CN1306762C - Method of keeping IP address of CDMA2000 incorporated WLAN user on cross-network switchover - Google Patents

Abstract

The present invention discloses a method of keeping an IP address constant of a CDMA2000 incorporated WLAN user on cross-network switchover. When the user is firstly accessed in a WLAN or a CDMA2000, a PDSN can establish an inquiry index according to the addresses of an IMSI and an MAC of the user. Therefore, when the user is switched to the WLAN network in cross-network way, and the accessing record of the CDMA2000 of the user is inquired according to the IMSI in AAA accessing response message, or when the user is switched to the CDMA2000 in the cross-network way, and the accessing record of the WLAN of the user is inquired according to the address of the MAC or the known IMSI in the AAA accessing response message, through explanation, the user is the cross-network switching user. The IP address used in the original network connection is assigned to the user, and therefore, the purpose of keeping the IP address constant on the cross-network switchover is achieved. The method of keeping an IP address constant of a CDMA2000 incorporated WLAN user on cross-network switchover avoids the problems of alternative route, etc. brought by the technology of mobile IP and has the advantages of simplicity and reliability.

Description

The method of keeping IP address unchanged when WLAN converges CDMA2000 users switching between networks

technical field

The invention relates to the field of CDMA2000 and wireless local area network (WLAN) packet data services, in particular to a method for processing IP addresses of WLAN-integrated CDMA2000 users when switching across networks.

Background technique

Wireless local area network (Wireless LAN, hereinafter referred to as WLAN) can provide wider bandwidth than cellular communication system within a certain range. For example, IEEE 802.11b operating at 2.4GHz frequency can provide 11Mbps bandwidth, while IEEE 802.11 operating at 5GHz frequency a can provide a bandwidth of 54Mbps. WLAN has the characteristics of low price, flexible networking, support for high-speed wireless data access, and open frequency bands. As one of the 3G standards, the CDMA2000 network can provide users with a packet bandwidth of 153.6Kpbs in a wider range. When the CDMA2000 network develops to the stage of EV-DO and EV-DV, the user's packet access rate will reach 2 ~4Mbps. In order to enable users to obtain packet data access services with higher bandwidth and wider coverage, the integration of WLAN networks and CDMA2000 networks has become an inevitable development trend. The integration of the two networks will complement each other's advantages and complement each other. In the process of the two kinds of network integration, WLAN network access is generally used as a supplement to the CDMA2000 network access method.

In the CDMA2000 network, the packet data serving node (Packet Data Serving Node, hereinafter referred to as PDSN) undertakes the packet data access service function, and the WLAN network and CDMA2000 network integration solution introduces the WLAN network access gateway function into the PDSN, so that the PDSN will It also supports packet access services for CDMA2000 users and WLAN users. The PDSN mentioned in the present invention refers to an access gateway that simultaneously supports access of WLAN network users and CDMA2000 network users.

The system architecture diagram of the WLAN network and CDMA2000 network integration solution is shown in Figure 1. Dual-mode terminals 11 and 16 are connected to the PDSN through base station/transceiver 12, base station controller 13 or through access point 17 and access point gateway 18. 19. The PDSN 19 is connected to the application server 20, the camping system 21 and the authentication, authorization, and accounting server (AAA server for short) 22 through the IP network. The base station controller 13 is also connected to a mobile switching center 14 which is connected to a home location register 15,

Apply the perfect authentication, billing mechanism and mature business model of the CDMA2000 network to the WLAN network, users can use the WLAN access method within the coverage of the WLAN network, and enjoy the high-speed wireless data access brought by the WLAN network service, use the CDMA2000 access method in the non-WLAN coverage area, and enjoy the convenience of the ultra-wide coverage provided by the CDMA2000 network. For the method of switching between the two networks, refer to Chinese patent application CN 03156356.2 (method for mobile terminal to switch between code division multiple access system and wireless local area network) and CN 200310100535.8 (a kind of user access method that realizes the combination of CDMA system and wireless local area network) Content.

Usually, WLAN users use the PPPoE dial-up mode when accessing the packet network, while CDMA2000 network users use the PPP dial-up mode when accessing the packet network. When users switch from the WLAN network to the CDMA2000 network, or from the CDMA2000 network to the WLAN network, due The communication link between PDSNs needs to be re-established, so the IP address assigned by the PDSN to the terminal will generally change, so that all communication connections of the terminal will be interrupted. When WLAN merges with CDMA2000 users and handover occurs across networks, how to ensure that the users' IP addresses remain unchanged before and after the cross-network handover is a major technical obstacle for the integration of WLAN networks and CDMA2000 networks.

In order to ensure that the user's IP address does not change when the WLAN converged CDMA2000 user is handed over across networks, the most commonly used method in the industry is to use the mobile IP technology, that is, the PDSN assumes the function of the foreign agent (Foreign Agent, FA for short) of the mobile IP. Even if the user switches across the network, the corresponding home agent (Home Agent, hereinafter referred to as HA) remains unchanged. The HA is responsible for assigning IP addresses to users, and at the same time assumes the function of a router for communication between users and the home network. Because the HA has not changed, the IP address allocated by the HA to the terminal may also remain unchanged. But this scheme has the following disadvantages:

All messages sent to the terminal need to be routed by the home agent. There are serious circuitous routing problems in the network, and the utilization efficiency of the network is low;

The burden of the home agent is heavy, and all messages sent to the terminal need to be routed through HA;

There are still many technical obstacles in mobile IP technology, and the conditions for large-scale use are not yet available.

Contents of the invention

Aiming at the above shortcomings of the prior art, the technical problem to be solved by the present invention is to propose a method for keeping the IP address unchanged when WLAN converged CDMA2000 users switch between networks, which is simple and reliable, and does not require detours.

In order to solve the above-mentioned technical problems, the present invention provides a kind of WLAN fusion CDMA2000 user and keeps the IP address constant method when switching from CDMA2000 cross-network to WLAN, comprises the following steps:

(a) The user accesses the WLAN packet network;

(b) PDSN performs access authentication of the user to the AAA server;

(c) For WLAN converged CDMA2000 users, the AAA server carries the user's IMSI in the access authentication response message sent;

(d) PDSN judges whether the IMSI of the user is carried in the access authentication response message, if yes, execute the next step, otherwise, execute step (h);

(e) PDSN queries the user's CDMA2000 access record according to the IMSI, if found, executes the next step, otherwise, executes step (g);

(f) PDSN redistributes the IP address used by the user before switching to the user, establishes the IMSI index of the user, and ends;

(g) PDSN allocates a new IP address for the user, establishes the IMSI index of the user, and ends;

(h) PDSN allocates a new IP address for the user, establishes the MAC address index of the user, and ends.

When an IP address is assigned to a user by the AAA server in the system, in the step (c), the AAA server also assigns a new IP address to the user, and in the steps (g) and (h), again This new IP address is assigned to the user by the PDSN, and in the step (f), the PDSN does not use the IP address assigned by the AAA server, but still assigns the user the IP address used before the user switches, And it can send an accounting termination message corresponding to the IP address but the accounting information is 0 to the AAA server, so as to speed up the release of the IP address.

In order to judge whether the user is switched by the MAC address, in the steps (f) and (g), an index of the user's MAC address can also be established.

In order to solve the above-mentioned technical problems, the present invention also provides a kind of WLAN fusion CDMA2000 user and keeps the IP address constant method when switching from WLAN cross-network to CDMA2000, comprises the following steps:

(a) User access to CDMA2000 packet network;

(b) PDSN performs access authentication of the user to the AAA server;

(c) For a WLAN converged CDMA2000 user, the AAA server carries the user's WLAN access capability information, such as a MAC address, in the access authentication response message sent out, which may be valid or invalid;

(d) PDSN judges whether there is the WLAN access capability information of the user in the access authentication response message, if yes, execute the next step, otherwise execute step (g);

(e) PDSN inquires the access record of its WLAN network according to the IMSI or MAC address of the user, if found, perform the next step, otherwise, perform step (g);

(f) PDSN redistributes the IP address used by the user before switching to the user, establishes the IMSI index of the user, and ends;

(g) The PDSN allocates a new IP address for the user, establishes the IMSI index of the user, and ends.

When the MAC address information is recorded in the user account, in the step (c), the AAA server returns information that can include the user's effective MAC address, and in the steps (f) and (g), also establish the user's MAC address index.

When in the system, the AAA server distributes the IP address for the user, in the step (c), the AAA server also distributes a new IP address for the user, and in the step (g), the PDSN then assigns the IP address to the user. A new IP address is assigned to the user, and in the step (f), the PDSN does not adopt the IP address assigned by the AAA server, but still assigns the IP address used before the user switches to the user, and can send the IP address to the AAA The server sends an accounting termination message corresponding to the IP address but the accounting information is 0, so as to speed up the release of the IP address.

When the system is by the AAA server to distribute the IP address for the user, the present invention also provides a method for keeping the IP address constant when the WLAN merged CDMA2000 user switches to CDMA2000 from WLAN cross-network, including the following steps:

(a) User access to CDMA2000 packet network;

(b) PDSN queries the user's WLAN access record according to the user's IMSI. If it is found, it means that the user is an inter-network handover user. When performing the user's access authentication to the AAA server, the AAA server is notified not to allocate If the IP address cannot be found, notify the AAA server to assign an IP address to the user when performing access authentication to the AAA server;

(c) For a WLAN converged CDMA2000 user, the AAA server carries the WLAN access capability information of the user in the access authentication response message sent;

(d) PDSN judges whether there is the WLAN access capability information of the user in the access authentication response message, if yes, execute the next step, otherwise execute step (g);

(e) If it is judged in step (b) that the user is an inter-network switching user, perform the next step, otherwise, perform step (g);

(f) PDSN redistributes the IP address used by the user before switching to the user, establishes the IMSI index of the user, and ends;

(g) The PDSN allocates a new IP address for the user, establishes the IMSI index of the user, and ends.

When the MAC address information is recorded in the user account, in the step (c), the AAA server returns information containing the effective MAC address of the user, and in the steps (f) and (g), the MAC address of the user is also established. address index.

As can be seen from the above, the method provided by the present invention can ensure that the same IP address is allocated for WLAN fusion CDMA2000 users when switching across networks at the PDSN, avoiding problems such as detours caused by the use of mobile IP technology, simple and reliable, and following the existing There are technical standards.

Description of drawings

Figure 1 describes the system architecture diagram of the existing WLAN network and CDMA2000 network convergence solution.

Fig. 2A and Fig. 2B are flow charts of IP address allocation by PDSN when WLAN converged CDMA2000 users access packet network according to the embodiment of the present invention.

FIG. 3 is a sequence diagram of a terminal data connection establishment process when a WLAN converged CDMA2000 user switches from a WLAN network to a CDMA2000 network according to an embodiment of the present invention.

FIG. 4 is a sequence diagram of a terminal data connection establishment process when a WLAN converged CDMA2000 user switches from a CDMA2000 network to a WLAN network according to an embodiment of the present invention.

Detailed ways

In the present invention, PDSN regards International Mobile Station Identity (International Mobile Station Identity, hereinafter referred to as IMSI) as the equipment identification of WLAN converged CDMA2000 users accessing CDMA2000 network, and the Media Access Control (Media Access Control, hereinafter referred to as MAC) of WLAN network card The address is used as the device identifier for WLAN converged CDMA2000 users to access the WLAN network. For WLAN converged CDMA2000 users, they have the right to access both networks. Its account in the AAA (Authentication, Authorization, and Accounting, hereinafter referred to as AAA) server database records the user's username, IMSI and whether it has access to the WLAN network. If you know the MAC address of the user's WLAN network card, you can also record the MAC address in the user account, which is related to the specific policy adopted by the system.

When a user accesses a packet network, both the access server and the AAA server can assign an IP address to the user, but both are notified to the terminal by the PDSN during the IPCP phase of the PPP session. For the convenience of description, the IP address is assigned by the PDSN in the following embodiments described in a way.

The flow chart of this embodiment is shown in Figure 2A and Figure 2B, including the process of allocating IP addresses when WLAN converged CDMA2000 users access the WLAN packet network and CDMA2000, as shown in the figure, including the following steps:

Step 100, the user accesses the packet network;

Step 110, the PDSN judges whether the user accesses the WLAN packet network, and if so, executes the next step, otherwise it indicates that the user accesses CDMA2000, and executes step 300;

Step 120, the PDSN performs access authentication to the AAA server according to the user name and password;

Step 130, to the WLAN fusion CDMA2000 user, AAA carries the IMSI of this user in the RADIUS access authentication reply message that sends out, then does not carry to common user (referring to this user does not possess the access ability of CDMA2000);

Step 140, PDSN judges whether it is a WLAN converged CDMA2000 user according to whether the IMSI of the user is carried in the RADIUS access authentication response message, if yes, perform the next step, otherwise perform step 190;

Step 150, for a WLAN-integrated CDMA2000 user, it may be handed over across networks. In the PDSN, query the user's CDMA2000 access record according to the IMSI returned by AAA. If found, it means that the user is a cross-network handover user , execute the next step, otherwise it means that the user has just connected to the WLAN packet network, and execute step 180;

Step 160, PDSN redistributes the IP address used by the user before switching to the user, and executes step 180;

Step 170, PDSN assigns a new IP address to it;

Step 180, PDSN establishes user index according to user IMSI and MAC address, finishes; Like this, just can query according to this IMSI index and MAC address index when cross-network switching occurs in next time user;

Step 190, the PDSN determines that the user is a common WLAN user, and assigns a new IP address to the user;

Step 200, establish a user index according to the MAC address of the user, and end;

When the user accesses the CDMA2000 packet network, it is assumed in the present embodiment that the user account of the AAA server contains the MAC address, and its processing flow is as follows (Fig. 2B):

Step 300, the PDSN performs access authentication to the AAA server according to the user name and password;

Step 310, for WLAN fusion CDMA2000 users, AAA carries the valid MAC address of the user in the RADIUS access authentication response message sent out, and does not carry the MAC address for ordinary users; in this step, if there is no MAC address information in the user account , for WLAN converged CDMA2000 users only return information identifying whether the user has access capabilities, for example, an invalid MAC address, such as 00-00-00-00-00-00 or FF-FF-FF-FF-FF-FF .

Step 320, the PDSN judges whether the user's WLAN integrates CDMA2000 according to whether the user's WLAN access capability information is carried in the RADIUS access authentication response message (this embodiment refers to whether it has a MAC address, which can be valid or invalid). User, if yes, execute the next step, otherwise, execute step 390;

Step 330, for a WLAN-integrated CDMA2000 user, it may be handed over across networks. In the PDSN, query the user's WLAN network access record according to the MAC address or IMSI returned by AAA. If found, it means that the user is Switch the user across the network, execute the next step, otherwise it means that the user has just connected to the CDMA2000 packet network, and execute step 350; it should be noted that if no valid MAC address is returned in the AAA, then only query according to the IMSI;

Step 340, PDSN redistributes the IP address used by the user before switching to the user, and executes step 360;

Step 350, PDSN allocates a new IP address for the user;

Step 360, PDSN judges whether the MAC address returned by the AAA server is valid, if yes, execute the next step, otherwise execute step 380;

Step 370, the PDSN establishes a user index according to the user IMSI and MAC address, and ends; in this way, when the next time the user is handed over across the network, it can be queried according to the IMSI index or the MAC address index;

Step 380, the PDSN only establishes a user index according to the IMSI of the user, and ends;

Step 390, the PDSN judges that the user is a common CDMA2000 user, and assigns a new IP address to the user;

In step 400, the PDSN only establishes an index according to the IMSI of the user, and ends.

The following describes the specific access process of a WLAN converged CDMA2000 user switching from a WLAN network to a CDMA2000 network in conjunction with the sequence diagram in FIG. 3 .

The user first accesses the WLAN, and the specific access process is as follows:

Establish a WLAN network wireless connection between the access terminal (Access Terminal, hereinafter referred to as AT) and the access point (Access Point, hereinafter referred to as AP) of the WLAN network;

An R-P session is established for the user between the Access Point Gateway (APGW for short) and the PDSN;

Then start to establish a PPP session between the AT and the PDSN;

After the LCP negotiation of the PPP session is completed, the PDSN authenticates the AT through AAA according to the authentication request of the AT. The authentication method can be any one of PAP, CHAP, and EAP;

AAA returns a RADIUS access response message, which carries the user's IMSI for WLAN converged CDMA2000 users;

After the user passes the AAA authentication, the IPCP negotiation continues between the AT and the PDSN. According to the IMSI in the RADIUS access response message returned by AAA, the PDSN can determine that the user is a WLAN converged CDMA2000 user. Since the user has just connected, the PDSN cannot find out the user's CDMA2000 access record based on the IMSI. PDSN will establish the binding relationship between IMSI and MAC for the user, and establish the IMSI and MAC index for the user, and then PDSN will assign a new IP address to the user in the IPCP phase of PPP. Since then, the WLAN will integrate the WLAN network of the CDMA2000 user The connection is established successfully;

PDSN sends accounting start message to AAA.

When the user moves out of the service range of the WLAN network and is in the service range of CDMA2000, the user has the conditions for cross-network handover.

When switching from WLAN to CDMA2000, the specific access process is as follows:

Establish wireless connection between AT and CDMA2000 wireless network, and allocate wireless service channel;

An R-P session is established for the user between the Packet Control Function (PCF) and the PDSN;

Then a PPP session will be established between AT and PDSN;

After the negotiation of the LCP phase of the PPP session is completed, the PDSN authenticates the validity of the user to the AAA according to the authentication request of the AT. The authentication method can be any one of PAP, CHAP and EAP;

AAA returns a RADIUS access response message, carrying the user's MAC address for the WLAN converged CDMA2000 user;

After the user passes the AAA authentication, the IPCP negotiation continues between the AT and the PDSN. After querying the user's MAC address, the PDSN can determine that the user is a cross-network handover user. In this step, in fact, before the AAA authentication, the PDSN can query the access record according to the user's IMSI to determine whether the user has switched users across the network, so the query can also be performed before the authentication at this time.

After the new CDMA2000 network connection is established, the PDSN can initiate the release of the old WLAN network connection. Before that, the AT can also actively initiate the release of the WLAN network connection.

The following describes the specific access process of a WLAN converged CDMA2000 user switching from a CDMA2000 network to a WLAN network in conjunction with FIG. 4 .

The user first accesses CAMA2000, and the specific access process is as follows:

Establish a wireless connection between the AT and the CDMA2000 wireless network and establish a wireless service channel;

An R-P session is established for the user between the packet control function node (PCF) and the PDSN;

Then start the LCP phase negotiation of establishing the PPP session between the AT and the PDSN;

After finishing the LCP negotiation of the PPP session, the PDSN authenticates the AT through AAA according to the authentication request of the AT;

AAA returns a RADIUS access response message to the access authentication request, and carries a MAC address (valid or invalid) for WLAN converged CDMA2000 users;

After the user passes the AAA authentication, the IPCP negotiation continues between the AT and the PDSN. According to the RADIUS access response message, the PDSN can determine that the user is a WLAN converged CDMA2000 user, and may also know the effective MAC address of the user. Since the user has just connected, the PDSN cannot find out the user based on the IMSI or MAC address. For the user's WLAN network connection record, the PDSN will establish an IMSI index for the user. If the user's MAC address is known, the PDSN will also establish a MAC index, and then the PDSN will assign a new IP address to the user in the IPCP phase of PPP. The CDMA2000 network connection of the integrated CDMA2000 user is established successfully.

Generally speaking, the coverage of the WLAN network is included in the coverage of the CDMA2000 network, so when the user enters the service area of the WLAN network, it may still be within the coverage of the CDMA2000 network, but at this time the user has the ability to cross-network The switching condition.

Then, when switching from CDMA2000 to WLAN, the specific access process is as follows:

Establish wireless connection between AT and WLAN wireless network;

Then establish an R-P session for the user between the wireless access point gateway (APGW) and the PDSN;

Then a PPP session will be established between AT and PDSN;

After the negotiation of the LCP phase of the PPP session is completed, the PDSN authenticates the AT through AAA according to the authentication request of the AT;

AAA returns a RADIUS access response message to the access authentication request, and carries the user's IMSI to the WLAN converged CDMA2000 user;

After the user passes the AAA authentication, the IPCP negotiation continues between the AT and the PDSN. According to the IMSI returned in the RADIUS Access Response message, the PDSN can find the CDMA2000 access message of the user from the IMSI index, thereby judging that the user is a handover user. Therefore, in the subsequent IPCP negotiation phase of PPP, the PDSN will Assign the user the IP address used in the CDMA2000 network connection;

After the new WLAN network connection is established, the PDSN can initiate the release of the old CDMA2000 network connection. Before that, the AT can also actively initiate the release of the CDMA2000 network connection.

To sum up, when a user accesses WLAN or CDMA2000 for the first time, the PDSN will establish a binding relationship between IMSI and MAC address for WLAN converged CDMA2000 users, and establish a query index based on IMSI and MAC address. In this way, when the user switches to the WLAN network across the network and queries the user's CDMA2000 access record according to the IMSI in the AAA access response message, or the user switches to CDMA2000 across the network and When the user's WLAN access record is queried by the address or the known IMSI, it means that the user is a cross-network switching user. change purpose. The method of the invention avoids problems such as circuitous routes brought about by adopting the mobile IP technology, and is simple and reliable.

The present invention can also have various transformations on the basis of the above-mentioned embodiments. For example, when a user accesses CDMA2000 and the system assigns an IP address by AAA, the PDSN can also query its WLAN through the user's IMSI before authenticating to AAA. If found, it indicates that the user is a cross-network switching user, and the PDSN can notify AAA not to assign an IP address in the authentication request message; if not found, notify AAA to assign an IP address.

Correspondingly, for a WLAN converged CDMA2000 user, the AAA server still carries the WLAN access capability information of the user in the access authentication response message sent;

When the PDSN judges that the WLAN access capability information of the user is included in the access authentication response message, if it has been judged to be an inter-network handover user during the query, it will reassign the IP address used by the user before the handover to the user, and establish The user's IMSI and MAC address index; if the user is not a cross-network handover, assign a new IP address to the user, and establish the user's IMSI and MAC address index;

If the PDSN judges that there is no WLAN access capability information of the user in the access authentication message, it allocates a new IP address for the user, establishes the IMSI index of the user, and ends.

When the work of assigning IP addresses to users is completed by AAA, if the PDSN knows that the user is a cross-network handover user after authenticating the user, AAA has assigned a new IP address to the user at this time, but the PDSN will do so in the subsequent During IP address negotiation in the IPCP phase of PPP, the IP address used in the old network connection is still used instead of the IP address assigned by AAA. In order to enable AAA to expedite reclaiming the allocated but unused IP address, the PDSN can send an accounting termination message corresponding to the IP address but with the accounting information being 0 to the AAA.

In addition, if the work of assigning IP addresses to users is done by AAA, AAA does not need to judge whether the user has switched across networks, and this work is still done by PDSN.

Claims (11)

1, a kind of WLAN fusion CDMA2000 user keeps the constant method in IP address when the CDMA2000 inter-network switches to WLAN, may further comprise the steps:

(a) user inserts the WLAN packet network;

(b) PDSN carries out this user's access authentication to aaa server;

(c) WLAN is merged CDMA2000 user, aaa server carries this user's IMSI in the access authentication response message that sends;

(d) PDSN judges the IMSI that whether carries this user in the described access authentication response message, if, carry out next step, otherwise, execution in step (h);

(e) PDSN inquires about the access record of this user's CDMA2000 according to described IMSI, if find, carries out next step, otherwise, execution in step (g);

(f) the IP address of use was redistributed to this user before PDSN switched this user, set up this user's IMSI index, finished;

(g) PDSN sets up this user's IMSI index for this user distributes a new IP address, finishes;

(h) PDSN sets up this user's MAC Address index for this user distributes a new IP address, finishes.

2, the method for claim 1, it is characterized in that, in the described step (c), aaa server also distributes a new IP address for this user, in described step (g) with (h), give this user by PDSN with this new IP address assignment again, and in described step (f), PDSN does not adopt the aaa server IP address allocated, will described this user switch the preceding IP address assignment of using to this user.

3, method as claimed in claim 2 is characterized in that, in the described step (f), when PDSN does not adopt the aaa server IP address allocated, also sends one corresponding to this IP address but charge information is 0 charging stops message to aaa server.

4, the method for claim 1 is characterized in that, described step (f) and (g) in, also set up this user's MAC Address index.

5, a kind of WLAN fusion CDMA2000 user keeps the constant method in IP address when the WLAN inter-network switches to CDMA2000, may further comprise the steps:

(a) user inserts the CDMA2000 packet network;

(b) PDSN carries out this user's access authentication to aaa server;

(c) WLAN is merged CDMA2000 user, aaa server carries this user's WLAN access capability information in the access authentication response message that sends;

(d) PDSN judges the WLAN access capability information whether this user is arranged in the described access authentication response message, if having, carries out next step, otherwise execution in step (g);

(e) the PDSN access record of inquiring about its wlan network according to this user's IMSI or MAC Address if find, is carried out next step, otherwise, execution in step (g);

(f) the IP address of use was redistributed to this user before PDSN switched this user, set up this user's IMSI index, finished;

(g) PDSN sets up this user's IMSI index for this user distributes a new IP address, finishes.

6, method as claimed in claim 5 is characterized in that, in the described step (c), comprises this user's efficient MAC address in the aaa server return information, described step (f) and (g) in, also set up this user's MAC Address index.

7, method as claimed in claim 5, it is characterized in that, in the described step (c), aaa server also distributes a new IP address for this user, in described step (g), give this user by PDSN with this new IP address assignment again, and in described step (f), PDSN does not adopt the aaa server IP address allocated, will described this user switch the preceding IP address assignment of using to this user.

8, method as claimed in claim 7 is characterized in that, in the described step (f), when PDSN does not adopt the aaa server IP address allocated, also sends one corresponding to this IP address but charge information is 0 charging stops message to aaa server.

9, method as claimed in claim 5 is characterized in that, the access capability information in the described step (c) refers to effective or invalid MAC Address.

10, a kind of WLAN fusion CDMA2000 user keeps the constant method in IP address when the WLAN inter-network switches to CDMA2000, may further comprise the steps:

(a) user inserts the CDMA2000 packet network;

(b) PDSN inquires about the access record of its WLAN according to user's IMSI, if find, illustrate that this user is that inter-network is switched the user, when aaa server carries out this user's access authentication, the notice aaa server is not this user's distributing IP address, if can not find out, be this user's distributing IP address then at notice aaa server when aaa server carries out access authentication;

(c) WLAN is merged CDMA2000 user, aaa server carries this user's WLAN access capability information in the access authentication response message that sends;

(d) PDSN judges the WLAN access capability information whether this user is arranged in the described access authentication response message, if having, carries out next step, otherwise execution in step (g);

(e) if judging this user in step (b) is that inter-network is switched the user, carry out next step, otherwise, execution in step (g);

(f) the IP address of use was redistributed to this user before PDSN switched this user, set up this user's IMSI index, finished;

(g) PDSN sets up this user's IMSI index for this user distributes a new IP address, finishes.

11, method as claimed in claim 10 is characterized in that, in the described step (c), comprises this user's efficient MAC address in the aaa server return information, described step (f) and (g) in, also set up this user's MAC Address index.

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