CN101400089A - Method, network entity and terminal for switching between heterogeneous wireless networks - Google Patents

Abstract

The embodiment of the present invention discloses a method for switching between heterogeneous wireless networks. In order to solve the problem that the fast switching of heterogeneous networks cannot be realized when the mobile node is switched between heterogeneous networks, the method includes the mobile node determining the pre-authentication The mobile node initiates the pre-authentication of the target network according to the determined pre-authentication information. After the pre-authentication is passed, the mobile node switches between heterogeneous networks. It is because of the pre-authentication before the handover between heterogeneous wireless networks that the handover process of the mobile node in the heterogeneous network is accelerated.

Description

A method for switching between heterogeneous wireless networks, a network entity and a terminal

technical field

The invention belongs to the field of wireless communication systems, and in particular relates to a method for switching between heterogeneous wireless networks, a network entity and a terminal.

Background technique

With the development of computer and communication technology, various wireless network systems such as wireless wide area network (such as GPRS, UMTS, etc.), wireless local area network (such as IEEE802.11), satellite communication network, and Bluetooth network are gradually replacing traditional wired networks as Internet access last hop. How to integrate these heterogeneous wireless networks together to provide Internet access with wide coverage, high bandwidth, high mobility and low cost will be the development direction of the next generation of mobile communication systems (such as B3G, 4G, etc.).

In the system framework of heterogeneous wireless network integration, various wireless network systems have very good complementary characteristics, so their seamless integration has attracted extensive attention. In order to seamlessly integrate heterogeneous wireless networks and bring out the advantages of their respective networks, a series of problems need to be solved. Among them, how to maintain service continuity during the switching process is a key issue. The pure or pure IETF FMIP model in the prior art cannot simply enable the mobile node to seamlessly roam between heterogeneous networks. The main reason is that different networks require different network access methods, and switching across heterogeneous networks inevitably requires security, QoS negotiation/setting and many other issues. When the mobile node is handed over between heterogeneous networks, the fast handover of heterogeneous networks cannot be realized.

Contents of the invention

In order to solve the problem that fast handover of heterogeneous networks cannot be realized when the mobile node is handed over between heterogeneous networks, an embodiment of the present invention provides a method for handover between heterogeneous wireless networks, including:

The mobile node determines the pre-authentication information required for pre-authentication;

The mobile node initiates pre-authentication of the target network according to the determined pre-authentication information;

After the pre-authentication is passed, the mobile node switches between heterogeneous networks.

At the same time, the embodiment of the present invention also provides a network entity for switching between heterogeneous wireless networks, including:

The first obtaining module: used to obtain pre-authentication information supported by the target network capability;

The first delivery module: used to deliver the pre-authentication information acquired by the first acquisition module to the mobile node.

At the same time, the embodiment of the present invention also provides a network entity for switching between heterogeneous wireless networks, including:

Receiving module: used to receive the pre-authentication information reported by the mobile node for its capability support;

Selection module: used to select according to the pre-authentication information received by the receiving module, select the pre-authentication information matching the mobile node, and provide the selected pre-authentication information to the second delivery module;

The second sending module: used for notifying the mobile node of the pre-authentication information provided by the selecting module.

At the same time, the embodiment of the present invention also provides a network entity for switching between heterogeneous wireless networks, including:

The second obtaining module: used to obtain the pre-authentication information supported by the mobile node capability;

The transfer module: used to transfer the pre-authentication information acquired by the acquisition module to the target network entity through the context transfer mechanism.

At the same time, the embodiment of the present invention also provides a mobile node for handover between heterogeneous wireless networks, including:

Determination module: used to determine the pre-authentication information required for pre-authentication;

A pre-authentication module: used to initiate pre-authentication of the target network according to the pre-authentication information determined by the determination module;

Switching module: used to switch between heterogeneous networks according to the pre-authentication passing information provided by the pre-authentication module.

It can be seen from the specific implementation scheme provided by the present invention above that the handover process of the mobile node in the heterogeneous network is accelerated because of the pre-authentication before the handover between the heterogeneous wireless networks.

Description of drawings

Fig. 1 is the method flowchart of the first embodiment provided by the present invention;

Fig. 2 is the method flowchart of the second embodiment provided by the present invention;

Fig. 3 is the method flowchart of the third embodiment provided by the present invention;

FIG. 4 is a flow chart of a method for performing a pre-authentication process in the method of the third embodiment provided by the present invention;

FIG. 5 is a network entity structure diagram of a fourth embodiment provided by the present invention;

FIG. 6 is a network entity structure diagram of a fifth embodiment provided by the present invention;

FIG. 7 is a network entity structure diagram of the sixth embodiment provided by the present invention;

FIG. 8 is a structural diagram of a mobile node according to the seventh embodiment of the present invention.

Detailed ways

In order to accelerate the handover process of the mobile node through pre-authentication when the mobile node is handed over between heterogeneous networks, the first embodiment provided by the present invention is a method for handover between heterogeneous wireless networks. Prepare to switch between structured wireless networks, such as a MN (Mobile Node mobile node) moves out of the coverage area of the wireless local area network AP, and enters the base station coverage area of the wireless wide area network to prepare for switching. The method flow is shown in Figure 1, including:

Step 101: A network-side entity (such as an AP) of a service network (such as a wireless local area network) issues pre-authentication information about capability support of a target network (such as a wireless wide area network) to the MN.

Step 102: The MN determines the matching pre-authentication information according to the pre-authentication information issued by the network side entity, and initiates the pre-authentication of the target network.

Step 103: After passing the pre-authentication, the MN switches between heterogeneous networks.

According to the above steps, it can be seen that before the MN performs handover between heterogeneous wireless networks, the MN obtains the pre-authentication information about the capability support of the target network, and performs pre-authentication, which accelerates the handover process of the mobile node in the heterogeneous network .

The pre-authentication information is: the parameter and capability information sets that need to be pre-negotiated during the pre-handover process. The pre-authentication information about the target network issued by the network side entity of the serving network to the MN may be any one or combination of the following:

The access type of the target network: such as Wifi, Wimax, 3GPP, 3GPP2, etc.;

The access authentication method of the target network: such as EAP, X.509, etc.;

The key generation algorithm required by the target network: such as MD5, SHA, etc.;

Whether the target network supports pre-authentication: Yes or No.

The specific delivery can be implemented through router advertisement messages, DHCP messages, PPP messages, EAP messages, media-independent messages or dedicated pre-authentication signaling.

The second embodiment provided by the present invention is a method for switching between heterogeneous wireless networks. When the MN is preparing to switch between heterogeneous wireless networks, the method flow is shown in FIG. 2 , including:

Step 201: The network side entity of the serving network receives the pre-authentication information of the target network supported by the MN capability reported by the MN.

Step 202: The network side entity of the serving network selects the pre-authentication information supported by the target network capability according to the pre-authentication information of the target network reported by the MN, selects only the pre-authentication information of the target network supported by the MN capability, and sends it to MN. Or the network-side entity only sends a confirmation message to the MN, indicating that the pre-authentication information of the target network sent to the MN by the network-side entity of the serving network is the same as the pre-authentication information of the target network reported by the MN.

Step 203: The MN obtains the matching pre-authentication information according to the pre-authentication information or confirmation information issued by the network side entity, and initiates the pre-authentication of the target network.

Step 204: After passing the pre-authentication, the MN switches between heterogeneous networks.

Because the MN first actively reports the pre-authentication information of the target network supported by its capabilities, the network-side entity of the serving network can choose according to the information actively reported by the mobile node, and only select the pre-authentication information of the target network that matches the MN and send it to the MN , using this method, the MN can determine by default that the pre-authentication information issued by the network-side entity is the pre-authentication information that matches it. In this way, the network side entity does not need to send all the information matching or not matching with the MN to the MN, so that the MN can confirm the selection.

In step 201, the MN reports the pre-authentication information of the target network supported by its capabilities, including: such as the access type of the target network, the access authentication method of the target network, the key generation algorithm required by the target network, whether the target network supports pre-authentication and related information. Any one or combination of authentication priorities, such as: the MN reports the supported information: the access type of the target network: Wimax, 3GPP; the access authentication method of the target network: EAP; the key generation algorithm required by the target network : MD5; Whether the target network supports pre-authentication: Yes.

In step 202, the network side entity of the service network obtains the pre-authentication information of the target network such as: "The access type of the target network: Wifi, Wimax, 3GPP, 3GPP2; the access authentication method of the target network: EAP, X.509; The key generation algorithm required by the target network: MD5, SHA; whether the target network supports pre-authentication: Yes or No", select the information that matches the supported pre-authentication information reported by the MN: "Target network access Type: Wimax, 3GPP; the access authentication method of the target network: EAP; the key generation algorithm required by the target network: MD5; whether the target network supports pre-authentication: yes", and through the router notification message, DHCP (Dynamic host configuration protocol dynamic Host Configuration Protocol) message, PPP (Point to point Protocol) message, EAP (Extensible Authentication Protocol Extensible Authentication Protocol) message, media-independent message or dedicated pre-authentication signaling, etc. Input type: Wimax, 3GPP; access authentication method of the target network: EAP; key generation algorithm required by the target network: MD5; whether the target network supports pre-authentication: Yes" and send it to the MN. The media-independent messages include, but are not limited to: media-independent network information acquisition messages or media-independent network query messages.

In the above example, the pre-authentication information of the target network that the MN reports its capability support can also be any one or combination of the following:

The access type of the target network: such as Wifi, Wimax, 3GPP, 3GPP2, etc.;

The access authentication method of the target network: such as EAP, X.509, etc.;

The key generation algorithm required by the target network: such as MD5, SHA, etc.;

Whether the target network supports pre-authentication: Yes or No.

For example, the pre-authentication information of the target network supported by the MN may only include: "The access type of the target network is Wimax and supports pre-authentication, and the access authentication method of the target network and the key generation algorithm required by the target network, It can be determined by default according to the predetermined policy according to the access type of the target network. The specific implementation manner may be different in different applications, and will not be repeated here.

In step 204, when the MN performs handover between heterogeneous networks, a predictive handover process or a reactive handover process may be adopted.

According to the above two embodiments, it can be seen that whether it is the technical solution that the network side entity of the serving network sends the MN the pre-authentication information supported by the target network capability in the first embodiment, or the MN reports the pre-authentication The technical solution of authentication information is a specific implementation method for the mobile node to determine the pre-authentication information required for pre-authentication. After the mobile node determines the pre-authentication information according to the method in embodiment 1 or embodiment 2, or the MN also After the pre-authentication information can be determined through information exchange with the core network entity, the pre-authentication of the target network can be initiated. After the pre-authentication is passed, the mobile node can quickly switch between heterogeneous networks.

When the MN works in a heterogeneous network, it moves frequently and often switches between different networks. When the MN switches between heterogeneous networks, the network side entity of the service network transfers the mobile node to the target network entity through the context transfer mechanism. The pre-authentication information supported by the capability, the target network entity selects the pre-authentication information matching the MN according to the pre-authentication information supported by the MN capability, and notifies the MN of the selected pre-authentication information. The specific transfer mechanism includes a media-independent handover resource query request message, a handover instruction, or other context transfer mechanisms. This method can also enable the MN to obtain the pre-authentication information of its matched target network. When the target network entity notifies the MN of its selected pre-authentication information, it can be forwarded by the network-side entity of the serving network. At this time, the network-side entity of the serving network only forwards the pre-authentication information without any other processing, namely By notifying the network-side entity of the serving network first, and then in the serving network, the network-side entity of the serving network notifies the MN of the pre-authentication information selected by the target network entity, or the target network entity directly notifies the MN of the pre-authentication information selected by it .

The MN may not interact with the service network or the target network to confirm the pre-authentication information, but directly uses the pre-authentication information supported by the MN's own capabilities as the pre-authentication information required for pre-authentication, and then initiates the pre-authentication of the target network. It may exist that the pre-authentication information supported by the mobile node capability is incompatible with the pre-authentication information supported by the target network capability. The incoming authentication method is X.509. In this case, the target network entity will send a message to the mobile node to indicate that the pre-authentication information is not compatible with each other, and the MN knows that it cannot achieve pre-authentication with the target network. The MN can initiate pre-authentication to the new target network.

Of course, if the MN interacts with the service network or the target network to confirm the pre-authentication information according to the methods mentioned in the foregoing embodiments or other methods, it may also be incompatible with the pre-authentication information of the target network. In this case, the target network The network entity will send a message to the MN indicating that the pre-authentication information is incompatible with each other. At this time, the MN also knows that it cannot achieve pre-authentication with the target network, and can initiate pre-authentication to a new target network.

Further description will be given below in conjunction with the fast MIP switching process supporting fast pre-authentication of IEEE802.21. Fast MIP switching process, including predictive and reactive. However, no matter which method is used, when combined with IEEE802.21, the pre-authentication process should be completed first, and then the subsequent MIP fast switching process should be implemented if it is successful. The following takes the predictive fast MIP switching process as an example to illustrate this process.

The third embodiment provided by the present invention is a method for switching between heterogeneous wireless networks. The method flow is shown in FIG. 3 , including:

Step 301: MN (such as the Mobile Node in Figure 3, where MIHF is a functional module of the Mobile Node) obtains the surrounding neighbor networks (including the target network described above) from the information server (such as the MIIS Server in Figure 3) Entities, such as the information of Candidate Network1) in Figure 3. The message adopted at this time is a media-independent acquisition network information message.

Step 302: The MN initiates a resource query request to the candidate network (Candidate Network1), ie, the corresponding target network entity mentioned above, to query the resource availability of the candidate network. The message used at this time is the media-independent network query message.

Step 303: the route discovery process of the MN and the serving network (such as the Servering Network in Figure 3). Optionally, the mobile node may send active routing request signaling to the serving network to request the serving network to send an agent routing notification message to the MN (this step may be performed simultaneously with the resource availability query).

In step 301, step 302 or step 303, the MN and the network side entity have information interaction. Using these information as a carrier, and on the basis of these information exchanges, the completion of step 101 in the first embodiment above can be realized: the network side entity of the service network sends pre-authentication information to the MN. Or what is done in step 201 and step 202 in embodiment 2: the MN reports and pre-authentication information, and the network side entity selects according to the pre-authentication information reported by the MN, and only selects the pre-authentication information of the target network supported by the MN capability , and send it to the MN. The above example is just a preferred solution, and this solution is not limited to a specific signaling, any signaling that can carry the pre-authentication information about the target network sent to the MN by the network side entity of the serving network in step 101, Support for this solution can be achieved. Through the above description, those skilled in the art can modify specific signaling according to the application environment during the specific implementation process, or customize new dedicated pre-authentication signaling to support this solution. The pre-authentication information to be interactively determined in step 201 and step 202 is also not limited to specific signaling, and will not be repeated here.

Step 304: The mobile node selects a handover target network.

The following steps 305, 306, and 307 are not required to be performed sequentially, but from the perspective of network security and pre-authentication, it is recommended to perform steps 306 and 307 after completing step 305.

Step 305: the mobile node performs NCoA configuration.

Step 306: According to the pre-authentication information about the target network obtained by the MN from the network side or the pre-authentication information determined by the MN through interaction with the network side, the MN and the target network perform a pre-authentication process. The specific pre-authentication process is transparent to the bottom layer. The IEEE802.21 signaling provides a bearer to encapsulate the upper layer authentication signaling, informs the service network through the identifier to pass it to the target network for pre-authentication, and returns the authentication result to the MN. For the specific process, we take the authentication process required for the Wimax mobile node to access the network as an example to illustrate.

Define new message MIH_MN_HO_Pre-auth.Transfer. Judging whether to process by this network or continue to transfer to the target network according to the target network information indicated therein. The specific signaling of the EAP can adopt the existing standard signaling, as shown in FIG. 4 , and the specific signaling process of the EAP is omitted. Only the beginning of the process is shown here. The main principle is to encapsulate EAP signaling in MIH_MN_HO_Pre-auth.Transfer. And then complete the pre-authentication process. When the target network determines that it belongs to the network according to the indication information, it decapsulates the EAP signaling and interacts with the AAA. until the end. Then generate the keys required by both parties. Then proceed to the subsequent network access process. Whether the mobile node is allowed to enter the target network can be learned through the successful judgment, so that a suitable network can be selected in time for access.

This process can be performed after the target network is determined, or this process can be initiated for all candidate networks before the target network is determined. The specific choice depends on the specific scene.

The specific signaling format of the MIH_MN_HO_Pre-auth.Transfer message can be:

MIH_MN_HO_Pre-auth.Transfer(

SourceIdentifier,

DestinationIdentifier,

  PreAuthenticationContainer

)

The parameters are described in Table 1:

name type describe SourceIdentifier MIHF identifier The identifier of the MIHF functional entity unit of the message originator, used to identify the originator of the message DestinationIdentifier, MIHF identifier The identity of the remote MIHF functional entity unit, used to identify the destination of the message PreAuthenticationContainer TBD Message container, used to encapsulate media-related pre-authentication messages

Table 1

After the pre-authentication is passed, the MN is handed over between heterogeneous networks through subsequent steps.

Step 307: The MN sends a handover request to the serving network, and the message carries information about pre-authentication information resources of the target network to be reserved. The serving network forwards the information to the target network, requests the target network to reserve resources, and prepares for handover. After the resource reservation and preparation by the target network are completed, the service network sends a handover response message to the MN, instructing the MN to establish a layer 2 connection to the target network.

Step 308: The MN initiates a fast mobile IP binding process to establish a data channel between the serving network and the target network. The service network performs fast binding confirmation and forwards the cached data packets to the target network.

Step 309: the MN establishes a layer 2 connection to the target network.

Step 310: The layer 2 connection is established and the link is activated.

Step 311: the MN restores the IP connection to the target network.

Step 312: the MN requests the target network to deliver the cached data packet, and the target network delivers the data packet transferred from the service network to the MN.

Step 313: MN performs MIP registration/binding update.

Step 314: After the handover is completed, the target network notifies the serving network to clear resources, and the target network becomes the current serving network of the MN.

The above steps 307 to 314 are just a preferred solution for the MN to switch between heterogeneous networks. In order to achieve switching between heterogeneous networks, the switching solutions under different mechanisms may be different, and will not be repeated here.

The fourth embodiment provided by the present invention is a network entity for switching between heterogeneous wireless networks, the structure of which is shown in Figure 5, including:

The first obtaining module 401: used to obtain pre-authentication information supported by the target network capability;

The first delivery module 402: used to deliver the pre-authentication information acquired by the first acquisition module 401 to the mobile node.

Further, the first delivery module 402 also includes a first delivery submodule 4021: for

The mobile node selects the matching pre-authentication information as the pre-authentication information required for pre-authentication;

The mobile node initiates pre-authentication of the target network according to the determined pre-authentication information;

After the pre-authentication is passed, the mobile node switches between heterogeneous networks; before

Deliver the pre-authentication information acquired by the first acquiring module 401 to the mobile node.

The fifth embodiment provided by the present invention is a network entity for switching between heterogeneous wireless networks, the structure of which is shown in Figure 6, including:

Receiving module 501: used to receive pre-authentication information reported by the mobile node for its capability support;

Selection module 502: used to select according to the pre-authentication information received by the receiving module 501, select the pre-authentication information matching the mobile node, and provide the selected pre-authentication information to the second delivery module;

The second delivering module 503: used for notifying the mobile node of the pre-authentication information provided by the selecting module 502.

Further, the second delivery module 503 also includes a second delivery submodule 5031: for

The mobile node uses the notification information as the pre-authentication information required for pre-authentication;

The mobile node initiates pre-authentication of the target network according to the determined pre-authentication information;

After the pre-authentication is passed, the mobile node switches between heterogeneous networks; before

The pre-authentication information provided by the selecting module 502 is notified to the mobile node.

The sixth embodiment provided by the present invention is a network entity for switching between heterogeneous wireless networks, the structure of which is shown in FIG. 7 , including:

The second obtaining module 601: used to obtain the pre-authentication information supported by the mobile node capability;

The delivery module 602: used to deliver the pre-authentication information acquired by the acquisition module 601 to the target network entity through a context delivery mechanism.

The further transfer module 602 also includes a transfer sub-module 6021: for

The target network entity selects the pre-authentication information that matches the mobile node according to the pre-authentication information transmitted by the network side entity of the serving network, and notifies the mobile node of the pre-authentication information selected by it;

The mobile node uses the pre-authentication information selected by the target network entity as the pre-authentication information required for pre-authentication;

The mobile node initiates pre-authentication of the target network according to the determined pre-authentication information;

After the pre-authentication is passed, the mobile node switches between heterogeneous networks; before

The pre-authentication information obtained by the obtaining module 601 is transferred to the target network entity through a context transfer mechanism.

The seventh embodiment provided by the present invention is a mobile node for handover between heterogeneous wireless networks, its structure is shown in Figure 8, including:

Determination module 701: used to determine pre-authentication information required for pre-authentication;

Pre-authentication module 702: for initiating pre-authentication of the target network according to the pre-authentication information determined by the determination module 701;

Switching module 703: for switching between heterogeneous networks according to the pre-authentication pass information provided by the pre-authentication module 702.

Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these modifications and variations.

Claims (19)

1. A method for switching between heterogeneous wireless networks, comprising: The mobile node determines the pre-authentication information required for pre-authentication; The mobile node initiates pre-authentication of the target network according to the determined pre-authentication information; After the pre-authentication is passed, the mobile node switches between heterogeneous networks. 2. The method according to claim 1, wherein the step of determining the pre-authentication information required by the mobile node during pre-authentication is specifically as follows: The mobile node receives the pre-authentication information supported by the target network capability that is issued by the network-side entity of the serving network and obtained by the network-side entity of the serving network; The mobile node selects the matching pre-authentication information as the pre-authentication information required for pre-authentication. 3. The method according to claim 2, wherein the network-side entity of the serving network sends a message to the mobile through a router advertisement message, a DHCP message, a PPP message, an EAP message, a media-independent message or a dedicated The node sends pre-authentication information. 4. The method according to claim 2 or 3, wherein the pre-authentication information issued by the network side entity of the serving network to the mobile node includes access type information of the target network, access authentication mode information of the target network, Any one or combination of key generation algorithm information required by the target network or target network pre-authentication capability information. 5. The method according to claim 1, wherein the step of determining the pre-authentication information required by the mobile node during pre-authentication is specifically as follows: The mobile node reports the pre-authentication information supported by the mobile node's capabilities to the network-side entity of the serving network; The mobile node receives notification information from the network-side entity of the serving network, and the notification information represents the pre-authentication information selected by the network-side entity of the serving network according to the pre-authentication information reported by the mobile node and matched with the mobile node; The mobile node uses the notification information as the pre-authentication information required for pre-authentication. 6. The method according to claim 5, wherein the step of the mobile node receiving the notification information from the network side entity of the serving network is specifically as follows: The mobile node receives the pre-authentication information selected by the network side entity of the serving network. 7. The method according to claim 5, wherein the step of the mobile node receiving the notification information from the network side entity of the serving network is specifically: The mobile node receives confirmation information sent by the network side entity of the serving network, and the confirmation information is used to indicate the pre-authentication information sent by the network side entity, which is the same as the pre-authentication information reported by the mobile node. 8. The method according to claim 5, characterized in that, the mobile node sends a message to the network side entity of the serving network through a router request message, a DHCP message, a PPP message, an EAP message, a media-independent message, or a dedicated pre-authentication signaling Report the pre-authentication information of the matching target network. 9. The method according to any one of claims 5 to 8, wherein the pre-authentication information reported by the mobile node to the network side entity of the serving network includes access type information of the target network, access One or a combination of authentication mode information, key generation algorithm information required by the target network, or target network pre-authentication capability information. 10. The method according to claim 1, wherein the step of determining the pre-authentication information required by the mobile node during pre-authentication is specifically as follows: The network-side entity of the serving network obtains the pre-authentication information supported by the mobile node capability; Through the context transfer mechanism, the network-side entity of the service network transfers the pre-authentication information it obtains to the target network entity; The target network entity selects the pre-authentication information that matches the mobile node according to the pre-authentication information transmitted by the network side entity of the serving network, and notifies the mobile node of the pre-authentication information selected by it; The mobile node uses the pre-authentication information selected by the target network entity as the pre-authentication information required for pre-authentication. 11. The method according to claim 10, characterized in that the step of notifying the mobile node of the pre-authentication information selected by it is specifically: The network side entity of the serving network forwards the target network entity to notify the mobile node of the selected pre-authentication information. 12. The method according to claim 10, wherein the step of notifying the mobile node of the selected pre-authentication information is specifically: The target network entity directly notifies the mobile node of its selected pre-authentication information. 13. The method according to claim 1, wherein when the mobile node determines the pre-authentication information required for pre-authentication, when the pre-authentication information supported by the mobile node capability and the pre-authentication information supported by the target network capability are incompatible When , the target network entity sends pre-authentication information incompatibility information to the mobile node. 14. The method according to claim 3 or 8, wherein the media-independent message comprises: a media-independent network information acquisition message and/or a media-independent network query message. 15. The method according to claim 1, wherein when the mobile node performs handover between heterogeneous networks, a predictive handover method or a reactive handover method is adopted. 16. A network entity for switching between heterogeneous wireless networks, characterized by comprising: The first obtaining module: used to obtain pre-authentication information supported by the target network capability; The first delivery module: used to deliver the pre-authentication information acquired by the first acquisition module to the mobile node. 17. A network entity for switching between heterogeneous wireless networks, characterized by comprising: Receiving module: used to receive the pre-authentication information reported by the mobile node for its capability support; Selection module: used to select according to the pre-authentication information received by the receiving module, select the pre-authentication information matching the mobile node, and provide the selected pre-authentication information to the second delivery module; The second sending module: used for notifying the mobile node of the pre-authentication information provided by the selecting module. 18. A network entity for switching between heterogeneous wireless networks, characterized by comprising: The second obtaining module: used to obtain the pre-authentication information supported by the mobile node capability; The transfer module: used to transfer the pre-authentication information acquired by the acquisition module to the target network entity through the context transfer mechanism. 19. A mobile node for handover between heterogeneous wireless networks, characterized by comprising: Determination module: used to determine the pre-authentication information required for pre-authentication; A pre-authentication module: used to initiate pre-authentication of the target network according to the pre-authentication information determined by the determination module; Switching module: used to switch between heterogeneous networks according to the pre-authentication passing information provided by the pre-authentication module.

Images