CN101128022B

CN101128022B - Terminal switching method and device and acquisition method and device for source access gateway address

Info

Publication number: CN101128022B
Application number: CN2006101098746A
Authority: CN
Inventors: 赵洁; 杨霞; 王洁
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2006-08-18
Filing date: 2006-08-18
Publication date: 2011-02-02
Anticipated expiration: 2026-08-18
Also published as: CN101128022A; WO2008022597A1

Abstract

The utility model provides a switching method of mobile terminal, comprising the following steps: step one, after the terminal is switched from a source access gateway to a target access gateway, the terminal sends a first message carrying the IP address before the switch of the terminal to the target access gateway; step two, to respond the first message, the target access gateway searches the corresponding network mobile agency according to the IP address; step three, the target access gateway sends to the network mobile agency the mobile IP binding message to bind the IP address of the terminal and the IP address of the target access gateway. The utility model also provides a device for mobile terminal switching, and a method and a device for acquiring the address of the source access gateway. With the technical proposal, the utility model has the advantages of saving air interface resource and ensuring the continuity of conversation.

Description

Terminal switching method and device, source access gateway address acquisition methods and device

Technical field

The present invention relates to the communications field, and more particularly, relate to a kind of terminal switching method and device, a kind of source access gateway address acquisition methods and device, it is particularly useful for evolvement network.

Background technology

At present, 3GPP2 (third generation partnership projects 2) the tissue standard of working out CDMA (code division multiple access system) network and carrying out intercommunication such as the network of other access styles of WLAN (wireless local access network) etc.The characteristics of cdma network are that functions such as scope covers extensively, authentication and accounting are very ripe.Wlan network has the advantages that area coverage is little, cost is low, high bandwidth and high rate services can be provided.The perfect authentication note expense that both intercommunications make wlan network can utilize cdma network to provide is machine-processed, enjoy the business that cdma network provides, cdma network can utilize wlan network to cover and replenish covering as its focus on the other hand, shares the subnetwork load by wlan network.The user then can enjoy the wide and wlan network two-forty of cdma network scope, service cheaply simultaneously.Therefore, no matter be to consider from operator or from user's angle, it all will be the trend of future network development that many nets merge.

It is exactly in conversation procedure that a crucial scene is arranged in the heterogeneous network intercommunication, can guarantee the continuity of session during the conversion of terminal generation connecting system, and promptly the user can proceed session after switching, and does not need to rebulid.This point is even more important for real time business such as VoIP.In the standard x .S0028 of 3GPP2, provided the model of 3GPP2 and wlan network intercommunication, formulated mobile management implementation based on MIP (mobile IP).The model of terminal realization network interworking as shown in Figure 1 under MIP.

In Fig. 1, each Network Element Function is described below: H-AAA: the AAA of ownership place, and terminal inserts the authentication of WLAN and finishes in H-AAA, has also realized the function of EAP server simultaneously among the H-AAA; B-AAA: middle AAA; HLR/AC: the safe trust parameter when providing WLAN to insert to H-AAA; PDIF: set up the IKE tunnel between the grouped data interconnecting gateway, it and terminal and guarantee safety of data, under the MIP4FA-COA pattern, PDIF also possesses the function of FA simultaneously; Home agent in the HA:MIP model, and PDIF (FA) realizes the mobility of terminal together.

In addition, each interface is described below: the interface between interface 1:MS and the WLAN Access Network comprises physics and link layer protocol; Interface between interface 2:V-AAA and the H-AAA, this interface are used for authenticating terminal in cdma system, and between V-AAA and H-AAA the forward pass requests/response messages.This message is based on IETF RADUIS agreement; Interface between interface 3:WLAN and the Internet is based on ietf standard; Interface between interface 4:H-AAA and the HLR/AC exists in circuit domain, is an optional interface, and H-AAA obtains SMEKEY by this interface to HLR/AC; Interface between interface 5:MS and the PDIF, this is a tunnel interface, and the tunnel of supporting MS to trigger is set up, and data are transmitted in the tunnel and the tunnel discharges; Interface between interface 6:PDIF and the H-AAA/V-AAA is used for obtaining the IP configuration information of terminal, carries out authentification of user, mandate and supports process such as tunnel foundation; Interface between interface 8:PDIF and the HA, forward direction and back send and receive by this interface to data; Interface between interface 9:HA and the H-AAA/V-AAA, HA obtains user's IP configuration information and authentication, authorization parameter etc. by this interface; Interface 10: under the mobile IP (MIP), the interface between HA and the Packet data service, HA by this interface accessing Packet Service such as IMS etc.

The scene of this intercommunication, terminal are to insert wlan network with its identity in cdma network.The process that terminal inserts is roughly as follows: if terminal does not insert the needed key WKEY of WLAN (WLAN Long Term Key), at first it can utilize EAP (Extensible Authentication Protocol) agreement to generate WKEY with AP and its ownership AAA in cdma network of WLAN.Then terminal can use WKEY and AP to carry out access authentication procedure, and success back terminal just can be visited some business by WLAN, for example inserts Internet.If terminal also needs to visit some business of cdma network, its meeting and PDIF utilize IKE to set up the IPsec tunnel, protect follow-up business datum.In addition, under mobile IP situation, set up between terminal and PDIF in the process of IKE, PDIF can also be the information such as HA, HoA that the terminal transmission distributed.

According to the implementation in the agreement, terminal can dynamically be obtained HoA (home address), also can static state provide HoA, and Fig. 2 shows the flow process that a terminal is dynamically obtained HoA.

As shown in Figure 2, the flow process that above-mentioned terminal is dynamically obtained HoA specifically comprises following operation: at first, MS (mobile radio station) and PDIF (grouped data interconnect function) have exchanged IKE_SA_INIT message; Then, terminal is provided with 3GPP2_MIP4_MODE attribute indicating terminal and uses the FA-COA pattern in the CP of IKE_AUTH (CFG_REQUEST) message, and simultaneously, terminal represents to use EAP as authentication mode; Afterwards, PDIF sends RADIUSAccess Request to HAAA (ownership place AAA); Next, carry out the EAP process between terminal and the H-AAA.

After H-AAA success identity terminal, send RADIUSACCESS-ACCEPT to PDIF, simultaneously carried terminal HA (home agent) information; Afterwards, PDIF distributes an interim TIA (Tunnel Inner Address) to MS in the CP of IKE-AUTH (CFG-REPLY), and newly-built IPSec SA is related with this TIA; Next, PDIF sends agent advertisement to terminal; Subsequently, MS sends MIP RRQ to PDIF, and in order to obtain dynamic HoA, MS is made as 0 with the home Address among the RRQ.

Next, PDIF sends agent advertisement to terminal; Subsequently, MS sends MIP RRQ to PDIF, and in order to obtain dynamic HoA, MS is made as 0 with the home Address among the RRQ.Next, PDIF sends RADIUS Access-request to H-AAA, and the carried terminal authentication information; H-AAA success identity terminal concurrence send RADUISAccess-Accept message to give PDIF afterwards; Subsequently, PDIF forward pass RRQ gives HA, and HA gives HoA of terminal distribution, and returns HoA and give terminal in RRP; MS obtains HoA in RRP message after, send CREATE-CHILD-SA message, and TSi is made as HoA to PDIF.The PDIF back response.This process can generate a new IPsecSA, and corresponding address is HoA among the SA; That PDIF deletion produces in said process and the related old IPsec SA of TIA temporarily.

Set up the IKE tunnel between terminal and the PDIF, the configurationpayload among the IKEV2 (CP) is used to refer to MIP4 pattern and MIP parameter for 3GPP2MIP has defined 3GPP2-specific attributes, is defined as follows shown in the table:

Attribute?Type	Value	Multi-Valued	Length	Description
					3GPP2_MIP4_MODE	16384	NO	0	It is the FA-COA pattern that terminal is used to refer to MIPv4
3GPP2_MIP4_HA	16385	YES	0?or?4?octets	Terminal is used for asking MIPv4 HA address
					3GPP2_MIP6_HA	16387	YES	0?or?16?octets	Terminal is used for asking MIPv6 HA address
3GPP2_MIP6_HOA	16388	NO	0?or?16?octets	Terminal is used for asking MIPv6 HoA address

Flow process described above is in the isomery intercommunication network, and terminal obtains the process of HoA, CoA under the MIPV4 FA-CoA pattern.PDIF carries FA CoA to terminal in Agent Advertisement message, and terminal obtains HoA in MIPv4 registration response.If MIP4 is CCOA, then PDIF is setting up in the process of IKE with terminal, carries CoA into terminal distribution by the INTERNAL_IP4_ADDRESS among the CP (CFG_REPLY) of IKE_AUTH, and terminal obtains HoA in MIPv4 registration response.If MIPv6, then PDIF is setting up in the process of IKE with terminal, carry CoA by the INTERNAL_IP6_ADDRESS among the CP (CFG_REPLY) of IKE_AUTH, and be HoA of terminal distribution in CFG_REPLY by the attribute 3GPP-MIP6-HOA of expansion into terminal distribution.If simple IP (SIP-Simple IP), then PDIF carries IP address into terminal distribution setting up in the process of IKE by INTERNAL_IP4_ADDRESS among the CP (CFG_REPLY) of IKE_AUTH or INTERNAL_IP6_ADDRESS with terminal.

Simultaneously, in order to improve the competitiveness of 3GPP2 network, satisfy the demand of IP Packet Service, 3GPP2 organizes the research of carrying out network evolution, and the more representative network evolution model that proposes in the 3GPP2 meeting at present as shown in Figure 3.

In evolvement network framework shown in Figure 3, be provided with a new entity NMA (Network Mobility Agent) and (perhaps be called LMHA Local Mobility HomeAgent, in order to simplify, all be called NMA in the back), the effect of this entity is the mobility (such as between the CAP or between CAP and the PDIF) that can provide local, the address that guarantees terminal does not as far as possible change, for mobile IP, can also reduce the Binding Update of terminal and HA, thereby guarantee communication continuity.The IP network shape that IAD (comprising packet domain entities such as CAP, PDIF, PDSN) and NMA adopt links structure entirely, be that any one IAD can link to each other with any one NMA in theory, be the connected mode of multi-to-multi, its objective is in order in the session activation attitude, to reduce the heavily assignment of NMA as far as possible.When mobile between the different IADs takes place in terminal, if the IAD before and after switching is in same NMA scope, (for mobile IP is not need to upgrade CoA then not need more the address of new terminal, for simple IP is not need to upgrade the IP address), IAD is to the again binding of NMA initiation about this terminal simultaneously, make NMA when receiving the packet of issuing terminal, it can be transmitted to the IAD that present terminal connects, and then be transmitted to terminal by IAD.

Said process is transparent for terminal.The flow chart of Fig. 4 shows in evolution cdma network framework, under the MIP4 FA-COA pattern, terminal is carried out the flow process of MIP registration.

To be described in detail this flow process below.As shown in Figure 4, comprise following operation: set up between (1) terminal and the IAD (AGW) and eat dishes without rice or wine to connect and session connection; (2) terminal is finished access authentication; (3) AGW is the FA CoA of all terminals in DHCPv4 Serer obtains a NMA subnet of management; (4) AGW sends proxy announcement message to terminal as a proxy MIPFA, comprises the FA CoA that obtains previously in the message; (5) terminal sends and initiates MIP v4 register requirement, can ask indication to require dynamic HoA and HA; (6) AGW sends RRQ to NMA, the address (as the CoA among the MIP4) of binding AGW and the link-local address (as HoA) of terminal; (7) at this moment NMA as the FA of MIP4, initiates RADIUS/DIAMETER request verification register requirement and distributes HA to HAAA; (8) HAAA sends the RADIUS/DIAMETER response to NMA, if register requirement is proved to be successful, then comprises a HA address in the response; (9) set up IPSec SA between NMA (FA) and the HA; (10) NMA (FA) sends the register requirement of terminal to HA; (11) after HA receives register requirement, may ask the needed key of verification register requirement to HAAA, after verification was passed through, HA sent the response of succeeding in registration to NMA, and gave HoA of terminal assignments in response; (12) NMA forward pass RRP gives AGW; (13) AGW obtains the HoA of terminal from RRP message; (14) AGW sends RRP to terminal; (15) finish the MIP4 registration between AGW and the NMA, AGW has bound the IP address of the HoA and the IAD of terminal to NMA.

Like this, all setting up one section MIP4 tunnel between IAD and the NMA and between NMA and the HA respectively.

When terminal is mobile between different IADs (comprising CAP, PDIF), NMA before moving goes up if the IAD after moving can be connected to, the IP address of terminal just can remain unchanged under the CoA of terminal or the simple IP situation, at this moment terminal does not just need not initiate binding again to HA, only needs IAD just passable to the binding that NMA initiates the address of terminal and IAD IP address.

The problem that exists in the existing scheme is: after switching generation, how the purpose access network obtains the address of terminal, thereby the implementation method of the NMA that connects before selecting does not define.During particularly for the switching between heterogeneous network,, be very favourable for reducing handover delay if can realize such function.In addition, when switching between heterogeneous network, need to set up signaling between IAD and connect, the purpose IAD can obtain the related data of terminal to source access gateway like this, but how to obtain the address of source access gateway, does not also consider in the existing scheme.

Summary of the invention

The present invention is devoted to overcome the one or more inherent shortcomings in the above-mentioned correlation technique, for this reason, the invention provides a kind of portable terminal switching method and apparatus and a kind of source access gateway address acquisition methods and device, it is particularly useful for evolvement network, can keep the continuity of session.

According to an aspect of the present invention, provide a kind of portable terminal changing method.

Portable terminal changing method according to the present invention may further comprise the steps: first step, and after terminal switched to the purpose IAD from source access gateway, terminal sent first message to the purpose IAD, wherein carried the IP address of terminal before switching; Second step, in response to first message, the purpose IAD is searched corresponding networks mobile agent according to IP address of terminal; And third step, the purpose IAD sends mobile IP binding message to networks mobile agent, is used to bind the IP address of terminal and the IP address of purpose IAD.

Wherein, for mobile IP, the above-mentioned IP address is the Care-of Address or the home address of terminal, and for simple IP, the above-mentioned IP address is the IP address of terminal.

Terminal by cdma network under the situation that wlan network switches, in first step, first message is the IKE_AUTH message of Internet Key Exchange, be used to set up Internet Key Exchange and connect, terminal sends Care-of Address and home address to the purpose IAD by the IKE_AUTH of Internet Key Exchange.In addition, in second step, the purpose IAD is searched corresponding networks mobile agent according to IP address of terminal, and in third step, the IP address of binding IP address of terminal and purpose IAD.

Especially, adopt in terminal under the situation of MIP4 FA-COA pattern, in first step, in the IKE_AUTH of Internet Key Exchange message, terminal sends to the purpose IAD with Care-of Address and home address, and the attribute INTERNAL_IP4_ADDRESS among the CFG_REQUEST is made as home address before switching, and expands new attribute and transmit Care-of Address before switching.Adopt in terminal under the situation of MIP4 CCOA pattern, in first step, in the IKE_AUTH of Internet Key Exchange message, terminal is made as the attribute INTERNAL_IP4_ADDRESS among the CFG_REQUEST switches preceding Care-of Address.Adopt in terminal under the situation of MIP6 pattern, in first step, in the IKE_AUTH of Internet Key Exchange message, terminal is made as it with the attribute INTERNAL_IP6_ADDRESS among the CFG_REQUEST and switches preceding Care-of Address.

Adopt in terminal under the situation of simple IP v4 or simple IP v6 pattern, in first step, in the IKE_AUTH of Internet Key Exchange message, terminal is made as the preceding IP address of its switching with attribute INTERNAL_IP4_ADDRESS among the CFG_REQUEST or INTERNAL_IP6_ADDRESS, in second step, the purpose IAD is according to the corresponding networks mobile agent of IP address search, and in third step, the IP address of binding terminal and the IP address of purpose IAD.

In addition, terminal by wlan network under the situation that cdma network switches, in first step, first message is to carry out authentication message or the session message that connects, wherein carry and switch the preceding IP address of terminal or the address of source access gateway, wherein, carry out authentication message and be used for carrying out authentication, the session message that connects is used for connecting with the purpose IAD.

Especially, in second step, the purpose IAD is searched corresponding networks mobile agent by the terminal address that disposes each networks mobile agent and manage or the scope of terminal address prefix, perhaps search corresponding networks mobile agent by the query-relevant data storehouse, wherein, the address that each networks mobile agent manages or the scope of address prefix have been preserved in the Relational database.In addition, in third step, with the IP address of terminal as home address, with the IP address of purpose IAD as Care-of Address.

According to a further aspect in the invention, provide a kind of source access gateway address acquisition methods.

Source access gateway address acquisition methods according to the present invention may further comprise the steps: steps A, the purpose IAD sends inquiry request message to networks mobile agent, with the source access gateway address of inquiry terminal, wherein, carry the IP address of terminal in the inquiry request message; And step B, in response to inquiry request message, the address of networks mobile agent query source IAD, and return to the purpose IAD.

Wherein, source access gateway is meant terminal pairing gateway before switching, and the purpose IAD is meant terminal pairing gateway after switching.The home address that the address of terminal is an IAD when networks mobile agent carries out mobile IP binding, the address of source access gateway is and the corresponding Care-of Address of home address.

According to another aspect of the invention, provide another kind of source access gateway address acquisition methods.

Source access gateway address acquisition methods according to the present invention may further comprise the steps: steps A, after terminal switches to the purpose IAD from source access gateway, terminal wherein carries source access gateway address to the IKE_AUTH message of purpose IAD transmission Internet Key Exchange; And step B, in response to the IKE_AUTH message of Internet Key Exchange, the purpose IAD obtains source access gateway from the IKE_AUTH message of Internet Key Exchange address.

Wherein, the new attribute 3GPP2_SRC_AGW that expands in the IKE_AUTH message of terminal Internet Key Exchange after switching is set to the address of source access gateway.

Source access gateway address acquisition methods according to the present invention further may further comprise the steps: step C, purpose IAD and source access gateway connect, with the IP address that obtains terminal from source access gateway or other information that switch to preceding networks mobile agent address such as terminal.

According to an aspect of the present invention, provide a kind of portable terminal switching device shifter.

Portable terminal switching device shifter according to the present invention comprises: first message transmission module, be used for after terminal switches to the purpose IAD from source access gateway, sending first message to the purpose IAD, and wherein carry the IP address of terminal before switching; Networks mobile agent is searched module, in response to first message, searches corresponding networks mobile agent according to IP address of terminal; And mobile IP binding message sending module, be used for sending mobile IP binding message, with the IP address of binding terminal and the IP address of purpose IAD to networks mobile agent.

For mobile IP, the IP address is the Care-of Address or the home address of terminal, and for simple IP, the IP address is the IP address of terminal.

Terminal by cdma network under the situation that wlan network switches, first message is the IKE_AUTH message of Internet Key Exchange, be used to set up Internet Key Exchange and connect, terminal sends Care-of Address and home address to the purpose IAD by the Internet Key Exchange tunnel.

Networks mobile agent is searched module and is searched corresponding networks mobile agent according to IP address of terminal, and mobile IP binding message is used to bind the IP address of terminal and the IP address of purpose IAD.

Adopt in terminal under the situation of MIP4 FA-COA pattern, in the IKE_AUTH of Internet Key Exchange message, first message transmission module sends to the purpose IAD with Care-of Address and home address, and the attribute INTERNAL_IP4_ADDRESS among the CFG_REQUEST is made as home address before terminal is switched, and expands new attribute and transmit Care-of Address before switching.Adopt in terminal under the situation of MIP4 CCOA pattern, in the IKE_AUTH of Internet Key Exchange message, first message transmission module is made as terminal with the attribute INTERNAL_IP4_ADDRESS among the CFG_REQUEST and switches preceding Care-of Address.Adopt in terminal under the situation of MIP6 pattern, in the IKE_AUTH of Internet Key Exchange message, first message transmission module is made as terminal with the attribute INTERNAL_IP6_ADDRESS among the CFG_REQUEST and switches preceding Care-of Address.

Adopt in terminal under the situation of simple IP v4 or simple IP v6 pattern, in the IKE_AUTH of Internet Key Exchange message, first message transmission module is made as the preceding IP address of terminal switching with attribute INTERNAL_IP4_ADDRESS among the CFG_REQUEST or INTERNAL_IP6_ADDRESS, networks mobile agent is searched module according to the corresponding networks mobile agent of IP address search, and mobile IP binding message is used to bind the IP address of terminal and the IP address of purpose IAD.

Terminal by wlan network under the situation that cdma network switches, first message is to carry out authentication message or the session message that connects, and wherein carries the IP address of terminal before switching or the address of source access gateway.Wherein, carry out authentication message and be used for carrying out authentication, the session message that connects is used for connecting with the purpose IAD.

Networks mobile agent is searched module and is searched corresponding networks mobile agent by the terminal address that disposes each networks mobile agent and manage or the scope of terminal address prefix, perhaps search corresponding networks mobile agent by the query-relevant data storehouse, wherein, the address that each networks mobile agent manages or the scope of address prefix have been preserved in the Relational database.

Especially, with the IP address of terminal of binding as home address, with the IP address of purpose IAD as Care-of Address.

According to a further aspect in the invention, provide a kind of source access gateway address deriving means.

Source access gateway address deriving means according to the present invention comprises: the inquiry request message sending module, be used for sending inquiry request message to networks mobile agent, with the source access gateway address of inquiry terminal, wherein, carry the IP address of terminal in the inquiry request message; And the address lookup module, in response to inquiry request message, the address of address lookup module query source IAD, and return to the inquiry request message sending module.

Source access gateway address deriving means according to the present invention comprises: the IKE_AUTH message transmission module of Internet Key Exchange, be used for after terminal switches to the purpose IAD from source access gateway, IKE_AUTH message to purpose IAD transmission Internet Key Exchange wherein carries source access gateway address; And the source access gateway address acquisition module, be used for IKE_AUTH message, the address that from the IKE_AUTH message of Internet Key Exchange, obtains source access gateway in response to Internet Key Exchange.

Wherein, after terminal was switched, the new attribute 3GPP2_SRC_AGW that expands in the IKE_AUTH message of the IKE_AUTH message transmission module Internet Key Exchange of Internet Key Exchange was set to the address of source access gateway.

Source access gateway address deriving means according to the present invention further comprises: the information acquisition module, be used for connecting, with the IP address that obtains terminal from source access gateway or other information of switching networks mobile agent address before such as terminal with source access gateway.

By above technical scheme, the present invention has realized following beneficial effect: saved interface-free resources, guaranteed the continuity of session better.

Description of drawings

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

Fig. 1 is the schematic diagram that is illustrated in the model of terminal realization network interworking under the MIP;

Fig. 2 illustrates the signaling process figure that a terminal is dynamically obtained HoA;

Fig. 3 is the schematic diagram that example networks evolution model is shown;

Fig. 4 illustrates the signaling process figure that carries out the MIP registration process according to the terminal of correlation technique;

Fig. 5 is the flow chart that illustrates according to the portable terminal changing method of first embodiment of the invention;

Fig. 6 illustrates according to the terminal of first embodiment of the invention to switch to wlan network and adopt the signaling process figure of MIP4 from cdma network;

Fig. 7 illustrates according to the terminal of first embodiment of the invention to switch to wlan network and adopt the signaling process figure of MIP6 from cdma network;

Fig. 8 illustrates according to the terminal of first embodiment of the invention to switch to wlan network and adopt the signaling process figure of SIP4 from cdma network;

Fig. 9 is the flow chart that illustrates according to the source access gateway address acquisition methods of second embodiment of the invention;

Figure 10 is the flow chart that illustrates according to the source access gateway address acquisition methods of third embodiment of the invention;

Figure 11 is the signaling process figure that illustrates according to the source access gateway address acquisition methods of third embodiment of the invention;

Figure 12 is the block diagram that illustrates according to the portable terminal switching device shifter of fourth embodiment of the invention;

Figure 13 is the block diagram that illustrates according to the source access gateway address deriving means of fifth embodiment of the invention; And

Figure 14 is the block diagram that illustrates according to the source access gateway address deriving means of sixth embodiment of the invention.

Embodiment

Specifically describe the preferred embodiments of the present invention hereinafter with reference to accompanying drawing, wherein, accompanying drawing constitutes the application's a part, and is used from explaination principle of the present invention with embodiments of the invention one.

First embodiment

In according to the first embodiment of the present invention, provide a kind of portable terminal changing method.Describe the first embodiment of the present invention hereinafter with reference to Fig. 5 to Fig. 8, wherein, Fig. 5 is the flow chart that illustrates according to the terminal switching method of first embodiment of the invention.

As shown in Figure 5, portable terminal changing method according to first embodiment of the invention may further comprise the steps: step S502, after terminal switched to the purpose IAD from source access gateway, terminal sent first message to the purpose IAD, wherein carried the IP address of terminal before switching; Step S504, in response to first message, the purpose IAD is searched corresponding networks mobile agent according to IP address of terminal; And step S506, the purpose IAD sends mobile IP binding message to networks mobile agent, is used to bind the IP address of terminal and the IP address of purpose IAD.

Terminal by cdma network under the situation that wlan network switches, in step S502, first message is the IKE_AUTH message of Internet Key Exchange, be used to set up Internet Key Exchange and connect, terminal sends Care-of Address and home address to the purpose IAD by the IKE_AUTH of Internet Key Exchange.In addition, in step S504, the purpose IAD is searched corresponding networks mobile agent according to IP address of terminal, and in step S506, the IP address of binding IP address of terminal and purpose IAD.

Especially, adopt in terminal under the situation of MIP4 FA-COA pattern, in step S502, in the IKE_AUTH of Internet Key Exchange message, terminal sends to the purpose IAD with Care-of Address and home address, and the attribute INTERNAL_IP4_ADDRESS among the CFG_REQUEST is made as home address before switching, and expand new attribute and transmit Care-of Address before switching:

Attribute?Type	Value	Multi-Valued	Length	?Description
					3GPP2_MIP4_COA	16389	NO	0?or?4?octets	Terminal is used to refer to the CoA address

Adopt in terminal under the situation of MIP4 CCOA pattern, in step S502, in the IKE_AUTH of Internet Key Exchange message, terminal is made as the attribute INTERNAL_IP4_ADDRESS among the CFG_REQUEST switches preceding Care-of Address.Adopt in terminal under the situation of MIP6 pattern, in step S502, in the IKE_AUTH of Internet Key Exchange message, terminal is made as it with the attribute INTERNAL_IP6_ADDRESS among the CFG_REQUEST and switches preceding Care-of Address.Wherein, Fig. 6 to Fig. 8 shows terminal respectively and adopts MIP4, MIP6, SIP4 to switch to the signaling process figure of wlan network from cdma network respectively.

Adopt in terminal under the situation of simple IP v4 or simple IP v6 pattern, in step S502, in the IKE_AUTH of Internet Key Exchange message, terminal is made as the preceding IP address of its switching with attribute INTERNAL_IP4_ADDRESS among the CFG_REQUEST or INTERNAL_IP6_ADDRESS, in step S504, the purpose IAD is according to the corresponding networks mobile agent of IP address search, and in step S506, the IP address of binding terminal and the IP address of purpose IAD.

In addition, terminal by wlan network under the situation that cdma network switches, in step S502, first message is to carry out authentication message or the session message that connects, wherein carry and switch the preceding IP address of terminal or the address of source access gateway, wherein, carry out authentication message and be used for carrying out authentication, the session message that connects is used for connecting with the purpose IAD.

Especially, in step S504, the purpose IAD is searched corresponding networks mobile agent by the terminal address that disposes each networks mobile agent and manage or the scope of terminal address prefix, perhaps search corresponding networks mobile agent by the query-relevant data storehouse, wherein, the address that each networks mobile agent manages or the scope of address prefix have been preserved in the Relational database.In addition, in step S506, with the IP address of terminal as home address, with the IP address of purpose IAD as Care-of Address.

Second embodiment

In according to a second embodiment of the present invention, provide a kind of source access gateway address acquisition methods.Describe the second embodiment of the present invention hereinafter with reference to Fig. 9, wherein, Fig. 9 is the flow chart that illustrates according to the source access gateway address acquisition methods of second embodiment of the invention.

As shown in Figure 9, source access gateway address acquisition methods according to second embodiment of the invention may further comprise the steps: step S902, the purpose IAD sends inquiry request message to networks mobile agent, source access gateway address with inquiry terminal, wherein, carry the IP address of terminal in the inquiry request message; And step S904, in response to inquiry request message, the address of networks mobile agent query source IAD, and return to the purpose IAD.

In order to realize above-mentioned functions, can do some expansions to mobile IP, possible method comprises:

(1) in mobile IP, increase the function of inquiring about present CoA by HoA, that is to say that certain entity sends request to HA, comprised HoA in this request, and HA can return to this entity with current CoA after receiving request; Like this, the purpose IAD is with the IP address of terminal, and promptly HoA sends to NMA (HA just), and NMA can be with CoA, and promptly the IP address of source access gateway returns to the purpose IAD.

(2) when certain entity is done the heavily binding of address, ask original CoA, HA also returns to this entity with original CoA after binding new CoA and HoA successfully; Send Binding Update or register requirement with the address of oneself with during the IP address binding of terminal to NMA when the purpose IAD like this, also ask the address of former CoA simultaneously, NMA can be in binding acknowledgement or registration reply message like this, with original C oA, just the purpose IAD is issued in the address of source access gateway.

The 3rd embodiment

In a third embodiment in accordance with the invention, provide another kind of source access gateway address acquisition methods.Describe the third embodiment of the present invention hereinafter with reference to Figure 10 and Figure 11, wherein, Figure 10 is the flow chart that illustrates according to the source access gateway address acquisition methods of third embodiment of the invention.

As shown in figure 10, source access gateway address acquisition methods according to third embodiment of the invention may further comprise the steps: step S1002, after terminal switches to the purpose IAD from source access gateway, terminal wherein carries source access gateway address to the IKE_AUTH message of purpose IAD transmission Internet Key Exchange; And step S1004, in response to the IKE_AUTH message of Internet Key Exchange, the purpose IAD obtains source access gateway from the IKE_AUTH message of Internet Key Exchange address.

Wherein, the new attribute 3GPP2_SRC_AGW that expands in the IKE_AUTH message of terminal Internet Key Exchange after switching is set to the address of source access gateway.Expand to the 3GPP2 certain relevant attribute in the IKEv2 Configuration Payload message as follows:

Attribute?Type	Value	Multi-Valued	Length	Description
					3GPP2_SRC_AGW	16390	NO	0?or?4 octets?or 16?octets	The address of IAD before terminal is used to refer to and switches

Source access gateway address acquisition methods according to third embodiment of the invention further may further comprise the steps: step S1006, purpose IAD and source access gateway connect, with IP address or other information (comprising that terminal switches to the relevant parameter of preceding networks mobile agent address, safe key, OoS etc.) of obtaining terminal from source access gateway.After this, the purpose IAD is initiated the binding of IP address of terminal (for simple IP is the IP address of terminal, is the home address HoA of terminal for mobile IPv 4, is the Care-of Address CoA of terminal for mobile IP v 6) and purpose access gateway address to NMA.

The 4th embodiment

In a fourth embodiment in accordance with the invention, provide a kind of portable terminal switching device shifter.Describe the fourth embodiment of the present invention hereinafter with reference to Figure 12, wherein, Figure 12 is the block diagram that illustrates according to the portable terminal switching device shifter of fourth embodiment of the invention.

As shown in figure 12, portable terminal switching device shifter 1200 according to fourth embodiment of the invention comprises: first message transmission module 1202, be used for after terminal switches to the purpose IAD from source access gateway, send first message to the purpose IAD, wherein carry the IP address of terminal before switching; Networks mobile agent is searched module 1204, in response to first message, searches corresponding networks mobile agent according to IP address of terminal; And mobile IP binding message sending module 1206, be used for sending mobile IP binding message, with the IP address of binding terminal and the IP address of purpose IAD to networks mobile agent.

Networks mobile agent is searched module 1204 and is searched corresponding networks mobile agent according to IP address of terminal, and mobile IP binding message is used to bind the IP address of terminal and the IP address of purpose IAD.

Adopt in terminal under the situation of MIP4 FA-COA pattern, in the IKE_AUTH of Internet Key Exchange message, first message transmission module 1202 sends to the purpose IAD with Care-of Address and home address, and the attribute INTERNAL_IP4_ADDRESS among the CFG_REQUEST is made as home address before terminal is switched, and expands new attribute and transmit Care-of Address before switching.Adopt in terminal under the situation of MIP4 CCOA pattern, in the IKE_AUTH of Internet Key Exchange message, first message transmission module 1202 is made as terminal with the attribute INTERNAL_IP4_ADDRESS among the CFG_REQUEST and switches preceding Care-of Address.Adopt in terminal under the situation of MIP6 pattern, in the IKE_AUTH of Internet Key Exchange message, first message transmission module 1202 is made as terminal with the attribute INTERNAL_IP6_ADDRESS among the CFG_REQUEST and switches preceding Care-of Address.

Adopt in terminal under the situation of simple IP v4 or simple IP v6 pattern, in the IKE_AUTH of Internet Key Exchange message, first message transmission module 1202 is made as the preceding IP address of terminal switching with attribute INTERNAL_IP4_ADDRESS among the CFG_REQUEST or INTERNAL_IP6_ADDRESS, networks mobile agent is searched module 1204 according to the corresponding networks mobile agent of IP address search, and mobile IP binding message is used to bind the IP address of terminal and the IP address of purpose IAD.

Networks mobile agent is searched module 1204 and is searched corresponding networks mobile agent by the terminal address that disposes each networks mobile agent and manage or the scope of terminal address prefix, perhaps search corresponding networks mobile agent by the query-relevant data storehouse, wherein, the address that each networks mobile agent manages or the scope of address prefix have been preserved in the Relational database.

The 5th embodiment

In according to a fifth embodiment of the invention, provide a kind of source access gateway address deriving means.Describe the fifth embodiment of the present invention hereinafter with reference to Figure 13, wherein, Figure 13 is the block diagram that illustrates according to the source access gateway address deriving means of fifth embodiment of the invention.

As shown in figure 13, source access gateway address deriving means 1300 according to fifth embodiment of the invention comprises: inquiry request message sending module 1302, be used for sending inquiry request message to networks mobile agent, source access gateway address with inquiry terminal, wherein, carry the IP address of terminal in the inquiry request message; And address lookup module 1304, in response to inquiry request message, the address of address lookup module 1304 query source IADs, and return to the inquiry request message sending module.

The 6th embodiment

In according to a sixth embodiment of the invention, provide another kind of source access gateway address deriving means.Describe the fifth embodiment of the present invention hereinafter with reference to Figure 14, wherein, Figure 14 is the block diagram that illustrates according to the source access gateway address deriving means of sixth embodiment of the invention.

As shown in figure 14, source access gateway address deriving means 1400 according to sixth embodiment of the invention comprises: the IKE_AUTH message transmission module 1402 of Internet Key Exchange, be used for after terminal switches to the purpose IAD from source access gateway, IKE_AUTH message to purpose IAD transmission Internet Key Exchange wherein carries source access gateway address; And source access gateway address acquisition module 1404, be used for IKE_AUTH message, the address that from the IKE_AUTH message of Internet Key Exchange, obtains source access gateway in response to Internet Key Exchange.

Wherein, after terminal was switched, the new attribute 3GPP2_SRC_AGW that expands in the IKE_AUTH message of IKE_AUTH message transmission module 1402 Internet Key Exchange of Internet Key Exchange was set to the address of source access gateway.

Source access gateway address deriving means 1400 according to the present invention further comprises: information acquisition module 1406, be used for connecting, with the IP address that obtains terminal from source access gateway or other information of switching networks mobile agent address before such as terminal with source access gateway.

The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims

1. a portable terminal changing method is characterized in that, may further comprise the steps:

First step, after terminal switched to the purpose IAD from source access gateway, described purpose IAD received first message from described terminal, wherein carried the IP address of described terminal before switching;

Second step, in response to described first message, described purpose IAD is according to the IP address search corresponding networks mobile agent of described terminal before switching; And

Third step, described purpose IAD sends mobile IP binding message to described networks mobile agent, be used to bind described terminal before switching the IP address and the IP address of described purpose IAD.

2. portable terminal changing method according to claim 1 is characterized in that, for mobile IP, described IP address is the Care-of Address or the home address of described terminal, and for simple IP, described IP address is the IP address of described terminal.

3. portable terminal changing method according to claim 2, it is characterized in that, described terminal by cdma network under the situation that wlan network switches, in described first step, the IKE_AUTH message that described first message is Internet Key Exchange, be used to set up Internet Key Exchange and connect, described terminal sends described Care-of Address and described home address to described purpose IAD by the IKE_AUTH message of described Internet Key Exchange.

4. portable terminal changing method according to claim 3, it is characterized in that, adopt in described terminal under the situation of MIP4 FA-COA pattern, in described first step, in the IKE_AUTH of described Internet Key Exchange message, described terminal sends to described purpose IAD with described Care-of Address and described home address, and the attribute INTERNAL_IP4_ADDRESS among the CFG_REQUEST is made as described home address before switching, and expands new attribute and transmit described Care-of Address before switching.

5. portable terminal changing method according to claim 3, it is characterized in that, adopt in described terminal under the situation of MIP4 CCOA pattern, in described first step, in the IKE_AUTH of described Internet Key Exchange message, described terminal is made as the attribute INTERNAL_IP4_ADDRESS among the CFG_REQUEST switches preceding described Care-of Address.

6. portable terminal changing method according to claim 3, it is characterized in that, adopt in described terminal under the situation of MIP6 pattern, in described first step, in the IKE_AUTH of described Internet Key Exchange message, described terminal is made as it with the attribute INTERNAL_IP6_ADDRESS among the CFG_REQUEST and switches preceding described Care-of Address.

7. portable terminal changing method according to claim 3, it is characterized in that, adopt in described terminal under the situation of simple IP v4 or simple IP v6 pattern, in described first step, in the IKE_AUTH of described Internet Key Exchange message, described terminal is made as the preceding described IP address of its switching with attribute INTERNAL_IP4_ADDRESS among the CFG_REQUEST or INTERNAL_IP6_ADDRESS, in described second step, described purpose IAD is according to the IP address search corresponding networks mobile agent of described terminal before switching, and in described third step, bind described terminal before switching the IP address and the IP address of described purpose IAD.

8. portable terminal changing method according to claim 2, it is characterized in that, described terminal by wlan network under the situation that cdma network switches, in described first step, described first message is to carry out authentication message or the session message that connects, and wherein carries the IP address of described terminal before switching.

9. portable terminal changing method according to claim 8 is characterized in that, described execution authentication message is used for carrying out authentication, and the described session message that connects is used for connecting with described purpose IAD.

10. portable terminal changing method according to claim 1, it is characterized in that, in described second step, described purpose IAD is searched corresponding networks mobile agent by the terminal address that disposes each networks mobile agent and manage or the scope of terminal address prefix.

11. portable terminal changing method according to claim 1, it is characterized in that, in described second step, described purpose IAD is searched corresponding networks mobile agent by the query-relevant data storehouse, wherein, the address that each networks mobile agent manages or the scope of address prefix have been preserved in the described Relational database.

12. portable terminal changing method according to claim 1 is characterized in that, in described third step, with the IP address of described terminal before switching as home address, with the IP address of described purpose IAD as Care-of Address.