CN101523855A

CN101523855A - Packet-forwarding method for proxy mobile IP

Info

Publication number: CN101523855A
Application number: CNA200780037686XA
Authority: CN
Inventors: V·卡库莱夫; A·拉伊库马尔; G·S·桑达拉姆
Original assignee: Lucent Technologies Inc
Current assignee: Nokia of America Corp
Priority date: 2006-10-10
Filing date: 2007-10-09
Publication date: 2009-09-02

Abstract

The packet-forwarding for proxy mobile IP1 in accordance with various embodiments, includes registering a mobile access terminal (AT) and a first IP gateway (IPGW) with a home agent (HA) when a wireless communication session is established between the mobile AT and the first IPGW. In various embodiments the method additionally includes transferring context information regarding the mobile AT and aproxy mobile security key obtained by the first IPGW, from the first IPGW to a second IPGW when the mobile AT moves from a first access network to a second access network.

Description

The packet-forwarding method that is used for proxy-mobile IP

The cross reference of related application

The application requires the priority of the U.S. Provisional Application 60/850,709 of submission on October 10th, 2006.More than being disclosed in herein of application all is incorporated herein by reference.

Technical field

The statement of this part only provides with the present invention and discloses relevant background information, not necessarily constitutes prior art.

Content of the present invention relates to and is used for the mobile grouping route that accesses terminal mobile between two access nodes.

Background technology

In wired IP network, client and server use Internet protocol (IP) address each other identifies each other and communicates by letter.Sender's IP address (source IP address) and recipient's IP address (purpose IP address) are carried in each IP grouping.Intermediate routers and switch are checked source/purpose IP address, come from the source to the destination routing packets.Method based on the IP address routing packets in the grouping is known.Usually, the IP address of client or permanent or dynamic assignment.Under arbitrary situation, by the Address Management Server decision address that is commonly called Dynamic Host Configuration Protocol server, all clients in the subnet have a bit public same sex on their address.

In fact, this has created the hierarchy of how managing with executive address, and is purpose to help route and repeating process, described route and repeating process process IP address.Yet in wireless network, mobile client or access terminal (AT) move everywhere, not from the same position initiation session.Someone advocates, whenever AT moves to another from an access point (AP) or base station, just changes the IP address.This can cause two problems: the first, be not easy to change the IP address of AT; The second, router need be updated new address in some way, so that now can be by route differently from grouping server, that be used for same mobile AT that is also referred to as communication node (CN).

Solve these problems by so-called mobile IP standard and agreement, described mobile IP standard and agreement are provided for realizing the IP address management of mobile AT and the framework of route.Basic idea is, has to constant " local address " of mobile AT (HoA), and has " Care-of Address " relevant with the position of AT (CoA) (usually based on access network IP address) in addition.When mobile AT during to another, allows CoA to change from a node motion.In this framework, the mobile IP protocol that uses for example MIPv4, MIPv6 etc. is located with HoA and CoA " binding " each other at local agent (HA), and local agent (HA) is known CoA and the HoA of mobile AT, and safeguards binding relationship.Therefore, when CN when mobile AT sends grouping, described grouping is routed by HA, HA is sent to described grouping mobile AT present located access network or node conversely again.The mechanism that two types distribution CoA usually, is arranged.First method is used the CoA be arranged in network, and for example, the CoA that each of given access network unit that is connected to PDSN for example moves AT can equal the IP address of described PDSN.In the second approach, mobile AT is based on its CoA of network prefix generation of access network, and perhaps mobile AT distributes specific CoA by access network.The method of this generation CoA often is called as common location CoA (Co-located CoA) or (C-CoA).

Yet, when using the C-CoA of mobile AT, can not switch by the access network management fully.Just, C-CoA is calculated by mobile AT, and must register at HA.Usually, calculate C-CoA based on the network prefix of access network with specific to the persistent identifier of mobile AT.Usually, obtain described network prefix by router advertisement from anchoring, for example PDSN the with it access network of mobile AT unit.

Usually, two types mobile IP protocol is arranged, that is, and based on the client mobile IP (CMIP) and the based on network proxy-mobile IP (PMIP) of terminal.In CMIP, all binding relationships are initiated by mobile AT, and in PMIP, all binding relationships are initiated by the network element of the mobile AT of representative.

In client mobile IP (CMIP), relate to mobile AT, local agent (HA), authentication (AAA) infrastructure and the gateway in the network possibly alternately such as packet data serving node (PDSN).Usually, the quantity of given mutual and network element, setting up the CMIP session is " slowly ", may take general a few tens of milliseconds to arrive the hundreds of millisecond.In proxy-mobile IP (PMIP),, set up the PMIP session and can significantly accelerate because mobile management is undertaken by network.Yet,, must must solve safety problem in order to set up the PMIP session.

Summary of the invention

According to different embodiment disclosed by the invention, provide a kind of method that is used for based on network mobile management.Described method can comprise when moving access terminal (AT) and first IP gateway (IPGW) between when setting up wireless communication sessions, register a described mobile AT and a described IPGW to local agent (HA).Described method can comprise in addition when described mobile AT when first access network moves to second access network, shift about the contextual information of described mobile AT with by what a described IPGW obtained to the 2nd IPGW from a described IPGW and to act on behalf of the mobile security key.

According to various other embodiment disclosed by the invention, a kind of method that is used for based on network mobile management is provided, described method can comprise when moving access terminal (AT) and first IP gateway (IPGW) between when initiating mobile IP session, utilize by the mobility home agent route key of acting on behalf of of described IPGW acquisition and between a described IPGW and local agent (HA), set up proxy link.Described method can comprise in addition that the described same agent mobility home agent route key that is used to set up described proxy link by use sets up link between described local agent and described AT, registers described AT to described HA.In various realizations, described method may further include as described mobile AT and changes into from communicating by letter with first access network when communicating by letter with second access network, shifts contextual information and the described mobility home agent route key of acting on behalf of about described mobile AT from a described IPGW to the 2nd IPGW.Further, described method can comprise that use sets up link from described contextual information and the described mobility home agent route key of acting on behalf of that a described IPGW obtains between described the 2nd IPGW and described HA, flows between described mobile AT and described HA via described the 2nd IPGW to provide the tunnel to be used for packet.

In other embodiment disclosed by the invention, a kind of method that is used for based on network mobile management is provided, described method can comprise when moving access terminal (AT) and first IP gateway (IPGW) between when initiating mobile IP session, register described mobile AT to local agent (HA).In addition, described method can comprise utilizing by a described IPGW sets up proxy link from the mobility home agent route key of acting on behalf of that authentication (AAA) obtains between a described IPGW and described HA, register a described IPGW to described HA.In addition, described method can comprise when described mobile AT switch with first access network that is linked to a described IPGW communicate by letter with the communicating by letter of second access network that is linked to the 2nd IPGW the time, from a described IPGW to contextual information and described the act on behalf of mobility home agent route key of described the 2nd IPGW transfer about described mobile AT.Further, described method can comprise that utilization sets up link from described contextual information and the described mobility home agent route key of acting on behalf of that a described IPGW obtains between described the 2nd IPGW and described HA, to be provided for the tunnel that packet is flowed between described mobile AT and described HA via described second access network and described the 2nd IPGW.

To become apparent in the description that the further suitable application area of content of the present invention provides from here.Should be appreciated that described description and specific examples only are intended to be used for illustration purpose, rather than be intended to limit the scope of content of the present invention.

Description of drawings

Accompanying drawing described herein only is used for illustration purpose, never is intended to limit the scope of content of the present invention.

Fig. 1 illustrates according to the operation of the IP gateway in the wireless network of different embodiments of the invention to the IP gateway interface;

Fig. 2 illustrates according to the operation to the IP gateway interface of the IP gateway in wireless network shown in Figure 1 of different embodiment, wherein, realizes the IPv6 agreement in described wireless network;

Fig. 3 illustrates the IP gateway in wireless network shown in Figure 1 according to different embodiment to the IP gateway interface, wherein, realizes the IPv4 agreement in described wireless network;

Fig. 4 is illustrated in the interior IP gateway of wireless network shown in Figure 3 to the IP gateway interface, wherein, postpones in described wireless network; And

Fig. 5 illustrates the exemplary packet header that will realize in the operation of IP gateway interface in described IP gateway shown in Figure 1 according to different embodiments of the invention.

Embodiment

Referring now to accompanying drawing example embodiment is described more fully.But, can should not be interpreted as the example embodiment that only limits to state herein with a lot of multi-form embodiment example embodiment.Provide example embodiment so that the disclosure will be comprehensively completely, and will fully pass on invention scope to those skilled in the art.In some example embodiment, be not described in detail known procedures, known device structure and known technology, to avoid the making explanation of example embodiment unclear.Spread all over described specifications, same invoking marks is represented same unit in the accompanying drawing.

Although in addition, it should be understood that and can use the term first, second, third, etc. to describe various unit and/or parts herein, these unit and/or parts are not limited by these terms should.These terms may only be used to distinguish a unit or parts and another unit or parts.Thereby under the situation of the content that does not deviate from example embodiment, first module discussed below or parts can be called as Unit second or parts.

In addition, the term of Shi Yonging only is used to describe the purpose of specific example embodiment herein, is not intended to restriction.As used herein, " one ", " basis " and " described " can be intended to also comprise a plurality of, unless the clear in addition indication of context.Further will understand, when in these specifications, using, term " comprises " feature, integer, step, operation, unit and/or the parts that illustrate that existence is stated, but does not get rid of existence or add one or more further features, integer, step, operation, unit, parts and/or their group.

Further, unless otherwise defined, all terms used herein (comprising technical and learned term) have the same meaning that those of ordinary skill in the art understands.Further will understand, described term, such as in the general dictionary that uses defined those, should be interpreted as having and the consistent meaning of they meanings in the association area context, rather than on desirable or excessively formal meaning, explained, unless clear and definite herein definition like this.

In different embodiment, the present invention openly provides structure and the method for utilizing proxy-mobile IP (PMIP) to create binding between local address (HoA) that moves access terminal (AT) and Care-of Address (CoA).As used herein, HoA is the fixed ip address of mobile AT, do not move change with mobile AT, and CoA is the temporary ip address of mobile AT, is allowed to the position change based on mobile AT.Mutual with mobile AT removed between transfer period in the HoA of mobile AT and the binding between the CoA, between described transfer period promptly when with the communicating by letter when an access node (AN) changes to another access node (AN) of mobile AT.For example, in various realizations, distribute HoA and CoA, and locate to set up the binding relationship between the described address of mobile AT at local agent (HA) for each moves AT.More particularly, HoA for example for good and all or alternately is fixed in each session, and the CoA of mobile AT can change when mobile AT moves and is switched.And the network prefix of the access network gateway of for example PDSN that mobile AT connects with it based on first IP gateway (IPGW) or mobile AT generates its CoA.Yet, can be connected in the centralized architecture of identical IP gateway in a plurality of base stations, CoA can change with each IP gateway.

In addition, in different embodiment, structure disclosed by the invention and method do not require the router advertisement from IP gateway (IPGW) after switching, because CoA or based on network CoA are recomputated by new IPGW, for example, the new PDSN that mobile AT anchored to.Yet because CoA is calculated by mobile AT during session is set up, the network prefix of first tie point need be communicated to mobile AT in the very first time.Alternatively, as described above, CoA can only be calculated by mobile AT, in some cases, can be assigned with by IAD.For example, in the mobile IPv 4 scene, the IP address of IAD can be used as the CoA of mobile AT.

To use following convention herein.Herein in the exemplary embodiment of Miao Shuing, IP gateway (IPGW) or bear the network element of acting on behalf of responsibility that each moves AT can be called as sometimes herein as being applicable to current EvDO grouping of network data serving node (PDSN).Yet, should be appreciated that such network element can be that IP layer locomotive function and any IPGW in the open scope of the present invention can be provided.In addition, when switching occurs between an IPGW and another, an IPGW will be called as service IP GW herein, and the 2nd IPGW will be called as Target IP GW herein.In addition, term mobile node (MN), mobile radio station (MS) and move access terminal (AT) and will be used changeably alternately herein.Further, all example message described herein and form are based on the term that is applicable to current and emerging EvDO system based on 3GPP2.Yet, should be appreciated that method described herein is more widely applicable for any system, for example, WiMAX, based on LTE of 3GPP etc., and such being widely used in the scope disclosed by the invention.

Fig. 1 illustrates the operation to the IPGW interface according to the IPGW in cordless communication network 10 of different embodiments of the invention.Usually, network 10 comprises and moves access terminal (AT) 14, first or source access node (AN) 16, second or target AN18, first or service IP gateway (IPGW) 20, second or Target IP GW 22, local agent (HA) 24 and AAA server (AAA) 26.In different embodiment, when the user that accesses terminal initiated radio communication via network 10, the source access network 16 that has begun to communicate by letter with it via AT 14 between mobile AT 14 and service IPGW 20 was set up mobile IP session, shown in 104.Mobile AT can be any Wireless Telecom Equipment such as laptop computer, PDA, cellular handset etc.In case set up session between mobile AT 14 and service IPGW 20, service IP GW 20 and mobile AT 14 are all to HA 24 registrations, shown in 108.More specifically, mobile AT 14 connects with HA 24, and service IP GW 20 and HA 24 set up proxy link, and create binding at HA 24 places.Described binding is with HoA and the CoA binding of service IP GW 20 with mobile AT 14.

After binding is created at 108 places, if mobile AT 14 (for example moves, stop to communicate by letter with source AN 16, beginning is communicated by letter with the target AN 18 that is connected to Target IP GW 22), the data route that data between switching HA 24 and the service IPGW 20 are routed between HA 24 and the Target IP GW 22 necessitates, shown in 112 and 116.In different embodiment,, between service IP GW 20 and Target IP GW 22, set up safety and connect in order to realize described switching.Then, shift about the contextual information of mobile AT 14 with by service IP GW20 to Target IP GW 22 from service IP GW20 and to act on behalf of the mobile security key, shown in 120 from what AAA 26 obtained.More particularly, the exchange of mobile AT contextual information is with under the situation that mobile AT 14 or AAA 26 communicate by letter not finish between Target IP GW 22 and the service IPGW 20.Thereby it is transparent to mobile AT 14 that Target IP GW 22 obtains described contextual information.

In case Target IP GW obtains described mobile AT contextual information, create binding at bound targets IPGW 22 and the HoA of mobile AT 14 and HA 24 places of CoA, shown in 124.Create the tunnel between the Target IP GW22 that described HA of being bundled in 24 and mobile AT 14 are connected to via target AN 18, shown in 128.Therefore, packet can be at HA 24 and Target IP GW

Flow between 22, and subsequently to flow from mobile AT14, shown in 132.

If mobile AT 14 moves once more, and begin to communicate by letter with the fresh target AN (not shown) that is connected to new IPGW (not shown), mobile AT contextual information will be transferred to described new IPGW, describe as above 120 places.In addition, the HoA of described new IPGW and mobile AT 14 and the binding of CoA will be created, and describe as above 124 places, open the tunnel and allow HA24 and described new IPGW between packet flows, describe as above 128 and 132 places.

Fig. 2 illustrate according to different embodiment as utilize IPGW in the wireless network 10 that the IPv6 agreement realizes to the IPGW interface.As described above, when the user that accesses terminal initiates radio communication, between mobile AT14 and service IPGW 20, set up mobile IP session, shown in 104.In different embodiment, can pass through suitable LCP (LCP), be used for Chap or the PAP of authentication and authorization to set up safety chain, set up mobile IP session.

According to different embodiment,, shown in 108, can comprise the following sequence of operation to HA 24 enrolled for service IPGW 20 and mobile AT 14.At first, mobile AT 14 sends configuring request to service IP GW 20, shown in 108-A1, so that mobile AT 14 can begin to obtain HoA from HA 24.The configuring request at 108-A1 place is in network 10 internal trigger proxy-mobile IP (PMIP) sessions.Service IP GW 20 interceptings send the subsequent configuration request from the configuring request of mobile AT 14 to AAA 26, to obtain the acting on behalf of mobile security key, shown in 108-A2.Correspondingly, the mobile AT 14 of AAA 26 identification has and both can carry out client-based mobile IP and also can carry out ability based on agency's mobile IP.AAA 26 returns response to service IP GW 20 then, and shown in 108-A3, described response comprises the information of the HA 24 that will communicate by letter with it about service IP GW 20.For example, described information can comprise the HoA and the safe key of proxy mobile node local agent route key for example, and is related to set up between service IP GW 20 and HA 24.

In case service IP GW 20 receives the information at 108-A3 place, service IP GW 20 uses the safe key that obtains at the 108-A3 place, sends Binding Update (BU) message to HA24, shown in 108-A4.In addition, HA 24 returns binding acknowledgement (BA) to service IP GW 20, as equally shown in the 108-A4, thus, finishes to HA24 enrolled for service IPGW 20.Thereby, set up the proxy link between service IP GW 20 and the HA 24, and created binding at binding service IP GW 20 and HA 24 places of the HoA of mobile AT 14, shown in 108-A5.

At the 108-A6 place, service IP GW 20 sends to mobile AT 14 and comprises that the configuration of HoA accepts message.At the 108-A7 place, mobile AT 14 calculates the CoA that is exclusively used in mobile AT 14, and sends Binding Update (BU) to HA 24.HA 24 sends it back binding acknowledgement (BA) to mobile AT 14 then, finishes thus to the mobile AT 14 of HA 24 registrations.HA 24 is updated in the binding that the 108-A5 place is created with described CoA then, binds service IP GW 20, HoA and CoA thus, and is indicated as 108-A8.

As described above, at 112 and 114 places, mobile AT14 moves (for example, stop to communicate by letter with source AN 16, begin to communicate by letter with the target AN 18 that is connected to Target IP GW 22).Therefore, the data route that the data between switching HA 24 and the service IPGW 20 are routed between HA 24 and the Target IP GW 22 necessitates.According to different embodiment, shift mobile AT contextual information from service IP GW 20 to Target IP GW 22, shown in 120, can comprise the following sequence of operation.At first, between target AN 18 and Target IP GW 22, set up the tunnel, shown in 120-B1.In order to set up described tunnel, can utilize any appropriate signaling and data-interface such as A-10, A-11 etc.

In case set up the tunnel at the 120-B1 place, Target IP GW 22 obtains about the information of mobile AT 14 and for example safe key of proxy mobile node local agent route key, so as HA 24 can to from mobile AT 14 and Target IP GW 22 swap datas.In different embodiment, Target IP GW22 obtains the mobile AT information that needs from service IP GW 20, and needn't communicate by letter with mobile AT 14 or AAA26.Especially, in order to obtain mobile AT information, Target IP GW 22 sets up with the safety of service IP GW20 and is connected, shown in 120-B2 and 120-B3.In different embodiment, the safety that can use general route and encapsulation (GRE) protocol cipher to set up between service IP GW 20 and the Target IP GW 22 connects.

At 120-B4,120-B5 and 120-B6 place, service IP GW 20 and Target IP GW 22 exchange initial data, Target IP GW obtains mobile AT contextual information and for example safe key of proxy mobile node local agent route key.In case Target IP GW 22 has finished from service IP GW 20 and obtained described mobile AT contextual information and safe key, shown in 120-B7, the new record that between target AN 18 and Target IP GW 22 mobile AT 14 is generated just is shown in 120-B8.

Subsequently, Target IP GW 22 uses the safe key that obtains from service IP GW 20 to send Binding Update (BU) message to HA 24, with Target IP GW 22 and HoA and CoA binding, shown in 124-C1 and 124-C2.In case set up described binding at the 124-C2 place, between Target IP GW22 and HA 24, just set up the tunnel so that can begin via Target IP GW 22 to from mobile AT 14 routing packets, shown in 128 and 132.

In case set up the tunnel between Target IP GW 22 and the HA 24, and beginning route data between Target IP GW 22 and HA 24, source AN 16 abandons the responsibility to mobile AT 14, and similarly, service IP GW 20 notification target IPGW 22, it is discharging the responsibility to mobile AT 14, shown in 136 and 140.

Fig. 3 illustrates according to the IPGW of different embodiment in the wireless network of realizing as use IPv4 agreement 10 to the IPGW interface.As described above, when the user that accesses terminal initiates radio communication, between mobile AT 14 and service IPGW 20, set up mobile IP session, shown in 104.

According to different embodiment,, shown in 108, can comprise the following sequence of operation to HA 24 enrolled for service IPGW 20 and mobile AT 14.At first, mobile AT 14 sends the configuring request (RRQ) of the CoA that comprises mobile AT 14 to service IP GW 20, shown in 108-D1, so that mobile AT 14 can begin to obtain HoA from HA 24.The described configuring request that service IP GW 20 intercepts from mobile AT 14, and to AAA 26 transmission requests, to obtain the acting on behalf of mobile security key, shown in 108-D2.Subsequently, service IP GW 20 continues to transmit described configuring request to HA 24, shown in 108-D3.HA 24 returns configuration response (RRP) to service IP GW 20 then, and shown in 108-D4, described configuration response (RRP) comprises the information of the HA 24 that will communicate by letter with it about service IP GW 20, that is, and and HoA.The configuration response at 108-D4 place is in network 10 internal trigger proxy-mobile IP (PMIP) sessions.Service IP GW 20 continues to transmit described configuration response to mobile AT 14 then, shown in 108-D5.In different embodiment, can utilize client mobile IP (CMIP) to transmit the request and the response at 108-D1 to 108-D4 place.

At the 108-A6 place, create binding at HA 24 places of binding CoA and HoA, finish thus to the mobile AT 14 of HA 25 registrations.In case finish described client registers, service IP GW 20 sends bind request to HA 24, shown in 108-D7.After receiving described bind request, HA 24 sends request to obtain safe key to AAA 26.HA 24 receives the safe key at 108-D8 place, and sends the binding response at the 108-D7 place to service IP GW 20, finishes the 24 enrolled for service IPGW 20 to HA thus.Thereby, set up the proxy link between service IP GW 20 and the HA 24, and created binding with the CoA of mobile AT 14 and the HA place of HoA, shown in 108-D9 at binding service IP GW 20.

As described above, at 112 and 114 places, mobile AT 14 moves (stop to communicate by letter with source AN 16, begin to communicate by letter with the target AN 18 that is connected to Target IP GW 22).Therefore, the data route that the data between switching HA 24 and the service IPGW 20 are routed between HA 24 and the Target IP GW 22 necessitates.According to different embodiment, shift mobile AT contextual information from service IP GW 20 to Target IP GW 22, shown in 120, can comprise the following sequence of operation.At first, between target AN 18 and Target IP GW 22, set up the tunnel, shown in 120-E1.In order to set up described tunnel, can utilize any appropriate signaling and data-interface such as A-10, A-11 etc.

In case set up described tunnel at the 120-E1 place, Target IP GW 22 need obtain about the information of mobile AT14 and for example safe key of proxy mobile node local agent route key, so as HA 24 can to from mobile AT 14 and Target IP GW 22 swap datas.In different embodiment, Target IP GW 22 obtains mobile AT information from service IP GW 20, and needn't communicate by letter with mobile AT 14 or AAA 26.Especially, in order to obtain mobile AT information, Target IP GW 22 sets up with the safety of service IP GW 20 and is connected, shown in 120-E2 and 120-E3.In different embodiment, the safety that can use general route and encapsulation (GRE) protocol cipher to set up between service IP GW 20 and the Target IP GW 22 connects.

At 120-E4,120-E5 and 120-E6 place, service IP GW 20 and Target IP GW 22 exchange initial data, Target IP GW obtains mobile AT contextual information and for example safe key of proxy mobile node local agent route key.In case Target IP GW 22 has finished from service IP GW 20 and obtained mobile AT contextual information and safe key, shown in 120-E7, between target AN 18 and Target IP GW 22, mobile AT 14 is generated new record, shown in 120-E8.

Subsequently, Target IP GW 22 uses the safe key that obtains from service IP GW 20 to send bind request to HA 24, and HA 24 returns the binding response and comes bound targets IPGW 22 and HoA and CoA, shown in 124-F1,124-F2 and 124-F3.In case set up binding at the 124-F3 place, between Target IP GW 22 and HA 24, just set up the tunnel so that can begin via Target IP GW 22 to from mobile AT 14 routing packets, shown in 128 and 132.

In case set up the tunnel between Target IP GW 22 and the HA 24, and begun route data betwixt, source AN 16 abandons the responsibility to mobile AT 14, and similarly, service IP GW 20 notification target IPGW 22, it is discharging the responsibility to mobile AT 14, shown in 136 and 140.

Fig. 4 illustrate according to different embodiment as use IPGW in the wireless network 10 that the IPv4 agreement realizes to the IPGW interface, wherein, delay has taken place.In different embodiment, the tunnel between mobile AT14 and the HA 24 can expire, or overtime, unless set up new registration procedure between mobile AT 14 and HA 24.Fig. 4 illustrates the operation of network 10 in this case, wherein, is between service and

Target IP GW

20 and 22 before exchange mobile AT context and the safe key 120, and the tunnel expires and is required and sets up new registration procedure, shown in 144 and 148.In this case, context is installed and to be delayed, and be sure of until service IP GW 20 that client is set up new registration procedure and finishes.Just, context is installed and is delayed, and receives until service IP GW 20 and sets up new registration procedure response, shown in 152 and 156.Yet, if begun between service and Target IP

GW

20 and 22, to exchange after mobile AT context and the safe key, receiving at service IP GW 20 and set up new registration procedure the request (not shown), service IP GW 20 will refuse described setting up new registration procedure.

Fig. 5 illustrates the exemplary packet header that will realize in the operation of IPGW interface at the IPGW of network 10 (shown in Fig. 1) according to different embodiments of the invention.Especially, exemplary packet header shown in Figure 5 is applicable to stream of packets or the route that explanation takes place between communication node (CN) (not shown) and mobile AT 14 in Fig. 2.On forward link (FL), the grouping that sends from CN has the source address and the destination address that is set as HoA of the address (CNA) that is set as CN.HA 24 intercepting these groupings (HoA " is owned " by HA) increase external header and transmit grouping to mobile AT 14.The source address of described external header is set as HA address (HAA), and destination address is set as the address of service IP GW 20, for example, and PDSN1.Set up this binding by agent registration.Receive the grouping that has suitable header in order to ensure mobile AT 14, HA 24 adds the route header option, and described route header option comprises CoA.Described original packet is kept intact.After receiving this grouping, service IP GW 20 upgrades described external header, and for example, the destination address that described external header is set is the address (CoA) of route header option, and transmits described grouping to mobile AT 14.Similarly, after switching, after receiving grouping from CN, HA 24 will transmit the grouping that receives to the Target IP GW 24 of for example PDSN2, keep described route header option constant (CoA).According to RFC 3775, packet header is filled on the reverse link (RL).

Description herein only is exemplary in essence, and thereby, the variant that does not deviate from institute's Outline is intended to be in the context of the present invention.This variant is not regarded as deviating from the spirit and scope of content of the present invention.

Claims

1. method that is used for based on network mobile management, described method comprises:

When access terminal when setting up wireless communication sessions between (AT) 14 and first IP gateway (IPGW) 20 moving, to local agent (HA) 24 described mobile AT 14 of registration and described IPGW20; And

When described mobile AT14 when first access network 16 moves to second access network 18, shift about the contextual information of described mobile AT 14 with by what a described IPGW 20 obtained to the 2nd IPGW 22 from a described IPGW 20 and to act on behalf of the mobile security key.

2. method according to claim 1, wherein, be included between described mobile AT 14 and the described HA 24 to the described HA 24 described mobile AT 14 of registration and a described IPGW 20 and connect, and utilize the described mobile security key of acting on behalf of of described mobile AT between a described IPGW20 and described HA 24, to set up proxy link.

3. method according to claim 1, wherein, being included in the described IPGW 20 of binding to the described HA 24 described mobile AT 14 of registration and a described IPGW 20 creates with described HA 24 places of the Care-of Address (CoA) of local address (HoA) that is assigned to described mobile AT 14 and described mobile AT 14 and binds, described HoA is described mobile AT 14, immovable fixed ip address, and described CoA is the temporary ip address of described mobile AT 14, is variable based on the position of described mobile AT 14.

4. method according to claim 3 wherein, generates described CoA by described mobile AT 14 based on the network prefix of an IPGW 20.

5. method according to claim 1, wherein, shift contextual information and obtain described mobile AT 14 contextual informations and the described mobile security key of acting on behalf of from a described IPGW 20 with described agency under the situation that the mobile security key is included in not with described mobile AT 14 or authentication (AAA) server 26 communicate by letter.

6. method according to claim 1, it further comprises:

In case described contextual information and the described mobile security key of acting on behalf of are transferred to described the 2nd IPGW 22, create binding at described the 2nd IPGW 22 of binding with the local address (HoA) of described mobile AT 14 and described HA 24 places of Care-of Address (CoA), flow between described mobile AT 14 and described HA 24 via described the 2nd IPGW 22 to provide the tunnel to be used for packet.

7. method according to claim 1 wherein, comprises to described HA 24 described mobile AT 14 of registration and a described IPGW 20:

When between a described mobile AT 14 and a described IPGW 20, initiating described wireless communication sessions, utilize the mobility home agent route key of acting on behalf of that obtains by a described IPGW 20 between a described IPGW 20 and described HA 24, to set up proxy link; And

The same agent mobility home agent route key that is used to set up described proxy link by use is set up link between described HA 24 and described mobile AT 14, to the described mobile AT 14 of described HA 24 registrations.

8. method according to claim 7, wherein, shift described contextual information and the described mobile security key of acting on behalf of comprises:

When described mobile AT 14 changes into from communicating by letter with described first access network 16 when communicating by letter with described second access network 18, the described contextual information and the described mobility home agent route key of acting on behalf of that shift about described mobile AT 14 to described the 2nd IPGW 22 from a described IPGW 20; And

Utilization is set up link from described contextual information and the described mobility home agent route key of acting on behalf of that a described IPGW 20 obtains between described the 2nd IPGW 22 and described HA 24, flow between described mobile AT 14 and described HA24 via described the 2nd IPGW 22 to provide the tunnel to be used for packet.

9. method according to claim 1, wherein, register described mobile AT 14 and a described IPGW 20 comprises to described HA24:

When between a described mobile AT 14 and a described IPGW 20, initiating described wireless communication sessions constantly, to the described mobile AT 14 of described HA 24 registrations; And

Utilize by a described IPGW 20 and between a described IPGW 20 and described HA 24, set up proxy link, to the described IPGW 20 of described HA 24 registrations from the mobility home agent route key of acting on behalf of that authentication (AAA) 26 obtains.

10. method according to claim 9, wherein, shift described contextual information and the described mobile security key of acting on behalf of comprises:

When described mobile AT 14 switch with described first access network 16 that is linked to a described IPGW 20 communicate by letter with the communicating by letter of described second access network 18 that is linked to described the 2nd IPGW 22 time, from a described IPGW 20 to contextual information and described the act on behalf of mobility home agent route key of described the 2nd IPGW 22 transfers about described mobile AT 14; And

Utilization is set up link from described contextual information and the described mobility home agent route key of acting on behalf of that a described IPGW 20 obtains between described the 2nd IPGW 22 and described HA 24, flow between described mobile AT 14 and described HA 24 via described second access network 18 and described the 2nd IPGW 22 to provide the tunnel to be used for packet.