discharges flow process, initiates the RP interface to wireless network and discharges flow process;

Wireless network is used for discharging and the described airlink that accesses terminal after the RP interface discharges flow process.

Based on technique scheme, visit ground PDSN builds PP according to the IP address of the PDSN of home location that obtains with PDSN of home location and is connected among the present invention, and on the PP connection basis, set up and accessed terminal and being connected of PDSN of home location, thereby utilize the transmission channel that PP connects provides business datum, provide support for roaming user data returns to belong to.

Description of drawings

Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:

Fig. 1 is the structural representation of existing CDMA2000 network system.

Fig. 2 is linked into the protocol stack schematic diagram of each network node of Internet for terminal in the existing CDMA2000 network system by wireless network and PDSN.

Fig. 3 is the connection diagram of PP interface between two PDSN in the existing CDMA2000 network system.

The protocol stack schematic diagram of each network node when Fig. 4 switches in the CDMA2000 network system fast for having now.

Fig. 5 is the schematic flow sheet of an embodiment of roamer's session connection method for building up of the present invention.

Fig. 6 is for obtaining the schematic flow sheet of the IP address of PDSN of home location among Fig. 5 embodiment.

Fig. 7 is the schematic flow sheet of another embodiment of roamer's session connection method for building up of the present invention.

Fig. 8 is the signalling diagram of an instantiation of roamer's session connection method for building up of the present invention.

Fig. 9 is the form schematic diagram of the registration message of PP interface of the present invention;

Figure 10 is the schematic flow sheet of an embodiment of roamer's session connection method for releasing of the present invention.

Figure 11 is the signalling diagram of an instantiation of roamer's session connection method for releasing of the present invention.

Figure 12 sets up the schematic flow sheet of an embodiment of system for roamer's session connection of the present invention.

Figure 13 sets up the schematic flow sheet of another embodiment of system for roamer's session connection of the present invention.

Figure 14 is the schematic flow sheet of an embodiment of roamer's session connection delivery system of the present invention.

Embodiment

Below by drawings and Examples, technical scheme of the present invention is described in further detail.

The present invention has realized roamer's user data when the use of visit ground is professional is returned the support in possession by the PP interface, only is used for protecting when switching fast professional unbroken purposes to expand the PP interface to prior art.

As shown in Figure 5, be the schematic flow sheet of an embodiment of roamer's session connection method for building up of the present invention, idiographic flow may further comprise the steps:

Step 101, roam into the accessing terminal when making a call of visit ground, set up airlink with wireless network by air interface, and wireless network is set up RP with visit ground PDSN and is connected, to visit ground PDSN user on-line notification, next access terminal and PDSN between initiate ppp link control flow and PPP authorizing procedure, finish ppp link control and PPP authentication;

Step 102, visit ground PDSN obtain the IP address of PDSN of home location;

Step 103, visit ground PDSN set up PP according to the IP address of PDSN of home location with PDSN of home location and are connected;

Step 104, PDSN of home location connect heavily negotiation flow process and the PPP authorizing procedure of controlling with the initiation ppp link that accesses terminal by PP, and insert request authentication to accessing terminal;

Step 105, PDSN of home location be the distributing IP address that accesses terminal by PPP IP address control flow after inserting request authentication and passing through, foundation accesses terminal and being connected of PDSN of home location.

For PP establishment of connection in the completing steps 103, visit ground PDSN need obtain the IP address of PDSN of home location, here provide one by and the ownership place aaa server between interacting message obtain the method example of the IP address of PDSN of home location, detailed process comprises as shown in Figure 6:

Step 102a, visit ground PDSN send RADIUS to visit ground aaa server and insert request message;

Step 102b, visit ground aaa server insert request message with RADIUS and are transmitted to the ownership place aaa server;

Step 102c, ownership place aaa server insert the IP address of request message inquiry and the corresponding PDSN of home location that accesses terminal according to RADIUS, and by RADIUS insert receive the response to visit aaa server return the IP address of PDSN of home location;

Step 102d, visit ground aaa server return to visit ground PDSN with the IP address of PDSN of home location.

In another embodiment, the IP address that obtains PDSN of home location can be in the following ways: visit ground PDSN reads RP and connects IMSI in the registration message when setting up, and inquiry is pre-stored in the IP address of PDSN of home location corresponding with IMSI in the address mapping table of visit ground PDSN.This mode generally needs deposit one or more address mapping table in advance in visit ground PDSN, has comprised the mapping relations between the IP address of user's IMSI and PDSN of home location and PDSN of home location in this address mapping table.

Present invention focuses on to visit ground PDSN sets up PP according to the IP address of PDSN of home location with it and is connected; though only provided the example that two kinds of interacting message modes obtain the IP address of PDSN of home location among the above embodiment; but should not be regarded as visiting the restriction that ground PDSN obtains the IP address mode of PDSN of home location, all be encompassed within protection scope of the present invention and should be considered as all feasible obtain manners.

In the process of setting up the PP connection of step 103, visit ground PDSN can send to the registration message of PP interface definition the IP address of PDSN of home location earlier, with set up with PDSN of home location between PP is connected, PDSN of home location can react this registration message, affirmation PP establishment of connection.

In step 104, PDSN of home location inserts request authentication to accessing terminal process can may further comprise the steps: PDSN of home location sends RADIUS to the ownership place aaa server and inserts request message, with the authentication that accesses terminal; The ownership place aaa server to this access terminal authenticate after, insert by RADIUS and to receive the response to PDSN of home location return authentication result.

As shown in Figure 7, be the schematic flow sheet of another embodiment of roamer's session connection method for building up of the present invention.Compare with a last embodiment, present embodiment also comprises IP address step relatively after step 102.This comparison step further comprises:

Relatively whether its own IP address is identical with the IP address of PDSN of home location for step 103a, visit ground PDSN, is execution in step 103b then; Otherwise execution in step 103 continues visit ground PDSN and PDSN of home location is set up the PP step of connecting;

Step 103b, visit ground PDSN directly connect with accessing terminal.

Present embodiment has been considered a kind of special circumstances, and promptly visit ground PDSN and PDSN of home location have used same IP address, does not just need to set up PP this moment and connects and just can not realize professional establishment of connection, and therefore visit ground PDSN directly and access terminal and connect.

Two embodiment that following basis is above, and in conjunction with the signalling diagram of method instantiation shown in Figure 8, come the process of whole roamer's session connection is carried out complete detailed description, step is as follows:

Step 201, certain accesses terminal and roams into visit ground A, and initiates a service call at visit ground A, access terminal this moment and wireless network between set up airlink by air interface;

Set up RP between step 202, wireless network and the visit ground PDSN and connect, and notice visit ground PDSN notifies this corresponding user that accesses terminal to reach the standard grade;

Step 203, this accesses terminal and visit between the ground PDSN and initiate the ppp link control flow, finishes ppp link control;

Step 204, this accesses terminal and visit between the ground PDSN and initiate the PPP authorizing procedure, finishes the PPP authentication;

Step 205, visit ground PDSN initiate RADIUS to visit ground aaa server and insert message (RADIUS Access Request message is referring to 3GPP2X.S0011 standard and RFC2865);

Step 206, visit ground aaa server are transmitted this access message to the ownership place aaa server, and the ownership place aaa server returns to visit ground aaa server with this IP address after having inquired about the IP address of PDSN of home location;

Step 207, visit ground aaa server return to visit ground PDSN with the IP address of PDSN of home location again, can compare this moment to the IP of PDSN of home location and the IP of visit ground PDSN self, if difference then continue step 208, otherwise continue the subsequent voice calls flow process according to the definition of 3GPP2A.S0017 standard;

The registration message that step 208, visit ground PDSN send the PP interface definition is to PDSN of home location, and visit ground PDSN sets up PP with PDSN of home location and is connected;

Step 209, PDSN of home location and access terminal between initiate the heavily negotiation flow process of ppp link control;

Step 210, PDSN of home location and access terminal between initiate the PPP authorizing procedure;

Step 211, PDSN of home location send RADIUS access request message and to the ownership place aaa server this corresponding user that accesses terminal are authenticated;

Step 212, ownership place aaa server insert by RADIUS receives the response to PDSN of home location return authentication result;

Step 213, PDSN of home location are the distributing IP address that accesses terminal by PPP IP address control flow after the access request authentication is passed through;

Step 214, access terminal and PDSN of home location between session connection set up successfully, access terminal and PDSN of home location business transferring data mutually.

In this example, the RP establishment of connection can reference standard 3GPP2A.S0017 is arranged, X.S0011, the ppp link control flow can be with reference to standard IETF RFC1332 " The PPPInternet Protocol Control Protocol (IPCP) ", RFC1334 " PPPAuthentication Protocols ", RFC1661 " The Point-to-Point Protocol (PPP) ", RFC1662 " PPP in HDLC-like Framing ", RFC1877 " PPPInternet Protocol Control Protocol Extensions for Name ServerAddresses ", RFC1994 " PPP Challenge Handshake AuthenticationProtocol (CHAP) ".Wherein RFC1332 and RFC1994 describe address control flow, RFC1661 to have described the framework of entire PP P flow process and comprise that controlling links (LCP) flow process, RFC1334 and RFC1994 have described authorizing procedure, RFC1662 and described concrete PPP envelope frame format, have not just described in detail one by one here.

The registration message of PP interface definition can be according to the message format in the existing standard P P call flow in above-mentioned steps 208, for example adopt form shown in Figure 9, because in existing standard P P call flow, " S " bit position among the Flags is that 1 expression PDSN of home location wants while PDSN before switching to send identical data with switching back PDSN, in order to distinguish, can be 0 with " S " bit position of Flags.But the setting of bit is difference for the convenience of the user only, should not be construed as the restriction to message format in the PP call flow.

As shown in figure 10, be the schematic flow sheet of an embodiment of roamer's session connection method for releasing of the present invention.After setting up session connection according to each roamer's session connection method for building up of front, can adopt present embodiment that session connection is discharged, specifically comprise following flow process:

Step 301, access terminal and initiate ppp link control process ends to PDSN of home location, with release access terminal and PDSN of home location between connection;

Step 302, PDSN of home location are initiated the PP interface to visit ground PDSN and are discharged flow process;

Step 303, visit ground PDSN initiate the RP interface to wireless network and discharge flow process;

Step 304, wireless network discharge and the airlink that accesses terminal.

According to the embodiment of above-mentioned method for releasing, provide roamer's session connection shown in Figure 11 to discharge the signalling diagram of the instantiation of flow process, this flow process may further comprise the steps:

Step 401, access terminal and initiate ppp link control process ends to PDSN of home location, with release access terminal and PDSN of home location between connection;

Step 402, PDSN of home location are initiated the PP interface to visit ground PDSN and are discharged flow process;

Step 403, visit ground PDSN initiate the RP interface to wireless network and discharge flow process;

Step 404, wireless network discharge and the airlink that accesses terminal.

One of ordinary skill in the art will appreciate that: all or part of step that realizes said method embodiment can be finished by the relevant hardware of program command, aforesaid program can be stored in the computer read/write memory medium, this program is carried out the step that comprises said method embodiment when carrying out; And aforesaid storage medium comprises: various media that can be program code stored such as ROM, RAM, magnetic disc or CD.

As shown in figure 12, set up the schematic flow sheet of an embodiment of system for roamer's session connection of the present invention.Present embodiment has at least with the lower part and constitutes: wireless network 1, visit ground PDSN 2 and PDSN of home location 3.Wherein wireless network 1 is used for setting up airlink with roaming into accessing terminal of visit ground, and sets up RP and is connected, finishes ppp link with visit ground PDSN 2 and control and the PPP authentication.

Visit ground PDSN 2 is used to obtain the IP address of PDSN of home location 3, and sets up PP according to the IP address of PDSN of home location with PDSN of home location 3 and be connected.In the present embodiment, visit ground PDSN 2 can also comprise IP address comparison module, be used for behind the IP address that obtains PDSN of home location 3, relatively whether visit ground PDSN 2 its own IP address are identical with the IP address of PDSN of home location 3, be then directly to connect with accessing terminal, otherwise continue to set up the PP step of connecting with PDSN of home location 3.

PDSN of home location 3 is used for connecting heavily negotiation flow process and the PPP authorizing procedure of controlling with the initiation ppp link that accesses terminal by PP, and insert request authentication to accessing terminal, after the access request authentication is passed through, be the distributing IP address that accesses terminal by PPP IP address control flow, set up and to access terminal and being connected of PDSN of home location 3.

As shown in figure 13, set up the schematic flow sheet of another embodiment of system for roamer's session connection of the present invention.Compare with a last embodiment, present embodiment has increased visit ground aaa server 4 and ownership place aaa server 5.Wherein, the RADIUS that visit ground aaa server 4 is used to PDSN 2 transmissions with receiving and transmit described visit inserts request message to ownership place aaa server 5, and behind the IP address that receives the described PDSN of home location 3 that described visit ground aaa server 5 returns, with the IP address of described PDSN of home location 3 PDSN 2 with sending to described visit.

Ownership place aaa server 5 is used for inserting according to described RADIUS the IP address of request message inquiry and the described corresponding PDSN of home location 3 that accesses terminal, and by RADIUS insert receive the response to described visit aaa server 4 return the IP address of described PDSN of home location 3.

In another embodiment, visit ground PDSN can also comprise that identity reading module and address lookup module are used for obtaining the IP address of PDSN of home location.Wherein identity reading module is used for reading the IMSI that RP connects the registration message when setting up, and the address lookup module is used for inquiring about the IP address of the address mapping table that the is pre-stored in visit ground PDSN PDSN of home location corresponding with IMSI.

Though above embodiment only provides two kinds of modes that obtain the IP address of PDSN of home location 3; but provide this dual mode should not be regarded as visit ground PDSN 2 is obtained the restriction of the IP address of PDSN of home location 3, and the protection range that obtains the IP address of PDSN of home location 3 should have been expanded to other acquisition modes.

In the present embodiment, visit ground PDSN 2 is when PDSN of home location 3 is set up PP and is connected, can earlier the registration message of PP interface definition be sent to the IP address of described PDSN of home location 3, with set up with described PDSN of home location between PP is connected, and reception PDSN of home location 3 return receive the response after set up the PP connection.

In addition, accessing terminal when inserting request authentication to described, PDSN of home location 3 can send RADIUS to described ownership place aaa server 5 earlier and insert request message, to carry out the described authentication that accesses terminal, ownership place aaa server 5 inserts by RADIUS and receives the response to described PDSN of home location 3 return authentication results then.

Visit ground PDSN 2 sets up PP according to the IP address of the PDSN of home location 3 that obtains with PDSN of home location 2 and is connected in the present embodiment, and on the PP connection basis, finished the process of foundation that is connected that accesses terminal with PDSN of home location 2, thereby utilize the transmission channel that PP connects provides business datum, provide support for roaming user data returns to belong to.

As shown in figure 14, be the schematic flow sheet of an embodiment of roamer's session connection delivery system of the present invention.Present embodiment comprises with the lower part: access terminal 6, PDSN of home location 3, visit ground PDSN 2 and wireless network 1.Wherein accessing terminal 6 is used for initiating ppp links control process ends to PDSN of home location 3, with discharge described access terminal 6 and PDSN of home location 3 between connection.

PDSN of home location 3 be used for discharge described access terminal 6 and PDSN of home location 3 between connection after, initiate the PP interfaces to visit ground PDSN 2 and discharge flow processs.

Visit ground PDSN 2 is used for after the PP interface discharges flow process, initiates the RP interface to wireless network 1 and discharges flow process.

Wireless network 1 is used for after the RP interface discharges flow process, discharges and described 6 the airlink of accessing terminal.

Should be noted that at last: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit; Although with reference to preferred embodiment the present invention is had been described in detail, those of ordinary skill in the field are to be understood that: still can make amendment or the part technical characterictic is equal to replacement the specific embodiment of the present invention; And not breaking away from the spirit of technical solution of the present invention, it all should be encompassed in the middle of the technical scheme scope that the present invention asks for protection.

Claims

1. roamer's session connection method for building up, roam into visit ground access terminal and wireless network is set up airlink, and wireless network and visit ground packet data serving node set up RP and be connected, finish ppp link is controlled and the PPP authentication after, described RP is connected to being connected between wireless network and the packet data serving node, may further comprise the steps:

Described visit ground packet data serving node obtains the IP address of ownership place packet data serving node;

Described visit ground packet data serving node is set up PP according to the IP address of described ownership place packet data serving node with described ownership place packet data serving node and is connected, and described PP is connected to being connected between packet data serving node and the packet data serving node;

Described ownership place packet data serving node connects with described accessing terminal by PP initiates the heavily negotiation flow process and the PPP authorizing procedure of ppp link control, and described accessing terminal inserted request authentication;

Described ownership place packet data serving node is the described distributing IP address that accesses terminal by PPPIP address control flow after inserting request authentication and passing through, and sets up described accessing terminal and being connected of described ownership place packet data serving node.

2. roamer's session connection method for building up according to claim 1, the operation that wherein said visit ground packet data serving node obtains the IP address of ownership place packet data serving node specifically comprises:

Described visit ground packet data serving node sends remote authentication dial-in user service to visit ground checking, mandate and accounting server and inserts request message;

Described visit ground checking, mandate and accounting server insert request message with described remote authentication dial-in user service and are transmitted to ownership place checking, mandate and accounting server;

Described ownership place checking, mandate and accounting server insert the IP address of request message inquiry and the described ownership place packet data serving node that accesses terminal corresponding according to described remote authentication dial-in user service, and by remote authentication dial-in user service insert receive the response to described visit checking, mandate and accounting server return the IP address of described ownership place packet data serving node;

Described visit ground checking, mandate and accounting server return to described visit ground packet data serving node with the IP address of described ownership place packet data serving node.

3. roamer's session connection method for building up according to claim 1, the operation that wherein said visit ground packet data serving node obtains the IP address of ownership place packet data serving node is specially:

Described visit ground packet data serving node reads RP and connects international mobile subscriber identity in the registration message when setting up, and inquiry is pre-stored in the IP address of ownership place packet data serving node corresponding with described international mobile subscriber identity in the address mapping table of described visit ground packet data serving node.

4. roamer's session connection method for building up according to claim 1, wherein said visit ground packet data serving node is set up the operation that PP is connected according to the IP address of described ownership place packet data serving node and described ownership place packet data serving node and is specially:

Described visit ground packet data serving node sends to the IP address of described ownership place packet data serving node with the registration message of PP interface definition, with set up with described ownership place packet data serving node between PP be connected.

5. roamer's session connection method for building up according to claim 1 wherein after described visit ground packet data serving node obtains the IP address of ownership place packet data serving node, also comprises IP address step relatively, is specially:

Relatively whether its own IP address is identical with the IP address of described ownership place packet data serving node for described visit ground packet data serving node, they be that then described visit ground packet data serving node directly connects with described accessing terminal, otherwise packet data serving node and described ownership place packet data serving node are set up the PP step of connecting with continuing described visit.

6. roamer's session connection method for building up according to claim 1 wherein saidly is specially the described operation that inserts request authentication that accesses terminal:

Described ownership place packet data serving node sends remote authentication dial-in user service to described ownership place checking, mandate and accounting server and inserts request message, to carry out the described authentication that accesses terminal;

Described ownership place checking, mandate and accounting server insert by remote authentication dial-in user service receives the response to described ownership place packet data serving node return authentication result.

7. roamer's conversation release method may further comprise the steps:

Access terminal and initiate ppp link control process ends to the ownership place packet data serving node, with discharge described access terminal and the ownership place packet data serving node between connection;

Described ownership place packet data serving node is initiated the PP interface to visit ground packet data serving node and is discharged flow process, and described PP interface is the interface between packet data serving node and the packet data serving node;

Described visit ground packet data serving node is initiated the RP interface to wireless network and is discharged flow process, and described RP interface is the interface between wireless network and the packet data serving node;

8. system is set up in roamer's session connection, comprising:

Wireless network, be used for and roam into accessing terminal of visit ground setting up airlink, and set up RP and is connected, finishes ppp link with visit ground packet data serving node and control and the PPP authentication, described RP is connected to being connected between wireless network and the packet data serving node;

Visit ground packet data serving node, be used to obtain the IP address of ownership place packet data serving node, and set up PP according to the IP address of described ownership place packet data serving node with described ownership place packet data serving node and be connected, described PP is connected to being connected between packet data serving node and the packet data serving node;

The ownership place packet data serving node, be used for connecting heavily negotiation flow process and the PPP authorizing procedure of controlling with the described initiation ppp link that accesses terminal by PP, and described accessing terminal inserted request authentication, after the access request authentication is passed through, by PPP IP address control flow is the described distributing IP address that accesses terminal, and sets up described accessing terminal and being connected of described ownership place packet data serving node.

9. system is set up in roamer's session connection according to claim 8, wherein also comprises:

Visit ground checking, mandate and accounting server, be used to receive and transmit the remote authentication dial-in user service access request message of described visit ground packet data serving node transmission to ownership place checking, mandate and accounting server, and behind the IP address that receives the described ownership place packet data serving node that described ownership place checking, mandate and accounting server return, the IP address of described ownership place packet data serving node is sent to described visit ground packet data serving node;

Ownership place checking, mandate and accounting server, be used for inserting the IP address of request message inquiry and the described ownership place packet data serving node that accesses terminal corresponding according to described remote authentication dial-in user service, and by remote authentication dial-in user service insert receive the response to described visit checking, mandate and accounting server return the IP address of described ownership place packet data serving node.

10. system is set up in roamer's session connection according to claim 8, and wherein said visit ground packet data serving node also comprises:

Identity reading module is used for reading the international mobile subscriber identity that RP connects the registration message when setting up;

The address lookup module is used for inquiring about the IP address of the address mapping table that the is pre-stored in described visit ground packet data serving node ownership place packet data serving node corresponding with described international mobile subscriber identity.

11. system is set up in roamer's session connection according to claim 8, wherein said visit ground packet data serving node also comprises:

IP address comparison module, be used for behind the IP address that obtains the ownership place packet data serving node, whether more described visit ground packet data serving node its own IP address is identical with the IP address of described ownership place packet data serving node, be then directly to connect, otherwise continue to set up the PP step of connecting with described ownership place packet data serving node with described accessing terminal.

12. roamer's session delivery system comprises:

Access terminal, be used for initiating ppp link control process ends to the ownership place packet data serving node, with discharge described access terminal and the ownership place packet data serving node between connection;

The ownership place packet data serving node, be used for discharge described access terminal and the ownership place packet data serving node between connection after, initiate the PP interface to visit ground packet data serving node and discharge flow process, described PP interface is the interface between packet data serving node and the packet data serving node;

Visit ground packet data serving node is used for after the PP interface discharges flow process, initiates the RP interface to wireless network and discharges flow process, and described RP interface is the interface between wireless network and the packet data serving node;