WO2008022597A1

WO2008022597A1 - Method and device for terminal handover, method and device for getting address of origin access entity

Info

Publication number: WO2008022597A1
Application number: PCT/CN2007/070505
Authority: WO
Inventors: Jie Zhao; Xia Yang; Jie Wang
Original assignee: Huawei Technologies Co., Ltd.
Priority date: 2006-08-18
Filing date: 2007-08-17
Publication date: 2008-02-28
Also published as: CN101128022B; CN101128022A

Abstract

A method for terminal handover includes the following steps: after the terminal hands over from the origin access entity to the destination access entity, first information including the terminal IP address before handover is sent from the terminal to the destination access entity. The destination access entity searches the corresponding network mobile agent based on the IP address, and sends mobile IP binding information, which is utilized to bind the terminal IP address and the destination access entity IP address, to the network mobile agent. A device for terminal handover, and a method and a device for getting address of origin access entity are also presented. All the technical solutions can save air interface resource and ensure conversation continuity.

Description

Terminal switching method and device, source access entity address obtaining method and device The present application claims to be submitted to the Chinese Patent Office on August 18, 2006, the application number is 200610109874.6, and the invention name is "terminal switching method and device, source access gateway address The priority of the Chinese Patent Application, which is incorporated herein by reference. Technical field

The present invention relates to the field of mobile communication technologies, and in particular, to a terminal handover method and apparatus, and a source access entity address acquisition method and apparatus. Background technique

Currently, the 3GPP2 (3rd Generation Partnership Project 2) organization is developing standards for interworking between code division multiple access CDMA system networks and networks of other access types such as Wireless Local Access Network (WLAN). The CDMA network is characterized by wide coverage, authentication and billing functions. WLAN networks are characterized by small coverage, low cost, and high bandwidth and high-rate services. The interworking of the two enables the WLAN network to utilize the perfect authentication and charging mechanism provided by the CDMA network to enjoy the services provided by the CDMA network. On the other hand, the CDMA network can utilize the WLAN network as its hotspot coverage and supplementary coverage, and share part of the network load through the WLAN network. . Users can enjoy a wide range of CDMA networks and high-speed, low-cost services for WLAN networks. Therefore, whether from the perspective of operators or users, multi-network convergence will be the trend of future network development.

A key scenario in heterogeneous network interworking is that during the session, when the access system changes, the continuity of the session can be guaranteed. That is, the user can continue the session after the handover without re-establishing. This is more important for real-time services such as VoIP. A model of 3GPP2 and WLAN network interworking has been given in the standard X.S0028 of 3GPP2, and a mobility management implementation based on MIP (Mobile IP) has been developed. The model for implementing network interworking between terminals under MIP is shown in Figure 1.

In Figure 1, the function of each network element is described as follows: H-AAA: AAA of the home location, the authentication of the terminal accessing the WLAN is completed in the H-AAA, and the function of the EAP server is also implemented in the H-AAA; B-AAA : Intermediate AAA; HLR/AC: Provides security for WLAN access to H-AAA Trust parameter; PDIF: Packet data interconnection gateway, which establishes an IKE tunnel with the terminal to ensure data security. At the same time, in the MIP4 foreign agent-care-address (FA-COA) mode, the PDIF also has The function of the foreign agent FA; HA: the home agent in the MIP model, together with PDIF (FA) to achieve terminal mobility.

In addition, each interface is described as follows: Interface 1: Interface between MS and WLAN access network, including physical and link layer protocols; Interface 2: Interface between V-AAA and H-AAA, this interface is used in CDMA The terminal is authenticated in the system and a request/response message is forwarded between V-AAA and H-AAA. This message is based on the IETF RADUIS protocol; interface 3: the interface between the WLAN and the Internet, based on the IETF standard; interface 4: the interface between H-AAA and HLR/AC, existing in the circuit domain, is an optional interface, H - AAA obtains the SMEKEY from the HLR/AC through the interface; Interface 5: Interface between the MS and the PDIF, which is a tunnel interface, supports MS-triggered tunnel establishment, data transmission in the tunnel, and tunnel release; Interface 6: PDIF and Interface between H-AAA/V-AAA, used to obtain IP configuration information of the terminal, perform user authentication, authorization, and support tunnel establishment. Interface 8: Interface between PDIF and HA, forward and backward data Send and receive through this interface; Interface 9: Interface between HA and H-AAA/V-AAA, through which the HA obtains the user's IP configuration information and authentication and authorization parameters; Interface 10: Mobile IP (MIP) , HA and the interface between packet data services, through which the HA accesses packet services such as IMS.

In this interworking scenario, the terminal accesses the WLAN network with its identity in the CDMA network. The process of terminal access is as follows: If the terminal does not have the key WKEY (WLAN Long Term Key) required to access the WLAN, it will first use the extended authentication protocol (EPP) with the WLAN AP and its home AAA in the CDMA network. , Extensible Authentication Protocol ) generates WKEY. Then, the terminal performs the access authentication process by using the WKEY and the AP. After successful, the terminal can access certain services through the WLAN, for example, accessing the Internet. If the terminal also needs to access certain services of the CDMA network, it will establish an IPsec tunnel with the PDIF using IKE. To protect subsequent business data. In addition, in the case of mobile IP, during the process of establishing IKE between the terminal and the PDIF, the PDIF can also transmit the assigned HA, HoA and other information to the terminal.

According to the implementation manner in the protocol, the terminal can dynamically obtain the HoA (home address) or the static HoA. Figure 2 shows the process of dynamically acquiring the HoA by a terminal. As shown in FIG. 2, the foregoing process for dynamically acquiring the HoA by the terminal specifically includes the following operations: First, the mobile station (MS) and the packet data interconnection function (PDIF, ) exchange the IKE_SA_INIT message; then, the terminal is in the IKE-AUTH CP. In the (CFG_REQUEST) message, the 3GPP2-MIP4-MODE attribute is set to indicate that the terminal uses the FA-COA mode, and the terminal indicates that the EAP is used as the authentication mode; after that, the PDIF sends the RADIUS Access Request to the HAAA (attribute AAA); The EAP process is performed between the terminal and the H-AAA.

After the H-AAA successfully authenticates the terminal, it sends a RADIUS ACCESS-ACCEPT to the PDIF and carries the terminal HA (home agent) information. After that, the PDIF allocates a temporary TIA to the MS in the CP (CFG-REPLY) of the IKE-AUTH ( Tunnel Inner Address ), the newly created IPSec SA is associated with this TIA; Next, the PDIF sends a proxy advertisement to the terminal; then, the MS sends the MIP RRQ to the PDIF. To obtain the dynamic HoA, the MS sets the home Address in the RRQ to 0.

Next, the PDIF sends a RADIUS Access-request to the H-AAA and carries the terminal authentication information. Afterwards, the H-AAA successfully authenticates the terminal and sends a RADUIS Access-Accept message to the PDIF. Subsequently, the PDIF forwards the RRQ to the HA, and the HA assigns the terminal to the terminal. A HoA, and returns the HoA to the terminal in the RRP; after obtaining the HoA in the RRP message, the MS sends a CREATE-CHILD-SA message to the PDIF, and sets the TSi to HoA. The PDIF echoes the response. This process generates a new IPsec SA, the corresponding address in the SA is HoA; PDIF deletes the old IPsec SA associated with the temporary TIA generated in the above process.

An IKE tunnel is established between the terminal and the PDIF. The configuration payload (CP) in IKEV2 defines 3GPP2-specific attributes for the 3GPP2 MIP to indicate the MIP4 mode and MIP parameters. The specific definitions are as follows:

The process described above is in a heterogeneous interworking network, and the terminal is obtained in the MIPV4 FA-CoA mode. Ho A, the process of CoA. The PDIF carries the FA CoA to the terminal in the Agent Advertisement message, and the terminal obtains the HoA in the MIPv4 registration response. If it is a MIP4 Co-located Care of Address (CCOA), the PDIF is assigned to the terminal through INTERNAL-IP4-ADDRESS in the IKE-AUTH CP (CFG-REPLY) during the establishment of IKE with the terminal. The CoA, the terminal obtains the HoA in the MIPv4 registration response. If it is ΜΙΡν6, the PDIF carries the CoA assigned to the terminal through the INTERNAL-IP6-ADDRESS in the IKE-AUTH CP (CFG-REPLY) in the process of establishing IKE with the terminal, and passes the extended attribute 3GPP-MIP6-HOA. Assign a HoA to the terminal in CFG-REPLY.

If it is a simple IP (SIP-Simple IP), the PDIF is carried by the INTERNAL-IP4-ADDRESS or INTERNAL-IP6-ADDRESS in the IKE-AUTH CP (CFG-REPLY) during the establishment of the IKE with the terminal. IP address.

At the same time, in order to improve the competitiveness of the 3GPP2 network and meet the needs of IP packet services, the 3GPP2 organization is conducting research on network evolution. The comparatively representative network evolution model proposed at the 3GPP2 conference is shown in Figure 3.

A new physical network mobile agent NMA is set up in the evolved network framework shown in Figure 3.

(Network Mobility Agent) (or Local Mobility Anchor, referred to as NMA for simplicity), the role of this entity is to provide local mobility (such as between CAP or CAP and PDIF) Between the two, as far as possible to ensure that the address of the terminal does not change, for mobile IP, it can also reduce the binding update of the terminal and HA, thus ensuring the continuity of communication. An NMA can be an independent physical entity or coexist with other entities in a physical entity. The access gateway (including CAP, PDIF, PDSN, eNodeB eBS and other packet domain entities) and the IP mesh full-link structure used by the NMA. In theory, any access gateway can be connected to any NMA, that is, multiple For many connections, the purpose is to minimize the re-assignment of NMAs when the session is active. When the terminal moves between different access gateways, if the access gateway before and after the handover is in the same NMA range, the address of the terminal does not need to be updated (there is no need to update the CoA for the mobile IP, and it is not required for the simple IP. Update the IP address), and the access gateway initiates rebinding of the terminal to the NMA, so that when the NMA receives the data packet sent to the terminal, it can forward it to the access gateway to which the current terminal is connected, and then The access gateway forwards to the terminal. The above process is transparent to the terminal. The flowchart of FIG. 4 shows the flow of the terminal performing MIP registration in the MIP4 FA-COA mode in the evolved CDMA network architecture.

As shown in FIG. 4, the process of performing MIP registration by the terminal includes the following operations: (1) establishing an air interface connection and a session connection between the terminal and the access gateway (AGW, Access Gate Way); (2) completing the access authentication by the terminal; (3) The AGW obtains an FA CoA in the NMA subnet from the DHCPv4 Serer for all the terminals managed by the AGW; (4) The AGW sends a proxy advertisement message to the terminal as a MIP FA proxy, and the message includes the FA CoA obtained in the previous; (5) The terminal sends a MIP v4 registration request, and can request the indication of the dynamic HoA and HA; (6) The AGW sends the RRQ to the NMA, binds the address of the AGW (as the CoA in MIP4), and the local link address of the terminal (as (7) NMA, at this time as the FA of MIP4, initiates a RADIUS/DIAMETER request for a school insurance registration request and assigns HA to HAAA; (8) HAAA sends a RADIUS/DIAMETER response to the NMA, and if the registration request is successful, the response Include an HA address; (9) Establish an IPSec SA between the NMA (FA) and the HA; (10) The NMA (FA) sends a registration request to the HA; (11) After receiving the registration request, the HA may request it from HAAA.To verify the key required for the registration request, after the verification is passed, the HA sends a registration success response to the NMA, and assigns a HoA to the terminal in the response; (12) the NMA forwards the RRP to the AGW; (13) the AGW from the RRP The message obtains the HoA of the terminal; (14) the AGW sends the RRP to the terminal; (15) the MIP4 registration is completed between the AGW and the NMA, and the AGW binds the IP address of the HoA and the access gateway of the terminal to the NMA.

In this way, a MIP4 tunnel is established between the access gateway and the NMA and between the NMA and the HA.

When the terminal moves between different access gateways (including CAP, PDIF), if the mobile access gateway can connect to the pre-mobile NMA, the terminal's CoA, or the IP address of the terminal, the IP address of the terminal can remain unchanged. In this case, the terminal does not need to re-initiate the binding to the HA. Only the access gateway needs to bind the address of the NMA originating terminal to the IP address of the access gateway.

In the prior art, after the handover occurs, how to obtain the address of the terminal by the destination access network and select the previously connected NMA, there is no certain solution. Especially for the handover between heterogeneous networks, if such a function can be realized, it is advantageous to reduce the handover delay. In addition, When switching between heterogeneous networks, a signaling connection needs to be established between the access gateways, so that the destination access gateway can obtain the relevant data of the terminal from the source access gateway, but how to obtain the address of the source access gateway, in the prior art No viable implementation is provided. Summary of the invention

The present invention provides a mobile terminal handover method and apparatus, and a source access entity address acquisition method and apparatus, which can maintain continuity of a session.

A mobile terminal switching method provided by the present invention includes:

After the terminal is switched from the source access entity to the destination access entity, the terminal sends a first message to the destination access entity, where the first message carries the IP address of the terminal before the handover; The inbound entity responds to the first message, and searches for a corresponding network mobile agent according to the terminal IP address;

The destination access entity sends a mobile IP binding message to the network mobility agent, binding the IP address of the terminal and the IP address of the destination access entity.

The method for obtaining a source access entity address provided by the present invention includes:

The destination access entity sends a query request message to the network mobile agent to query the source access entity address of the terminal, where the query request message carries the IP address of the terminal;

The network mobility agent queries the address of the source access entity in response to the query request message, and returns the address to the destination access entity.

Another source access entity address obtaining method provided by the present invention includes:

After the terminal switches from the source access entity to the destination access entity, the terminal sends a network key exchange protocol message to the destination access entity, where the active access entity address is carried;

After receiving the network key exchange protocol message, the destination access entity obtains an address of the source access entity from the network key exchange protocol message.

The mobile terminal switching device provided by the present invention includes:

a first message sending module, configured to send a message to the destination access entity, and after the terminal switches from the source access entity to the destination access entity, send a first message to the destination access entity, where the terminal carries Switch the previous IP address;

The finding module, in response to the first message, searching for a corresponding network mobile agent according to the terminal IP address; And a second message sending module, configured to send a mobile IP binding message to the network mobile agent, to bind the IP address of the terminal and an IP address of the destination access entity.

The source access entity address obtaining apparatus provided by the present invention includes:

a message sending module, configured to send a query request message to the network mobile agent, to query a source access entity address of the terminal, where the query request message carries an IP address of the terminal;

An address query module, responsive to the query request message, the address query module queries an address of the source access entity, and returns the query request message sending module.

Another source access entity address obtaining apparatus provided by the present invention includes:

a message sending module, configured to send a network key exchange protocol message to the destination access entity after the terminal switches from the source access entity to the destination access entity, where the active access entity address is carried;

And an address obtaining module, configured to obtain, according to the network key exchange protocol message, an address of the source access entity from the network key exchange protocol message.

In the technical solution provided by the present invention, after the handover of the terminal supporting the mobile IP, if the switched access gateway still selects the local mobile agent before handover to perform mobile IP rebinding, the handover address of the terminal may remain unchanged. There is no need to initiate re-registration to the home agent HA, thus reducing signaling interaction, avoiding packet loss, saving air interface resources, and better ensuring session continuity. DRAWINGS

The drawings are intended to provide a further understanding of the present invention, and are intended to be a part of the present invention. In the drawing:

1 is a schematic diagram showing a model for implementing network interworking by a terminal under MIP;

2 is a signaling flowchart showing dynamic acquisition of a HoA by a terminal;

3 is a schematic diagram showing an exemplary network evolution model;

4 is a signaling flow chart showing a MIP registration process performed by a terminal according to the related art; FIG. 5 is a flowchart showing a mobile terminal switching method according to the first embodiment of the present invention; The terminal of an embodiment switches from a CDMA network to a WLAN network and uses a signaling flow chart of MIP4; 7 is a signaling flow chart showing handover of a terminal from a CDMA network to a WLAN network and using MIP 6 according to the first embodiment of the present invention;

8 is a flow chart showing the signaling of a terminal switching from a CDMA network to a WLAN network and using SIP 4 according to the first embodiment of the present invention;

9 is a flow chart showing a method of acquiring a source access gateway address according to a second embodiment of the present invention;

FIG. 10 is a flowchart showing a method of acquiring a source access gateway address according to a third embodiment of the present invention; FIG.

11 is a signaling flow chart showing a source access gateway address acquisition method according to a third embodiment of the present invention;

Figure 12 is a block diagram showing a mobile terminal switching apparatus according to a fourth embodiment of the present invention; Figure 13 is a block diagram showing a source access gateway address obtaining apparatus according to a fifth embodiment of the present invention;

Figure 14 is a block diagram showing a source access gateway address obtaining apparatus according to a sixth embodiment of the present invention;

FIG. 15 is a signaling flowchart of a mobile terminal handover method according to an embodiment of the present invention. detailed description

The preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, in which FIG.

First embodiment

In this embodiment, a mobile terminal switching method is provided. Fig. 5 is a flowchart showing a terminal switching method according to the first embodiment of the present invention.

As shown in FIG. 5, the mobile terminal handover method according to the first embodiment of the present invention includes the following steps:

Step S502: After the terminal switches from the source access gateway to the destination access gateway, the terminal sends a first message to the destination access gateway, where the IP address of the terminal before the handover is carried.

Step S504, responding to the first message, the destination access gateway searches for a corresponding network mobile agent according to the terminal IP address;

Step S506, the destination access gateway sends a mobile IP binding message to the network mobile agent, where Bind the IP address of the terminal to the IP address of the destination access gateway.

For the mobile IP, the above IP address is the care-of address or home address of the terminal. For a simple IP, the above IP address is the IP address of the terminal.

In the case that the terminal is switched from the CDMA network to the WLAN network, in step S502, the first message is an IKE-AUTH message of the network key exchange protocol, used to establish a network key exchange protocol connection, and the terminal passes the network key exchange protocol. IKE—AUTH transmits the care-of address and home address to the destination access gateway. In addition, in step S504, the destination access gateway searches for the corresponding network mobility agent according to the terminal IP address, and in step S506, binds the terminal IP address and the IP address of the destination access gateway.

Specifically, in a case where the terminal uses the MIP4 FA-COA mode, in step S502, in the IKE_AUTH message of the network key exchange protocol, the terminal sends the care-of address and the home address to the destination access gateway, and CFG—The attribute INTERNAL in the REQUEST—IP4—ADDRESS is set to the home address before the switch, and the new attribute is extended to pass the care-of address before the switch:

NO! 0 or 4 octets In the case where the terminal uses the CC4 CCOA mode, in step S502, in the IKE_AUTH message of the network key exchange protocol, the terminal sets the attribute INTERNAL_IP4_ADDRESS in the CFG_REQUEST to be before switching. The care-of address. In the case where the terminal uses the MIP6 mode, in step S502, in the IKE_AUTH message of the network key exchange protocol, the terminal sets the attribute INTERNAL_IP6_ADDRESS in the CFG_REQUEST to the care-of address before the handover. Among them, FIG. 6 to FIG. 8 respectively show signaling flowcharts for the terminal to switch from the CDMA network to the WLAN network by using MIP4, MIP6, and SIP4, respectively.

In the case where the terminal uses the simple IPv4 or simple IPv6 mode, in step S502, in the IKE_AUTH message of the network key exchange protocol, the terminal sets the attribute INTERNAL_IP4_ADDRESS or INTERNAL_IP6 in the CFG_REQUEST- The ADDRESS is set to the IP address before the handover. In step S504, the destination access gateway searches for the corresponding network mobility agent according to the IP address, and in step S506, binds the IP address of the terminal and the IP address of the destination access gateway.

In addition, in a case where the terminal is switched from the WLAN network to the CDMA network, in step S502 The first message is an execution authentication message or a session establishment connection message, where the terminal IP address or the source access gateway address before the handover is carried, where the authentication message is used to perform authentication, and the session establishment connection message is used for purpose. The access gateway establishes a connection.

Specifically, in step S504, the destination access gateway searches for a corresponding network mobile agent by configuring a range of terminal addresses or terminal address prefixes managed by each network mobile agent, or searches for a corresponding network mobile agent by querying a related database. The relevant database stores the range of addresses or address prefixes managed by each network mobile agent. Further, in step S506, the IP address of the terminal is used as the home address, and the IP address of the destination access gateway is used as the care-of address.

Second embodiment

In this embodiment, a source access gateway address obtaining method is provided. 9 is a flow chart showing a source access gateway address acquisition method according to a second embodiment of the present invention.

As shown in FIG. 9, the source access gateway address obtaining method according to the second embodiment of the present invention includes the following steps:

Step S902: The destination access gateway sends a query request message to the network mobile agent to query the source access gateway address of the terminal, where the query request message carries the IP address of the terminal. Step S904, responding to the query request message, the network moves The proxy queries the address of the source access gateway and returns it to the destination access gateway.

The source access gateway refers to the gateway corresponding to the terminal before the handover, and the destination access gateway refers to the gateway corresponding to the terminal after the handover. The address of the terminal is the home address when the access gateway performs mobile IP binding to the network mobile agent, and the address of the source access gateway is the care-of address corresponding to the home address.

In order to achieve the above functions, some extensions can be made to the mobile IP, including:

(1) In the mobile IP, the function of querying the current CoA through the HoA is added, that is, an entity sends a request to the HA, and the request includes the HoA, and the HA returns the current CoA to the request after receiving the request. In this way, the destination access gateway sends the IP address of the terminal, that is, the HoA, to the NMA (that is, the HA), and the NMA returns the CoA, that is, the IP address of the source access gateway, to the destination access gateway.

(2) When an entity does the rebinding of the address, the original CoA is requested, and the HA will be the new CoA. After the binding with the HoA is successful, the original CoA is returned to the entity; when the destination access gateway sends a binding update or registration request to the NMA to bind its own address and the IP address of the terminal, the request is also requested. The address of the original CoA, so that the NMA sends the original CoA, that is, the address of the source access gateway, to the destination access gateway in the binding confirmation or registration response message.

Third embodiment

In this embodiment, another source access gateway address obtaining method is provided. FIG. 10 is a flowchart of a source access gateway address obtaining method according to a third embodiment of the present invention, and FIG. 11 is a signaling flowchart of a method for acquiring a source access gateway address according to a third embodiment of the present invention. Description will be made with reference to FIGS. 10 and 11.

As shown in FIG. 10 and FIG. 11, the source access gateway address obtaining method according to the third embodiment of the present invention includes the following steps:

Step S1002: After the terminal switches from the source access gateway to the destination access gateway, the terminal MT sends an IKE-AUTH message of the network key exchange protocol IKE Exchange to the destination access gateway, where the active access gateway address is carried;

Step S1004: In response to the IKE-AUTH message of the network key exchange protocol, the destination access gateway obtains the address of the source access gateway from the IKE-AUTH message of the network key exchange protocol.

The terminal sets the new attribute 3GPP2_SRC_AGW extended in the IKE_AUTH message of the network key exchange protocol to the address of the source access gateway after the handover. Extend the 3GPP2 specific related attributes in the IKEv2 Configuration Payload message as follows:

Attribot Type ! Multi-Wio^d ! Length Descriptioo

1 3GIH CLAGW ! ()390 1 NO I 0 or 4

1 oct ts or address of the access gateway

! 6 octets The source access gateway address obtaining method according to the third embodiment of the present invention further includes the following steps:

Step S1006: The destination access gateway establishes a connection with the source access gateway to obtain the IP address or other information of the terminal from the source access gateway (including the network mobile agent address, security key, OoS related parameters, etc. ). After that, the destination access gateway initiates the terminal IP address to the NMA (for the simple IP, the terminal's IP address, for mobile IPv4, the terminal's home address HoA, for mobile IPv6, the terminal's care-of address CoA) and the destination access gateway address. Binding. Fourth embodiment

In this embodiment, a mobile terminal switching apparatus is provided. Figure 12 is a block diagram showing a mobile terminal switching device according to a fourth embodiment of the present invention.

As shown in FIG. 12, the mobile terminal switching apparatus 1200 according to the fourth embodiment of the present invention includes: a first message sending module 1202, configured to: after the terminal switches from the source access gateway to the destination access gateway, to the destination access gateway Sending a first message, where the IP address of the terminal before the handover is carried;

The network mobile agent lookup module 1204, in response to the first message, finds the corresponding network mobile agent according to the terminal IP address;

The second message sending module 1206 is configured to send a mobile IP binding message to the network mobile agent to bind the IP address of the terminal and the IP address of the destination access gateway.

For mobile IP, the IP address is the care-of address or home address of the terminal. For simple IP, the IP address is the IP address of the terminal.

In the case that the terminal is switched from the CDMA network to the WLAN network, the first message is an IKE-AUTH message of the network key exchange protocol, used to establish a network key exchange protocol connection, and the terminal tunnels the care-of address and the network through the network key exchange protocol. The home address is transmitted to the destination access gateway.

The network mobile agent lookup module 1204 searches for the corresponding network mobile agent according to the terminal IP address, and the mobile IP binding message is used to bind the IP address of the terminal and the IP address of the destination access gateway.

In the case that the terminal uses the MIP4 FA-COA mode, in the IKE_AUTH message of the network key exchange protocol, the first message sending module 1202 sends the care-of address and the home address to the destination access gateway, and CFG_REQUEST The attribute INTERNAL_IP4_ADDRESS is set to the home address before the terminal is switched, and the new attribute is extended to pass the care-of address before the handover. In the case where the terminal uses the MIP4 CCOA mode, in the IKE_AUTH message of the network key exchange protocol, the first message sending module 1202 sets the attribute INTERNAL_IP4_ADDRESS in the CFG_REQUEST to the care-of address before the terminal handover. . In the case where the terminal uses the MIP6 mode, in the IKE_AUTH message of the network key exchange protocol, the first message sending module 1202 sets the attribute INTERNAL_IP6_ADDRESS in the CFG_REQUEST to the end. The care-of address before the end switch.

In the case that the terminal uses the simple IPv4 or simple IPv6 mode, in the IKE_AUTH message of the network key exchange protocol, the first message sending module 1202 sets the attribute INTERNAL_IP4_ADDRESS or INTERNAL_IP6 in the CFG_REQUEST- The ADDRESS is set to the IP address before the terminal handover, and the network mobile agent lookup module 1204 searches for the corresponding network mobility agent according to the IP address, and the mobile IP binding message is used to bind the IP address of the terminal and the IP address of the destination access gateway. .

In the case that the terminal is switched from the WLAN network to the CDMA network, the first message is an execution authentication message or a session establishment connection message, where the terminal IP address before the handover or the address of the source access gateway is carried. The execution of the authentication message is used to perform authentication, and the session establishment connection message is used to establish a connection with the destination access gateway.

The network mobile agent lookup module 1204 searches for a corresponding network mobile agent by configuring a range of terminal addresses or terminal address prefixes managed by each network mobile agent, or searches for a corresponding network mobile agent by querying a related database, where the related database is saved. The range of addresses or address prefixes managed by each network mobility agent.

Specifically, the IP address of the bound terminal is used as the home address, and the IP address of the destination access gateway is used as the care-of address.

Fifth embodiment

In this embodiment, a source access gateway address obtaining apparatus is provided. Figure 13 is a block diagram showing a source access gateway address obtaining apparatus according to a fifth embodiment of the present invention.

As shown in FIG. 13, the source access gateway address obtaining apparatus 1300 in this embodiment includes: a query request message sending module 1302, configured to send a query request message to the network mobile agent to query the source access gateway address of the terminal, where The query request message carries the IP address of the terminal;

The address query module 1304, in response to the query request message, the address query module 1304 queries the address of the source access gateway and returns it to the query request message sending module.

The source access gateway refers to the gateway corresponding to the terminal before the handover, and the destination access gateway refers to the gateway corresponding to the terminal after the handover. The address of the terminal is the home address when the access gateway performs mobile IP binding to the network mobile agent, and the address of the source access gateway corresponds to the home address. The care-of address.

Sixth embodiment

In this embodiment, another source access gateway address obtaining apparatus is provided. Figure 14 is a block diagram showing a source access gateway address obtaining apparatus according to a sixth embodiment of the present invention.

As shown in FIG. 14, the source access gateway address obtaining apparatus 1400 according to the sixth embodiment of the present invention includes:

The IKE-AUTH message sending module 1402 of the network key exchange protocol is configured to send an IKE-AUTH message of the network key exchange protocol to the destination access gateway after the terminal switches from the source access gateway to the destination access gateway, where Active access gateway address;

a source access gateway address obtaining module 1404, configured to respond to a network key exchange protocol

IKE—AUTH message, the address of the source access gateway is obtained from the IKE-AUTH message of the network key exchange protocol.

Wherein, after the terminal handover, the IKE-AUTH message sending module 1402 of the network key exchange protocol sets the new attribute 3GPP2_SRC_AGW extended in the IKE_AUTH message of the network key exchange protocol to the address of the source access gateway.

The source access gateway address obtaining apparatus 1400 according to the present invention further includes:

The information obtaining module 1406 is configured to establish a connection with the source access gateway to obtain an IP address of the terminal or other information such as a network mobile agent address before the terminal handover from the source access gateway.

Referring to FIG. 15, in a specific implementation, the original access point and the destination access point may belong to different access systems, for example, the original access point is a base station in a cellular network, and the destination access point is used to implement WLAN interworking. PDIF. But they can connect to the same unified access point, and the access point contains the mobility anchor, which is the function of LMA or NMA.

Step 1500: The access terminal AT establishes a connection with the original access point, and implements normal communication. Step 1501: After the AT switches from the original access point to the destination access point, the terminal sends a first message to the destination access point. The IP address of the terminal before the handover is carried;

Step 1502: The destination access point responds to the first message, and the destination access point searches for a corresponding access concentration point according to the terminal IP address;

Step 1503: The destination access point sends a mobile IP binding message to the access point to bind the IP address of the terminal and the IP address of the destination access point. Wherein, for the mobile IP, the IP address is a care-of address or a home address of the terminal, and for a simple IP, the ip address is an IP address of the terminal.

In the case that the terminal is switched from the CDMA network to the WLAN network, in step 1501, the first message is an IKE-AUTH message of the network key exchange protocol, used to establish a network key exchange protocol connection, and the terminal uses a network key exchange protocol. IKE—AUTH transmits the care-of address and home address to the destination access point. In addition, in step 1502, the destination access point searches for a corresponding access point according to the terminal IP address, and in step 1503, binds the terminal IP address and the IP address of the destination access point.

Specifically, in the case where the terminal uses the MIP4 FA-COA mode, in step 1501, in the IKE_AUTH message of the network key exchange protocol, the terminal sends the care-of address and the home address to the destination access point, and CFG—The attribute INTERNAL in the REQUEST—IP4—ADDRESS is set to the home address before the switch, and the new attribute is extended to pass the care-of address before the switch:

In the case where the terminal uses the MIP4 CCOA mode, in step 1501, in the IKE_AUTH message of the network key exchange protocol, the terminal sets the attribute INTERNAL_IP4_ADDRESS in the CFG_REQUEST to the care-of address before the handover. In the case where the terminal uses the MIP6 mode, in step 1501, in the IKE_AUTH message of the network key exchange protocol, the terminal sets the attribute INTERNAL_IP6_ADDRESS in the CFG_REQUEST to the care-of address before the handover.

In the case where the terminal uses the simple IPv4 or simple IPv6 mode, in step 1501, in the IKE_AUTH message of the network key exchange protocol, the terminal sets the attribute INTERNAL_IP4_ADDRESS or INTERNAL_IP6 in the CFG_REQUEST- The ADDRESS is set to the IP address before the handover. In step 1502, the destination access gateway searches for the corresponding network mobility agent according to the IP address, and in step 1503, binds the IP address of the terminal and the IP address of the destination access gateway.

A person skilled in the art may understand that all or part of the modules or steps in the foregoing embodiments may be implemented by a program to instruct related hardware, and the program may be stored in a computer readable storage medium, such as a storage medium, such as ROM/RAM, disk, CD, etc. Or put them Each of the integrated circuit modules is fabricated separately, or a plurality of modules or steps thereof are fabricated into a single integrated circuit module. Thus, the invention is not limited to any specific combination of hardware and software.

The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims

Rights request

A mobile terminal switching method, comprising:

The mobile terminal switching method according to claim 1, wherein when the mobile IP is used, the terminal IP address is a care-of address or a home address of the terminal.

The mobile terminal handover method according to claim 2, wherein, in a case that the terminal is switched from a CDMA network to a WLAN network, the first message is a network key exchange protocol message, and is used to establish a network. The key exchange protocol is connected, and the terminal transmits the care-of address and the home address to the destination access entity by using the network key exchange protocol message.

The mobile terminal handover method according to claim 2, wherein the network key exchange protocol message sent by the terminal when the terminal uses the MIP4 foreign agent-care-of address FA-COA mode Sending the care-of address and the home address to the destination access entity, setting an address attribute in the configuration request message to the home address before switching, and extending a new attribute to deliver the pre-switching The care-of address.

The mobile terminal switching method according to claim 1 or 2, wherein, in the network key exchange protocol message sent by the terminal, when the terminal uses the MIP4 to configure the care-of address CCOA mode, The address attribute in the configuration request message is set as the care-of address before switching.

The mobile terminal switching method according to claim 2, wherein, in the MIP6 mode of the terminal, in the network key exchange protocol message sent by the terminal, in a configuration request message The address attribute is set to the care-of address before its switch.

The mobile terminal handover method according to claim 1 or 2, wherein the network key exchange protocol sent by the terminal when the terminal uses an IPv4 or IPv6 mode In the message, the address attribute in the configuration request message is set to the IP address before the switch.

The mobile terminal handover method according to claim 1 or 2, wherein, in a case where the terminal is switched from a WLAN network to a CDMA network, the first message is an execution authentication message or a session establishment connection message, The message carries the terminal IP address or the address of the source access entity before the handover.

The mobile terminal handover method according to claim 8, wherein the performing an authentication message is used to perform authentication, and the session establishment connection message is used to establish a connection with the destination access entity.

The mobile terminal handover method according to claim 1, wherein the destination access entity searches for the corresponding network mobile agent by configuring a range of a terminal address or a terminal address prefix managed by each network mobility agent. .

The mobile terminal switching method according to claim 1, wherein the IP address of the binding terminal and the IP address of the destination access entity include:

The destination access entity queries the relevant database to obtain the corresponding network mobility agent related information, and the related database stores the address or address prefix range managed by each network mobile agent.

The IP address of the terminal is used as the home address, and the IP address of the destination access entity is used as the care-of address.

A method for obtaining a source access entity address, comprising:

The source access entity address obtaining method according to claim 13, wherein the source access entity is an entity corresponding to the terminal before the handover, and the destination access entity is the terminal The entity corresponding to the switch.

15. The source access entity address obtaining method according to claim 13, wherein: The address of the terminal is a home address when the access entity performs mobile IP binding to the network mobile agent, and the address of the source access entity is a care-of address corresponding to the home address.

A method for obtaining a source access entity address, comprising:

The source access entity address obtaining method according to claim 16, wherein the terminal sets, after the handover, a new attribute extended in the network key exchange protocol message as the source access entity. the address of.

The source access entity address obtaining method according to claim 17, further comprising:

The destination access entity establishes a connection with the source access entity to obtain an IP address of the terminal or a network mobility proxy address before the terminal handover from the source access entity.

A mobile terminal switching device, comprising:

And searching, in response to the first message, searching for a corresponding network mobility agent according to the terminal IP address;

And a second message sending module, configured to send a mobile IP binding message to the network mobile agent, to bind the IP address of the terminal and an IP address of the destination access entity.

20. The mobile terminal switching device according to claim 19, wherein the IP address is a care-of address or a home address of the terminal.

The mobile terminal switching device according to claim 20, wherein, in a case that the terminal is switched by a CDMA network to a WLAN network, the first message is a network key exchange protocol message, and is used to establish a network. The key exchange protocol is connected, and the terminal transmits the care-of address and the home address to the destination access entity by using the network key exchange protocol message.

The mobile terminal switching apparatus according to claim 21, wherein the searching module searches for the corresponding network mobile agent according to the terminal IP address, and the mobile IP binding message is used for binding a location The terminal IP address and the IP address of the destination access entity.

23. The mobile terminal switching apparatus according to claim 22, wherein, in the case where the terminal uses the MIP4 foreign agent-care-of address FA-COA mode, in the network key exchange protocol message, The first message sending module sends the care-of address and the home address to the destination access entity, and sets an address attribute in the configuration request message to the home address before the terminal is switched, and expands the new address. The attribute to pass the care-of address before the switch.

The mobile terminal switching device according to claim 22, wherein, in the case that the terminal uses the MIP4 to configure a care-of address CCOA mode, in the network key exchange protocol message, the first message The sending module sets the address attribute in the configuration request message to the care-of address before the terminal handover.

The mobile terminal switching device according to claim 22, wherein, in a case where the terminal uses the MIP6 mode, in the network key exchange protocol message, the first message sending module is configured The address attribute in the request message is set to the care-of address before the terminal handover.

The mobile terminal switching device according to claim 22, wherein, in the case that the terminal uses an IPv4 or IPv6 mode, in the network key exchange protocol message, the first message sending module Setting an address attribute in the configuration request message to the IP address before the terminal handover, the searching module searches the corresponding network mobile agent according to the IP address, and the mobile IP binding message is used by Binding the IP address of the terminal and the IP address of the destination access entity.

The mobile terminal switching apparatus according to claim 20, wherein, in a case where the terminal is switched by a WLAN network to a CDMA network, the first message is an execution authentication message or a session establishment connection message, and the message is Carrying the terminal IP address or the address of the source access entity before the handover.

The mobile terminal switching device according to claim 27, wherein the execution of the authentication message is used to perform authentication, and the session establishment connection message is used for the destination access The body establishes a connection.

The mobile terminal switching device according to claim 19, wherein the network mobile agent searching module searches for the corresponding network mobile by configuring a range of a terminal address or a terminal address prefix managed by each network mobile agent. proxy.

The mobile terminal switching apparatus according to claim 19, wherein the searching module searches for the corresponding network mobile agent by querying a related database, and the related database stores an address managed by each network mobile agent. Or the range of address prefixes.

The mobile terminal switching device according to claim 19, wherein the IP address of the bound terminal is used as a home address, and the IP address of the destination access entity is used as a care-of address.

32. A source access entity address obtaining apparatus, comprising:

The source access entity address obtaining apparatus according to claim 32, wherein the source access entity refers to an entity corresponding to the terminal before the handover, and the destination access entity refers to the The entity corresponding to the terminal after the switch.

The source access entity address obtaining apparatus according to claim 32, wherein the address of the terminal is a home address when the access entity performs mobile IP binding to the network mobile agent, and the source access entity The address is the care-of address corresponding to the home address.

35. A source access entity address obtaining apparatus, comprising:

The source access entity address obtaining apparatus according to claim 35, wherein, after the terminal is switched, the message sending module sends the network key exchange protocol message The extended new attribute 3GPP2 - SRC - AGW is set to the address of the source access entity.

The source access entity address obtaining apparatus according to claim 35, further comprising:

And an information obtaining module, configured to establish a connection with the source access entity, to obtain an IP address of the terminal or other information including a network mobile agent address before the terminal handover from the source access entity.