CN101998566A - Method and device for switching mobile access gateway (MAG) in proxy mobile Internet protocol (PMIP) - Google Patents

Abstract

The embodiment of the invention provides a method and a device for switching a mobile access gateway (MAG) in a proxy mobile Internet protocol (PMIP). The method comprises the following steps of: receiving an MAG switching request which comprises information of the MAG to be switched; judging whether context information of a mobile node (MN) to be switched needs synchronizing with the MAG to be switched or not according to the information of the MAG to be switched, and if so, synchronizing the context information of the MN to be switched with the MAG to be switched; sending a switching registration request to a local mobility anchor (LMA), so that the LMA updates mobile session binding information of the MN to be switched, wherein the switching registration request comprises the information of the MAG to be switched and a context information synchronization instruction of the MN to be switched; receiving a switching registration reply from the LMA, wherein the switching registration reply comprises the context information of the MN to be switched when the context information synchronization instruction indicates that the context information of the MN to be switched is not synchronized with the MAG to be switched; and providing mobility management for the MN to be switched according to the context information of the MN to be switched. The method improves the fault tolerance of the MAG and realizes load balance.

Description

The changing method of Mobile Access Gateway and device in a kind of proxy-mobile IP

Technical field

The present invention relates to the communications field, the changing method and the device of Mobile Access Gateway among particularly a kind of PMIP.

Background technology

The main frame of available technology adopting Traditional IP (Internet Protocol, Internet protocol) technology uses fixed IP addresses to communicate.In communication process, its IP address must remain unchanged, otherwise the communication between the IP main frame will be interrupted.When mobile node (MN, Mobile Node) is mobile between different networks, the IP address will change, and conversation continuity can't guarantee.

For addressing this problem, the Internet engineering duty group (IETF, The Internet Engineering TaskForce) mobile IP (MIP has been proposed, Mobile IP), this is a kind of mobile management technology based on the IP layer, can make mobile node when mobile, keep the IP address constant, thereby guarantee professional continuity.Current MIP has mobile IPv 4 (Internet Protocol Version 4, Internet protocol edition 4) and two versions of mobile IP v 6 (Internet Protocol Version 6, Internet protocol version 6).

Mobile IP technology requires mobile node to support the MIP agreement, does not support MIP but reality is the protocol stack of many terminals.For this reason, ietf definition a kind of based on network mobility management protocol---proxy mobile IPv 6 (PMIPv6, Proxy Mobile IPv6).The PMIPv6 agreement is based on the MIPv6 agreement, and its purpose is to realize to need not that mobile node participates in, based on network IP mobile management.

Fig. 1 is the system configuration schematic diagram of the mobile PMIPv6 of agency of prior art.As shown in Figure 1, the key function entity in the PMIPv6 system comprises local mobile anchor (LMA, Local MobilityAnchor) and Mobile Access Gateway (MAG, Mobile Access Gateway).A PMIPv6 territory (Domain) comprises one or more LMA and a plurality of MAG.The effect of LMA is the equal of the home agent (HA, Home Agent) in the local domain, and MAG is deployed on the couple in router usually, and its effect is that the agency as mobile node registers to LMA.Because the mobility management protocol function of MN is finished by the agency of the MAG in the network, therefore claims that this agreement is proxy-mobile IP (PMIP), the zone that LMA covers is a PMIPv6 territory.

The registration process of PMIPv6 is mainly divided following three steps: at first MAG detects adhering to of mobile node MN, and it is carried out authentication; Authentication process finishes back MAG can initiate the registration process of PMIP; The home network that the back MAG that succeeds in registration begins to simulate mobile node makes it communicate by its home address.

Therefore utilize PMIPv6, network also can provide mobile IP service for the terminal that does not possess the MIP protocol function.

The inventor is in realizing process of the present invention, and find that prior art has the following disadvantages: on behalf of mobile node, MAG register to LMA as first hop router of the accompanying access link of MN; By the bidirectional tunnel with LMA foundation is that mobile node is transmitted data, its Single Point of Faliure will cause losing accessibility by all mobile nodes of this MAG access network, have a strong impact on the experience of user in network, therefore, need the fault tolerant mechanism of a kind of MAG badly in the PMIP technology.

Summary of the invention

The embodiment of the invention provides the changing method and the device of the Mobile Access Gateway among a kind of PMIP.

On the one hand, the embodiment of the invention provides the changing method of Mobile Access Gateway MAG in a kind of proxy-mobile IP, and described changing method comprises: receive the MAG handoff request, comprise the information of to be switched MAG in the described handoff request; Judge whether the contextual information of needs and the synchronous to be switched mobile node MN of described to be switched MAG according to the information of described to be switched MAG, when needing and the described to be switched MAG contextual information of described to be switched MN synchronously; Send the switching register requirement to local mobile anchor LMA, make described local mobile anchor upgrade the mobile binding session information of described to be switched MN, comprise in the described switching register requirement that the information of described to be switched MAG and the contextual information of described to be switched MN indicate synchronously; Receive the switching registration reply from described local mobile anchor, when described contextual information indicate synchronously expression not with described to be switched MAG synchronously during the contextual information of described to be switched MN, comprise the contextual information of described to be switched MN in the described switching registration reply; Contextual information according to described to be switched MN provides mobile management for described to be switched MN.

On the other hand, the embodiment of the invention provides the changing method of Mobile Access Gateway in the another kind of proxy-mobile IP, and described method comprises: the information of obtaining to be switched MAG; Judge whether the contextual information of needs and the synchronous to be switched mobile node MN of to be switched MAG according to the information of described to be switched MAG, when needing and the to be switched MAG contextual information of described to be switched MN synchronously; Send the switching register requirement to local mobile anchor LMA, make described local mobile anchor upgrade the mobile binding session information of described to be switched MN, comprise in the described switching register requirement that the information of described to be switched MAG and the contextual information of described to be switched MN indicate synchronously; Receive from described LMA and to switch registration reply, when described contextual information indicate synchronously expression not with described to be switched MAG synchronously during the contextual information of described to be switched MN, comprise the contextual information of described to be switched MN in the described switching registration reply; Contextual information according to described to be switched MN provides mobile management for described to be switched MN.

Another aspect, the embodiment of the invention provide the changing method of Mobile Access Gateway MAG in another proxy-mobile IP, and described method comprises: the information of obtaining to be switched MAG; Information according to described to be switched MAG sends handoff request to switching target MAG, make described switching target MAG switch registration upgrading the mobile binding session information of to be switched mobile node MN, and then take over described to be switched MAG and provide mobile management for described to be switched MN to local mobile anchor LMA.

Last aspect, the embodiment of the invention also provides the changing method of the Mobile Access Gateway MAG in the another kind of proxy-mobile IP, described method comprises: the MAG management entity obtains the information of to be switched MAG, and send handoff request to switching target MAG according to the information of described to be switched MAG, comprise the information of described to be switched MAG in the described handoff request; Described switching target MAG judges whether the contextual information of needs and the synchronous to be switched mobile node MN of described to be switched MAG according to described handoff request, when needing and the described to be switched MAG contextual information of described to be switched MN synchronously; Described switching target MAG send to switch register requirement to local mobile anchor LMA, comprises in the described switching register requirement that the information of described to be switched MAG and the contextual information of described to be switched MN indicate synchronously; Described LMA upgrades the mobile binding session information of described to be switched MN, and to described switching target MAG transmission switching registration reply, and when described contextual information indicate synchronously the described switching target MAG of expression not with described to be switched MAG synchronously during the contextual information of described to be switched MN, comprise the contextual information of described to be switched MN in the described switching registration reply; Described switching target MAG provides mobile management according to the contextual information of described to be switched MN for described to be switched MN.

Correspondingly, on the one hand, the embodiment of the invention provides a kind of Mobile Access Gateway MAG, and described Mobile Access Gateway comprises: the handoff request receiving element, be used to receive the MAG handoff request, and comprise the information of to be switched MAG in the described handoff request; The handoff request processing unit is used for judging whether according to the information of described to be switched MAG the contextual information of needs and the synchronous to be switched mobile node MN of to be switched MAG, when needing and the described to be switched MAG contextual information of described to be switched MN synchronously; The register requirement transmitting element, be used for sending the switching register requirement to local mobile anchor LMA, make described LMA upgrade the mobile binding session information of described to be switched MN, comprise in the described switching register requirement that the information of described to be switched MAG and the contextual information of described to be switched MN indicate synchronously; The registration reply receiving element, be used for receiving the switching registration reply from described LMA, when described contextual information indicate synchronously expression not with described to be switched MAG synchronously during the contextual information of described to be switched MN, comprise the contextual information of described to be switched MN in the described switching registration reply; Mobility management unit is used for providing mobile management according to the contextual information of described to be switched MN for described to be switched MN.

Correspondingly, on the other hand, the embodiment of the invention provides another kind of Mobile Access Gateway MAG, and described Mobile Access Gateway comprises: the handover information acquiring unit is used to obtain the information of to be switched MAG; The handoff request processing unit is used for judging whether according to the information of described to be switched MAG the contextual information of needs and the synchronous to be switched mobile node MN of to be switched MAG, when needing and the to be switched MAG contextual information of described to be switched MN synchronously; The register requirement transmitting element, be used for sending the switching register requirement to local mobile anchor LMA, make described LMA upgrade the mobile binding session information of described to be switched MN, comprise in the described switching register requirement that the information of described to be switched MAG and the contextual information of described to be switched MN indicate synchronously; The registration reply receiving element, be used for receiving the switching registration reply from described LMA, when described contextual information indicate synchronously expression not with described to be switched MAG synchronously during the contextual information of described to be switched MN, comprise the contextual information of described to be switched MN in the described switching registration reply; Mobility management unit is used for providing mobile management according to the contextual information of described to be switched MN for described to be switched MN.

Correspondingly, another aspect, the embodiment of the invention provide the management entity of the Mobile Access Gateway in a kind of proxy-mobile IP, and described management entity comprises: the handover information acquiring unit is used to obtain the information of to be switched Mobile Access Gateway MAG; Handover management element, be used for sending handoff request to switching target MAG according to the information of described to be switched MAG, make described switching target MAG switch registration upgrading the mobile binding session information of to be switched mobile node MN, and then take over described to be switched MAG and provide mobile management for described to be switched MN to local mobile anchor LMA.

The changing method of Mobile Access Gateway among the PMIP that the embodiment of the invention provides, at Mobile Access Gateway generation catastrophic failure, maintenance upgrade, load is situation such as unreachable too much or between Mobile Access Gateway and the local mobile anchor, and can't provide mobile management when service for subordinate's mobile node, this Mobile Access Gateway subordinate's all or part of mobile node can be switched to the Mobile Access Gateway that other could normally move or provide substituting service, thereby improved the fault-tolerant ability of network, the method for the embodiment of the invention has also realized the load balancing between the MAG simultaneously.

Description of drawings

Fig. 1 is the system configuration schematic diagram of the mobile PMIPv6 of agency of prior art;

Fig. 2 is the system deployment schematic diagram of MAG reliability solution among the mobile PMIPv6 of the agency of the embodiment of the invention;

Fig. 3 carries out the whole Signalling exchange flow chart of MAG changing method for the system of the embodiment of the invention;

Fig. 4 carries out the whole Signalling exchange flow chart that MAG switches for the system of the embodiment of the invention 1;

Fig. 5 carries out the whole Signalling exchange flow chart that MAG switches for the embodiment of the invention 2 systems;

Fig. 6 carries out the whole Signalling exchange flow chart that MAG switches for the system of the embodiment of the invention 3;

Fig. 7 carries out the whole Signalling exchange flow chart that MAG switches for the system of the embodiment of the invention 4;

Fig. 8 is the functional block diagram of a kind of MAG management entity of the embodiment of the invention 5;

Fig. 9 is the changing method schematic flow sheet of Mobile Access Gateway among a kind of PMIP of the embodiment of the invention 6;

Figure 10 is the schematic flow sheet of the changing method of Mobile Access Gateway among a kind of PMIP of the embodiment of the invention 7;

Figure 11 is the schematic flow sheet of the changing method of Mobile Access Gateway among a kind of PMIP of the embodiment of the invention 8;

Figure 12 is the schematic flow sheet of Mobile Access Gateway changing method among a kind of PMIP of the embodiment of the invention 9;

Figure 13 is the functional block diagram of a kind of Mobile Access Gateway of the embodiment of the invention 10;

Figure 14 is the functional block diagram of a kind of Mobile Access Gateway of the embodiment of the invention 11;

Figure 15 is the functional block diagram of a kind of local mobile anchor of the embodiment of the invention 12.

Embodiment

In order to make the clear more and easy to understand of the object of the invention, feature, advantage, the specific embodiment of the present invention is done detailed explanation and elaboration below with reference to accompanying drawing.

Fig. 2 is the system deployment schematic diagram of MAG reliability solution among the mobile PMIPv6 of the agency of the embodiment of the invention.The embodiment of the invention provides Mobile Access Gateway management entity among a kind of PMIP.The embodiment of the invention realizes fault-tolerant management and the load balancing (Load balance) of MAG by introducing MAG pond (MAG Pool, Mobile Access Gateway Pool) notion.

The MAG pond is the set of the MAG of alternative service mutually, is notion in logic.Promptly when certain MAG can't continue as some MN mobility service is provided, then one or more other MAG in the MAG pond can replace this MAG to provide mobility service to corresponding mobile node.

For the MAG in the MAG pond is carried out failure detection and centralized management, the embodiment of the invention provides Mobile Access Gateway management entity among a kind of PMIP: MAG pond management entity (MPM, MAG PoolManagement entity).MPM detects accessibility, fault or the load information of each MAG in the same MAG pond by heartbeat message.The major function of MPM comprises: state and the load information of safeguarding MAG in the MAG pond; Be responsible for the MAG in the MAG pond is carried out failure detection; When certain MAG in the pond lost efficacy or satisfied switching condition, MPM selected T-MAG (Takeover Mobile AccessGateway, switching target MAG) and starts the MAG handover mechanism; Carrying out target entity when mobile node inserts MAG selects.

Fig. 3 carries out the Signalling exchange flow chart of MAG changing method for the system of the embodiment of the invention.As shown in Figure 3, MAG changing method by the embodiment of the invention, T-MAG all replaces or part replaces P-MAG (Previous Mobile Access Gateway, the preceding MAG of to be switched or switching) to carry out the mobile management service, thereby realizes the fault-tolerant and load balancing between the MAG.MAG changing method shown in Figure 3 has been described between the MPM of the embodiment of the invention, to be switched MAG, switching target MAG and the LMA and has been carried out Signalling exchange, with the course of work that realizes that MAG switches.The flow process of the changing method of the embodiment of the invention comprises the steps:

Step S301, MPM obtain P-MAG information;

Described P-MAG information comprises the P-MAG sign, the state of P-MAG, and this information can also comprise the LMA sign of to be switched MN sign, to be switched MN etc.; FQDN (Fully Qualified Domain Name, the universe name) sign that described P-MAG sign can be IP address, P-MAG or other can uniquely be represented the sign of P-MAG; The state of described P-MAG is meant that P-MAG fault, P-MAG load are excessive, state such as unreachable between P-MAG and the LMA; The network access Identifier (NAI, Network Access Identifier) that described to be switched MN sign can be the user etc.; The LMA of described to be switched MN sign is used to be expressed as the LMA that to be switched MN provides the mobile management service, and it can be the sign that the FQDN sign of IP address, LMA of LMA or other can unique LMA of representative; Described MPM can obtain P-MAG information by the modes such as indication message that heartbeat mechanism between MPM and the P-MAG or P-MAG send.

Step S302, MPM send the MAG handoff request to T-MAG; Carry P-MAG information in the request, and indicate the contextual information that whether needs from the synchronous MN of P-MAG;

The contextual information of described MN is meant the relevant information of the mobile management of MN, and it can comprise the information such as network prefix (MN-HNP, MN home network prefix), MN sign (MN-ID) and interface ID of MN; The synchronous indication of described contextual information can need indicate whether the contextual information of synchronous MN by switch reasons to T-MAG, when for example switch reasons is the P-MAG fault, T-MAG needn't with the contextual information of the synchronous to be switched MN of P-MAG, when switch reasons is P-MAG when overload, T-MAG can with the contextual information of the synchronous to be switched MN of P-MAG; The synchronous indication of contextual information also can dominance be represented in addition, promptly directly increases a sign.

If the handoff request message that step S303 T-MAG sends according to MPM, judge the contextual information that needs with the synchronous to be switched MN of P-MAG, the contextual information of the synchronous to be switched MN of T-MAG then, when when not required, then T-MAG not with the contextual information of the synchronous to be switched MN of P-MAG;

Step S304, T-MAG initiate to switch register requirement to LMA;

If contain the LMA sign in the P-MAG information that T-MAG receives, then send and switch register requirement to the corresponding LMA of this LMA sign; If T-MAG can't directly communicate by letter with this LMA (for example this LMA and T-MAG be not in same PMIP territory), then T-MAG (for example is the border LMA in a PMIP territory to default LMA, the sign of default LMA is configurable on T-MAG) send and switch register requirement, switch register requirement to transmit to the corresponding LMA of above-mentioned LMA sign by this default LMA; If T-MAG does not receive the LMA sign, then all LMA send the switching register requirement in the PMIPv6 territory; The sign of carrying P-MAG in the described switching register requirement; Described switching register requirement also will be carried and whether carried out contextual information and indicate synchronously, promptly indicates the whether synchronous contextual information of to be switched MN between P-MAG and the T-MAG; Described switching register requirement can also be carried to be switched information such as MN sign;

Step S305, LMA upgrade the mobile binding session information of to be switched MN;

The mobile binding session information that described LMA upgrades to be switched MN is meant that LMA upgrades the routed path of to be switched MN, and the PCoA (Proxy Care-of-Address acts on behalf of Care-of Address) that is about to be switched MN is updated to the address of T-MAG from the address of P-MAG; Described to be switched MN can obtain according to the identification information that switches the to be switched MN in the register requirement, and when the switching register requirement did not contain the identification information of to be switched MN, to be switched MN was meant all MN that mobility service is provided by P-MAG.

Step S306, LMA send to T-MAG and switch registration reply, and registering result is switched in indication;

Indicating between expression P-MAG and the T-MAG not contextual information to MN synchronously when the contextual information in the switching register requirement that LMA receives carries out switching the contextual information that need carry to be switched MN in the registration reply when synchronous.

Step S307, T-MAG provide mobility service to be switched MN;

Described T-MAG provides mobility service to be meant that T-MAG is that to be switched MN creates route to be switched MN, send route announcement message, declare the home network prefix of to be switched MN, optionally substituting P-MAG transmission life cycle is the zero home network prefix router advertisement that contains to be switched MN, and declaration P-MAG stops to provide route for to be switched MN.

Step S308, T-MAG send the MAG handoff request to MPM and reply; The indication switching result, i.e. success or failure cause.

The changing method of Mobile Access Gateway among the PMIP of the embodiment of the invention, MAG take place catastrophic failure, maintenance upgrade, load too much or and LMA between situation such as unreachable, and can't provide mobile management when service for subordinate MN, this MAG subordinate's all or part of MN can be switched to the MAG that other could normally move or provide substituting service, thereby improved the fault-tolerant ability of network, the MAG changing method of the embodiment of the invention has also been realized the load balancing between the MAG simultaneously.

Embodiment 1:

Present embodiment 1 provides a kind of system of the embodiment of the invention to carry out the method that MAG switches, and this method needs the contextual information of synchronous to be switched MN.The switch reasons of present embodiment comprises P-MAG and LMA is unreachable or the P-MAG overload.In the present embodiment, P-MAG and T-MAG all can be connected directly to LMA, or P-MAG and T-MAG all are in the management domain of this LMA.

Fig. 4 carries out the Signalling exchange flow chart that MAG switches for the system of the embodiment of the invention 1.As shown in Figure 4, the embodiment of the invention 1 system carries out the method that MAG switches and comprises:

Step S401, MPM obtain the information of P-MAG;

For example, MPM is known P-MAG by heartbeat message and LMA is unreachable or the P-MAG overload;

Step S402, MPM send the MAG handoff request to T-MAG; The switch reasons that carries in the request is P-MAG and LMA is unreachable or P-MAG overload; Carry the sign of P-MAG and the sign of LMA in the request;

The contextual information of finishing between step S403, P-MAG and the T-MAG to be switched MN carries out synchronous process;

Step S404, T-MAG initiate to switch register requirement to LMA, indicate the synchronous contextual information of to be switched MN between P-MAG and the T-MAG in the request;

Step S405, LMA upgrade the mobile binding session information of to be switched MN, with the address that Care-of Address is updated to T-MAG of acting on behalf of of to be switched MN;

Step S406, LMA send to T-MAG and switch registration reply, indicate the switching registering result;

Step S407, T-MAG provide mobility service to be switched MN;

Step S408, T-MAG send the MAG handoff request to MPM and reply; The indication switching result, i.e. success or failure cause.

Embodiment 2:

Present embodiment 2 provides a kind of system of the embodiment of the invention to carry out the method that MAG switches, and this changing method does not need the contextual information of synchronous to be switched MN, and this method is applied in the scene of P-MAG inefficacy.In the present embodiment, P-MAG and T-MAG all can be connected directly to LMA, or P-MAG and T-MAG all are in the management domain of this LMA.

Fig. 5 carries out the Signalling exchange flow chart that MAG switches for the embodiment of the invention 2 systems.As shown in Figure 5, this changing method comprises:

Step S501, MPM obtain the information of P-MAG;

For example, MPM is known the information of inefficacy P-MAG by heartbeat message.

Step S502, MPM send the MAG handoff request to T-MAG; Carry the sign of P-MAG in this handoff request, and to indicate switch reasons be that P-MAG lost efficacy, alternatively, carry the sign of LMA;

Step S503, T-MAG initiate to switch register requirement to the corresponding LMA of above-mentioned LMA sign; Carry the sign of P-MAG in the request, and do not have the contextual information of synchronous to be switched MN between indication P-MAG and the T-MAG; If T-MAG does not obtain the sign of LMA, this step T-MAG all LMA in the territory send and switch register requirement;

Step S504, LMA upgrade all mobile binding session information attached to the mobile node of P-MAG, and the update agent Care-of Address is the address of T-MAG;

Step S505, LMA send to T-MAG and switch registration reply, indicate the switching registering result; Carry the contextual information of to be switched MN in replying;

Step S506, T-MAG provide mobility service to be switched MN;

Step S507, T-MAG send the MAG handoff request to MPM and reply, the indication switching result.

Embodiment 3:

The embodiment of the invention 3 provides a kind of system of the embodiment of the invention to carry out the method that MAG switches.The application scenarios of this method is that MPM is positioned at T-MAG, and needs the contextual information of synchronous to be switched MN.In present embodiment 3, T-MAG/MPM all can directly link to each other with LMA with P-MAG, or T-MAG/MPM and P-MAG all are in the management domain of this LMA.Fig. 6 carries out the Signalling exchange flow chart that MAG switches for the system of the embodiment of the invention 3.As shown in Figure 6, the changing method of the embodiment of the invention 3 comprises:

Step S601, T-MAG/MPM are known the P-MAG overload by heartbeat message;

The contextual information of synchronous to be switched MN between step S602, T-MAG/MPM and the P-MAG;

Step S603, T-MAG/MPM indicate the contextual information of synchronous to be switched MN to specifying LMA to initiate to switch register requirement in the request message, and the sign of carrying to be switched MN;

Step S604, LMA upgrade the mobile binding session information of to be switched MN;

Step S605, LMA send to T-MAG and switch registration reply, indicate the switching registering result;

Step S606, T-MAG provide mobility service for to be switched MN.

Embodiment 4:

The system that the embodiment of the invention 4 has been described a kind of embodiment of the invention carries out the method that MAG switches.The application scenarios of this method is: the contextual information that needs synchronous to be switched MN; And P-MAG is in the management domain of P-LMA (Previous LMA, to be switched LMA), is managing MN under the P-MAG by P-LMA; T-MAG is in the management domain of T-LMA (Takeover LMA, switching target LMA), is managing MN under the T-MAG by T-LMA; P-LMA is connected with T-LMA, promptly P-LMA can with the T-LMA direct communication; But T-MAG can't be connected directly to P-LMA, and promptly T-MAG can't directly communicate by letter with P-LMA.

Fig. 7 carries out the Signalling exchange flow chart that MAG switches for the system of the embodiment of the invention 4.As shown in Figure 7, the changing method of the embodiment of the invention 7 comprises:

Step S701, MPM obtain the information of P-MAG by heartbeat message;

For example, MPM knows that by heartbeat message P-MAG lost efficacy.

Step S702, MPM send the MAG handoff request to T-MAG; Carry the sign of P-MAG and P-LMA in the request, and to indicate switch reasons be that P-MAG lost efficacy;

Step S703, T-MAG judgement can't initiate to switch register requirement to P-LMA, and then T-MAG sends to T-LMA and switches register requirement, the sign of carrying P-MAG and P-LMA in the request, and indicate the contextual information that does not have synchronous to be switched MN between P-MAG and the T-MAG;

Step S704, T-LMA initiate the data forwarding request to P-LMA, indicate the P-MAG sign, and indication do not have synchronous context;

Step S705, P-LMA upgrade the mobile binding session information of the relevant to be switched MN of P-MAG, with the address that Care-of Address is updated to T-MAG of acting on behalf of of mobile node;

Step S706, P-LMA send data forwarding to T-LMA and reply, and indicate the result of request, and carry the contextual information of to be switched mobile node;

Step S707, T-LMA send to T-MAG and switch registration reply, indicate the result of request, and carry the contextual information of to be switched mobile node;

Step S708, T-MAG provide mobility service to be switched mobile node;

Step S709, T-MAG send the MAG handoff request to MPM and reply; The indication switching result.

In sum, embodiment of the invention 1-4 provides the changing method of MAG among the multiple PMIP.Because overload, maintenance upgrade, failure and other reasons, this method can realize switching attached to the part or all of mobile node MN on the MAG as MAG, thereby improved the MAG fault-tolerance, realized the MAG load balancing.

Embodiment 5:

The embodiment of the invention 5 provides Mobile Access Gateway management entity among a kind of PMIP, and it is corresponding to the MPM among the aforementioned system embodiment 1-4 (MAG pond management entity, MAG Pool Managemententity).MPM detects accessibility, fault or the load information of each MAG in the same MAG pond by heartbeat message.The major function of MPM comprises: state and the load information of safeguarding MAG in the MAG pond; Be responsible for the MAG in the MAG pond is carried out failure detection; When certain MAG in the pond lost efficacy or satisfied switching condition, MPM selected T-MAG and starts the MAG handover mechanism; Carrying out target entity when mobile node inserts MAG selects.

Fig. 8 is the functional block diagram of a kind of MAG management entity of the embodiment of the invention 5.As shown in Figure 8, a kind of MAG management entity (MPM) 800 of the embodiment of the invention comprises:

Handover information acquiring unit 801 is used to obtain the information of to be switched MAG; The information of described to be switched MAG comprises the sign of to be switched MAG and the state of described to be switched MAG; The sign of described to be switched MAG comprises the sign that IP address, the FQDN sign of to be switched MAG or other can the to be switched MAG of unique representative; The state of described to be switched MAG comprises: state such as unreachable or to be switched MAG fault between to be switched MAG overload, to be switched MAG and the LMA;

Handover management element 802, be used for sending handoff request to switching target MAG according to the information of described to be switched MAG, make described switching target MAG switch registration upgrading the mobile binding session information of to be switched MN, and then take over described to be switched MAG and provide mobile management for described to be switched MN to LMA.

Alternatively, in concrete the application, the MAG management entity can also comprise:

Handoff request is replied receiving element 803, and the handoff request that is used to receive the indication switching result that switching target MAG sends is replied.

Alternatively, in concrete the application, above-mentioned handover information acquiring unit 801 can also be used for obtaining by the heartbeat message that receives to be switched MAG the information of described to be switched MAG; Or obtain the information of described to be switched MAG by receiving switching indication that to be switched MAG sends.

Mobile Access Gateway management entity among a kind of PMIP of the embodiment of the invention 5, by obtaining the information of the to be switched MAG that satisfies switching condition, information according to this to be switched MAG sends handoff request to switching target MAG, provides mobile management so that this switching target MAG takes over this to be switched MAG for to be switched MN.Because the embodiment of the invention has adopted this Mobile Access Gateway management entity, thereby can carry out failure detection, load monitoring and handover management to the MAG in the MAG pond, helps realizing the fault-tolerant management of MAG and the load balancing between each MAG.

Embodiment 6:

The embodiment of the invention 6 provides switching (Handover/Handoff) method of Mobile Access Gateway among a kind of PMIP, this method is the method for work of a kind of Mobile Access Gateway management entity of the embodiment of the invention 5, and this Mobile Access Gateway management entity is corresponding to the MPM among the aforementioned system embodiment 1-4.This method can switch to other MAG with the mobile management service of certain MAG subordinate's all or part of mobile node, and this switches, and transparent and mobile node session keeps continuously to mobile node MN.

Fig. 9 is the changing method schematic flow sheet of Mobile Access Gateway among a kind of PMIP of the embodiment of the invention 6.Specifically comprise:

Step S901, obtain the information of to be switched MAG;

Alternatively, step S901 specifically can comprise: MPM obtains the information of described to be switched MAG by the heartbeat message that receives to be switched MAG; Or MPM obtains the information of described to be switched MAG by the switching indication that receives to be switched MAG transmission.

Step S902, send handoff request to switching target MAG according to the information of described to be switched MAG, make described switching target MAG switch registration upgrading the mobile binding session information of to be switched MN, and then take over described to be switched MAG and provide mobile management for described to be switched MN to LMA.

Alternatively, step S902 specifically can comprise: MPM sends handoff request according to the information of described to be switched MAG to switching target MAG, described handoff request comprise the information of described to be switched MAG and whether with the described to be switched MAG indication of described to be switched MN contextual information synchronously, when the synchronously described to be switched MN contextual information of needs and described to be switched MAG, described switching target MAG is from the described to be switched MAG contextual information of described to be switched MN synchronously; When not needing with the synchronously described to be switched MN contextual information of described to be switched MAG, described switching target MAG obtains the contextual information of described to be switched MN from LMA in described switching registration process; Described switching target MAG switches registration upgrading the mobile binding session information of to be switched MN to LMA, and provides mobile management according to the contextual information of described to be switched MN for described to be switched MN.

Alternatively, in concrete the application, said method can also comprise:

The handoff request of the indication switching result that step S903 (not shown), reception switching target MAG send is replied.

The changing method of MAG among a kind of PMIP that the employing embodiment of the invention 6 provides, MPM detects by the state to each MAG in the MAG pond, and when detecting the MAG that satisfies switching condition or receive the switching indication of to be switched MAG transmission, start handover mechanism, select switching target MAG, and all or part of mobile node that will be attached to this MAG that satisfies switching condition switches to switching target MAG, to realize providing for above-mentioned corresponding mobile node the purpose of mobile management service by switching target MAG, avoid the MAG Single Point of Faliure and made mobile node lose accessibility, thereby influenced user experience.The embodiment of the invention has realized the fault-tolerant and load balancing between the MAG by introducing MPM.

Embodiment 7:

The embodiment of the invention 7 provides the T-MAG among the previous embodiment 1-4 to carry out the method for work of handoff procedure.

Figure 10 is the schematic flow sheet of the changing method of Mobile Access Gateway among a kind of PMIP of the embodiment of the invention 7.As shown in figure 10, this changing method comprises the steps:

Step S1001, receive the MAG handoff request, comprise the information of to be switched MAG (P-MAG) in the described handoff request;

Step S1002, judge whether the contextual information of needs and the synchronous to be switched MN of this to be switched MAG, when needing and the contextual information of synchronous this to be switched MN of described to be switched MAG according to the information of described to be switched MAG;

Alternatively, for different application, step S1001-step S1002 can be step S1001 '-step S1002 ';

Step S1001 ', receive the MAG handoff request, comprise the information of to be switched MAG in the described handoff request, and the information of described to be switched MAG comprises the sign of switch reasons and to be switched MAG; Described switch reasons comprises: to be switched MAG breaks down/lost efficacy, unreachable etc. between to be switched MAG overload or to be switched MAG and the LMA;

Step S1002 ', judge whether the contextual information of needs and the synchronous to be switched MN of to be switched MAG, when needing and the contextual information of the synchronous to be switched MN of described to be switched MAG according to described switch reasons;

Alternatively, for different application, step S1001-step S1002 can be step S1001 "-step S1002 ";

Step S1001 ", receive the MAG handoff request, described handoff request comprises the information of to be switched MAG, whether the information of described to be switched MAG comprises and described to be switched MAG indication of the contextual information of described to be switched MN synchronously and the sign of to be switched MAG; Described indication is specifically as follows: when the state of to be switched MAG or switch reasons be to be switched MAG break down/when losing efficacy, indication needn't with the to be switched MAG contextual information of its to be switched MN synchronously; Between the state of to be switched MAG is for overload or to be switched MAG and LMA during inaccessible state, indication need with the to be switched MAG contextual information of its to be switched MN synchronously;

Step S1002 ", judge whether the contextual information of needs and the synchronous to be switched MN of to be switched MAG according to described indication, when needing and the contextual information of the synchronous to be switched MN of described to be switched MAG;

Alternatively, at above-mentioned steps S1001～S1002, step S1001 '～S1002 ' and step S1001 "～S1002 " in, when comprising the sign of to be switched MN in the information of described to be switched MAG, described to be switched MN is the MN according to the sign appointment of described to be switched MN, and promptly described to be switched MN is that described to be switched MN identifies pairing MN.When also comprising to be switched MAG sign in the described to be switched MAG information, described to be switched MN is all MN under the described to be switched MAG.

Step S1003, send to switch register requirement, make described LMA upgrade the mobile binding session information of described to be switched MN, comprise in the described switching register requirement that the information of to be switched MAG and the contextual information of described to be switched MN indicate synchronously to LMA; The sign that can also comprise alternatively, to be switched MN in the described handoff request; Alternatively, the described mobile binding session information that makes described LMA upgrade described to be switched MN is specially: make act on behalf of the address that Care-of Address from the address of to be switched MAG be updated to switching target MAG of described LMA with to be switched MN.

Alternatively, in the practical application, step S1003 can be step S 1003 ';

Step S1003 ', when comprising the sign of LMA in the described to be switched MAG information, then T-MAG sends to the LMA of the sign correspondence of described LMA and switches register requirement; Or

When not comprising the sign of LMA in the described to be switched MAG information, then T-MAG all LMA in the PMIP territory send and switch register requirement;

Comprise in the described switching register requirement information of to be switched MAG and whether with to be switched MAG synchronous the indication of contextual information of described to be switched MN;

Alternatively, in the practical application, step S1003 ' can also further be refined as step S1003 ";

S1003 ", in described to be switched MAG information, comprise the sign of LMA, and T-MAG be can communicate by letter with described LMA the time, T-MAG sends to described LMA and switches register requirement; Or

The sign that in described to be switched MAG information, comprises LMA, and T-MAG be can not communicate by letter with described LMA the time, and T-MAG sends to default LMA and switches register requirement, and by described default LMA described switching register requirement is forwarded to described LMA; Described default LMA is a default LMA, the border LMA in a PMIP territory for example, and the sign of default LMA can be preconfigured on the switching target MAG; Described switching target MAG and described LMA can't direct communication situation can for: this switching target MAG and this LMA be not in same PMIP territory; Or

If T-MAG is not known the sign of the LMA under the to be switched MN, then all LMA send the switching register requirement in the PMIP territory;

Comprise in the described switching register requirement information of to be switched MAG and whether with to be switched MAG synchronous the indication of contextual information of described to be switched MN;

Step S1004, receive from described LMA and to switch registration reply, when described contextual information is indicated expression synchronously not with the contextual information of the synchronous to be switched MN of to be switched MAG, comprise the contextual information of to be switched MN in the described switching registration reply;

Step S1005, provide mobile management for described to be switched MN according to the contextual information of described to be switched MN; Described switching target MAG provides the mobile management service to be meant that switching target MAG is that to be switched MN creates route to be switched mobile node MN, send route announcement message, declare the home network prefix of to be switched MN, optionally, substituting to be switched MAG transmission life cycle is the zero home network prefix route announcement that contains to be switched MN, declares that to be switched MAG stops to provide route for to be switched MN;

Alternatively, in concrete the application, this changing method can also comprise step 1006 (not shown);

Step S1006, send handoff request to the MAG management entity and reply, switch whether success with indication.

The changing method of MAG among a kind of PMIP of the embodiment of the invention 7, T-MAG is by receiving the handoff request that MPM sends, and according to the information of the to be switched MAG that carries in this handoff request to judge whether needs and the to be switched MAG contextual information of the to be switched MN of its subordinate synchronously, and when above-mentioned judged result when being, with the contextual information of the synchronous to be switched MN of to be switched MAG, otherwise asynchronous.Whether T-MAG the synchronous indication of contextual information also will take place sends to LMA in switching register requirement, if LMA knows that this is designated as not, be T-MAG during not with the contextual information of the synchronous to be switched MN of to be switched MAG, LMA carries the contextual information of to be switched MN in switching registration reply.Like this, T-MAG can obtain the contextual information of to be switched MN to be switched MAG or LMA, thereby the agency can be provided for to be switched MN mobile PMIP service.The MAG changing method of the embodiment of the invention, as MAG because when overload, maintenance upgrade or fault, can will switch to another MAG attached to the part or all of mobile node MN on the MAG, thereby improved the fault-tolerance of MAG, avoided the MAG Single Point of Faliure and made mobile node lose accessibility, thereby influence user experience, also realized the load balancing between the MAG simultaneously.

Embodiment 8:

The embodiment of the invention 8 provides the changing method of Mobile Access Gateway among another PMIP.This changing method carries out the method for work of handoff procedure for switching target MAG, and especially, this switching target MAG inside comprises the MPM among the aforementioned system embodiment 1-4, and corresponding to the T-MAG/MPM among Fig. 6.

Figure 11 is the schematic flow sheet of the changing method of Mobile Access Gateway among a kind of PMIP of the embodiment of the invention 8.As shown in figure 11, this changing method comprises the steps:

Step S1101, obtain the information of to be switched MAG;

Step S1102, judge whether the contextual information of needs and the synchronous to be switched MN of to be switched MAG, when needing and the contextual information of the synchronous to be switched MN of to be switched MAG according to the information of described to be switched MAG;

Step S1103, send to switch register requirement to LMA, make described local mobile anchor upgrade the mobile binding session information of described to be switched MN, comprise in the described switching register requirement that the information of described to be switched MAG and the contextual information of described to be switched MN indicate synchronously; Alternatively, can be included as the sign that to be switched MAG provides the LMA of mobile management in the information of described to be switched MAG; Alternatively, can send register requirement to the LMA that mobile management is provided for to be switched MAG according to the sign of described LMA.

Step S1104, receive from described LMA and to switch registration reply, when described contextual information indicate synchronously expression not with to be switched MAG synchronously during the contextual information of this to be switched MN, comprise the contextual information of this to be switched MN in the described switching registration reply;

Step S1105, provide mobile management for described to be switched MN according to the contextual information of described to be switched MN.

Alternatively, the T-MAG in the embodiment of the invention 8 after receiving the information of to be switched MAG, also can send handoff request to other MAG, provides mobile management so that another MAG replaces this to be switched MAG for to be switched MN.

Alternatively, in the embodiment of the invention 8, also can in a MAG pond, the MAG that a plurality of inside comprise MPM be set, so that when one of them MPM breaks down, carry out substituting handover management by among other a plurality of MPM any one, the collapse that helps like this avoiding the inefficacy of single MPM and cause the handover mechanism in whole M AG pond, thus user experience influenced.

In the embodiment of the invention 8, switching target MAG is inner owing to comprise MPM, so, switching target MAG can obtain the information of to be switched MAG by this MPM, and according to this information startup handover mechanism, come so that will be attached to all or part of MN switching of to be switched MAG, comprise that by this inside the switching target MAG of MPM takes over this to be switched MAG and provides mobile management for to be switched MN.The MAG changing method of the embodiment of the invention 8, as MAG because when overload, maintenance upgrade or fault, can will switch to another MAG attached to the part or all of mobile node MN on the MAG, thereby improved the fault-tolerance of MAG, avoided the MAG Single Point of Faliure and made mobile node lose accessibility, thereby influence user experience, also realized the load balancing between the MAG simultaneously.

Embodiment 9:

The embodiment of the invention 9 also provides the changing method of Mobile Access Gateway among a kind of PMIP, and this changing method is the method for work of LMA in handoff procedure among the aforementioned system embodiment 1-4.

Figure 12 is the schematic flow sheet of Mobile Access Gateway changing method among a kind of PMIP of the embodiment of the invention 9, and as shown in figure 12, described method comprises:

Step S1201, receive to switch register requirement, comprise in the described switching register requirement information of to be switched MAG and switching target MAG whether with to be switched MAG synchronous the indication of contextual information of to be switched MN;

The mobile binding session information of step S1202, the to be switched MN of renewal is with Care-of Address is updated to switching target MAG from the address of to be switched MAG the address of acting on behalf of of described to be switched MN;

Alternatively, if receive the sign of to be switched MN, then upgrade the mobile binding session information of the corresponding to be switched MN of described sign; If do not receive the sign of to be switched MN, then upgrade the mobile binding session information of all MN of described to be switched MAG subordinate.

Step S1203, send to switch registration reply, and, comprise the contextual information of to be switched MN in the described switching registration reply as described switching target MAG during not with the contextual information of the synchronous to be switched MN of to be switched MAG.

Changing method based on Mobile Access Gateway among a kind of PMIP of the embodiment of the invention 9, LMA comes the update agent binding information by the switching register requirement that receives switching target MAG transmission, and in switching register requirement, comprise when switching target MAG does not carry out the synchronous indication of the contextual information of to be switched MN with to be switched MAG, in switching registration reply, return the contextual information of to be switched MN to switching target MAG.Simultaneously, adopt this method, LMA can judge that to be switched MN is that to be switched MAG subordinate's part still is all MN according to switching the sign that whether comprises to be switched MN in the register requirement.To sum up, use the method for the embodiment of the invention, can improve the MAG fault-tolerance and realize the MAG load balancing.

Embodiment 10:

The embodiment of the invention 10 provides a kind of Mobile Access Gateway.Figure 13 is the functional block diagram of a kind of Mobile Access Gateway of the embodiment of the invention 10.As shown in figure 13, a kind of Mobile Access Gateway 1300 of the embodiment of the invention 10 comprises:

Handoff request receiving element 1301 is used to receive the MAG handoff request, comprises the information of to be switched MAG in the described handoff request;

Alternatively, for different application, the information of described to be switched MAG comprises switch reasons;

Whether alternatively, for different application, the information of described to be switched MAG does not comprise switch reasons, but comprises: with the described to be switched MAG indication of described to be switched MN contextual information synchronously;

Handoff request processing unit 1302 is used for judging whether according to the information of described to be switched MAG the contextual information of needs and the synchronous to be switched MN of to be switched MAG, when needing and the contextual information of the synchronous to be switched MN of described to be switched MAG;

Alternatively, for different application, handoff request processing unit 1302 can be used for judging whether according to described switch reasons the contextual information of needs and the synchronous to be switched MN of to be switched MAG, when needing and the contextual information of the synchronous to be switched MN of described to be switched MAG;

Alternatively, for different application, handoff request processing unit 1302 can also be used for judging whether according to the described indication of obtaining the contextual information of needs and the synchronous to be switched MN of to be switched MAG, when needing and the contextual information of the synchronous to be switched MN of described to be switched MAG;

Alternatively, for different application, described handoff request processing unit 1302 comprises that also to be switched MN determines the subelement (not shown), is used for when described to be switched MAG information comprises to be switched MAG sign all MN under the described to be switched MAG being defined as described to be switched MN.

Alternatively, for different application, described handoff request processing unit 1302 comprises that also to be switched MN determines subelement, is used for described to be switched MN being identified pairing MN being defined as to be switched MN when described to be switched MAG information also comprises the sign of to be switched MN.

Register requirement transmitting element 1303, be used for sending the switching register requirement to LMA, make described LMA upgrade the mobile binding session information of described to be switched MN, comprise in the described switching register requirement information of to be switched MAG and whether with to be switched MAG synchronous the indication of contextual information of described to be switched MN;

Alternatively, in concrete the application, described register requirement transmitting element 1303 can specifically be used for identifying pairing LMA to described LMA and sending register requirement when described to be switched MAG information comprises the LMA sign; When not comprising the LMA sign in the described to be switched MAG information, described register requirement transmitting element is used for all LMA transmission switching register requirement in the PMIP territory.

Alternatively, in concrete the application, described switching register requirement transmitting element 1303 if can also specifically be used for knowing the sign of the LMA of to be switched MN, and can communicate by letter with described LMA the time, sends to described LMA and to switch register requirement; If or known the sign of the LMA of to be switched MN, and can not communicate by letter with described LMA the time, send to default LMA and to switch register requirement, and described switching register requirement is forwarded to described LMA by described default LMA.

Registration reply receiving element 1304, be used for receiving the switching registration reply from described LMA, described switching registration reply is used to represent that the mobile binding session that whether completes successfully to be switched MN upgrades, and promptly whether successfully the Care-of Address of acting on behalf of of to be switched MN is upgraded the address of binding switching target MAG; When not with the contextual information of the synchronous to be switched MN of to be switched MAG, comprise the contextual information of to be switched MN in the described switching registration reply;

Mobility management unit 1305 is used for providing mobile management according to the contextual information of described to be switched MN for described to be switched MN.

Alternatively, a kind of Mobile Access Gateway 1300 of the embodiment of the invention can also comprise:

Whether handoff request is replied transmitting element 1306, is used for sending handoff request to MPM and replys, switch successful with indication.

The Mobile Access Gateway of the embodiment of the invention 10, can receive the handoff request that MPM sends, and judge whether and to carry out the contextual information of to be switched mobile node synchronous with to be switched Mobile Access Gateway, when judged result during for needs, carry out contextual information synchronously to obtain the contextual information of to be switched MN with to be switched MAG, and whether synchronous indication sends to LMA in switching register requirement, with box lunch synchronously the time, can receive the contextual information of the to be switched MN of LMA transmission, thereby can provide the agency to move service for to be switched MN.The above-mentioned changing method of the Mobile Access Gateway by the embodiment of the invention can realize to be switched MAG subordinate's all or part mobile node is switched to the MAG of the embodiment of the invention, thereby has realized the fault-tolerant and MAG load balancing of MAG.

Embodiment 11:

The embodiment of the invention 11 also provides a kind of Mobile Access Gateway, this Mobile Access Gateway comprises MAG management entity (MPM), since this Mobile Access Gateway built-in or integrated a kind of MAG management entity of the embodiment of the invention, thereby this Mobile Access Gateway has state, load information that detects other MAG and the function that starts handover mechanism, below will be described in detail its structure or functional character.Figure 14 is the functional block diagram of a kind of Mobile Access Gateway of the embodiment of the invention 11.As shown in figure 14, this Mobile Access Gateway 1400 comprises:

Handover information acquiring unit 1401 is used to obtain the information of to be switched MAG;

Handoff request processing unit 1402 is used for judging whether according to the information of described to be switched MAG the contextual information of needs and the synchronous to be switched MN of to be switched MAG, when needing and the contextual information of the synchronous to be switched MN of to be switched MAG;

Register requirement transmitting element 1403, be used for sending the switching register requirement to LMA, make described LMA upgrade the mobile binding session information of described to be switched MN, comprise in the described switching register requirement that the information of described to be switched MAG and the contextual information of described to be switched MN indicate synchronously;

Registration reply receiving element 1404 is used for receiving from described LMA and switches registration reply, when not with the contextual information of the synchronous to be switched MN of to be switched MAG, comprises the contextual information of to be switched MN in the described switching registration reply;

Mobility management unit 1405 is used for providing mobile management according to described to be switched MN contextual information for described to be switched MN.

Alternatively, described handover information acquiring unit 1401 is used to obtain the information of to be switched MAG, is included as the sign that to be switched MAG provides the LMA of mobile management in the information of described to be switched MAG;

Alternatively, described register requirement transmitting element 1403 is used for sending to described LMA and switches register requirement, whether comprise in the described switching register requirement with to be switched MAG synchronous the indication of contextual information of to be switched MN.

A kind of Mobile Access Gateway of the embodiment of the invention 11, because a kind of MAG management entity that its built-in embodiment of the invention provides, thereby this Mobile Access Gateway can obtain the state of each MAG in the MAG pond by detection or other means, and when receiving the switching indication or detecting the MAG that satisfies handover triggering condition, start trigger mechanism, mobile node is switched to target MAG to be switched MAG, provide mobile management or service for mobile node so that switching target MAG can substitute to be switched MAG.The Mobile Access Gateway of the embodiment of the invention can be realized the fault-tolerant and load balancing of MAG.

Embodiment 12:

The embodiment of the invention 12 provides a kind of local mobile anchor.Figure 15 is the functional block diagram of a kind of local mobile anchor of the embodiment of the invention 12, and as shown in figure 15, this local mobile anchor 1500 comprises:

Switch register requirement receiving element 1501, be used for receiving and switch register requirement, comprise in the described switching register requirement information of to be switched MAG and switching target MAG whether with to be switched MAG synchronous the indication of contextual information of to be switched MN;

Mobile binding session updating block 1502 is used to upgrade the mobile binding session information of to be switched MN, with Care-of Address is updated to switching target MAG from the address of to be switched MAG the address of acting on behalf of of described to be switched MN;

Alternatively, described mobile binding session updating block 1502 if receive the sign of to be switched MN, then upgrades the mobile binding session information of the corresponding to be switched MN of described sign;

If do not receive the sign of to be switched MN, then upgrade the mobile binding session information of all MN of described to be switched MAG subordinate;

Switch registration reply transmitting element 1503, be used for sending and switch registration reply, and, comprise the contextual information of to be switched MN in the described switching registration reply as described switching target MAG during not with the contextual information of the synchronous to be switched MN of to be switched MAG.

The local mobile anchor that the embodiment of the invention 12 provides can judge whether to send the contextual information of to be switched MN according to the indication that whether comprises synchronous to be switched MN contextual information in the received switching register requirement in switching registration reply.By the update agent binding information with the contextual information of to be switched MN is provided for switching target MAG in the case of necessary, thereby make to be switched MN switch to switching target MAG, provide the proxy mobility management service for to be switched MN by this switching target MAG to be switched MAG.Therefore, the local mobile anchor that provides of the embodiment of the invention 12 helps realizing the fault-tolerant and load balancing between the MAG.

Though the present invention discloses as above with preferred embodiment; so it is not in order to limit scope of the present invention; any those skilled in the art; without departing from the spirit and scope of the present invention; when can doing a little change and retouching, so protection scope of the present invention claims before looking attached define and are as the criterion.

Claims (18)

1. the changing method of Mobile Access Gateway MAG in the proxy-mobile IP is characterized in that described changing method comprises:

Receive the MAG handoff request, comprise the information of to be switched MAG in the described handoff request;

Judge whether the contextual information of needs and the synchronous to be switched mobile node MN of described to be switched MAG according to the information of described to be switched MAG, when needing and the described to be switched MAG contextual information of described to be switched MN synchronously;

Send the switching register requirement to local mobile anchor LMA, make described local mobile anchor upgrade the mobile binding session information of described to be switched MN, comprise in the described switching register requirement that the information of described to be switched MAG and the contextual information of described to be switched MN indicate synchronously;

Receive the switching registration reply from described local mobile anchor, when described contextual information indicate synchronously expression not with described to be switched MAG synchronously during the contextual information of described to be switched MN, comprise the contextual information of described to be switched MN in the described switching registration reply;

Contextual information according to described to be switched MN provides mobile management for described to be switched MN.

2. changing method according to claim 1 is characterized in that the information of described to be switched MAG comprises switch reasons;

Correspondingly, the information according to described to be switched MAG judges whether that the contextual information of needs and the synchronous to be switched MN of described to be switched MAG comprises:

Judge whether the contextual information of needs and the synchronous to be switched MN of described to be switched MAG according to described switch reasons.

3. whether changing method according to claim 1 is characterized in that, described handoff request also comprises: with the described to be switched MAG indication of described to be switched MN contextual information synchronously;

Correspondingly, described method also comprises:

Judge whether the contextual information of needs and the synchronous to be switched MN of to be switched MAG according to described indication.

4. method according to claim 1 is characterized in that, also comprises to be switched MAG sign in the described to be switched MAG information;

Correspondingly, described to be switched MN is all MN under the described to be switched MAG.

5. method according to claim 1 is characterized in that, also comprises the sign of to be switched MN in the described to be switched MAG information;

Correspondingly, described to be switched MN is that described to be switched MN identifies pairing MN.

6. method according to claim 1 is characterized in that, the described mobile binding session information that makes described local mobile anchor upgrade described to be switched MN is specially:

Make act on behalf of the address that Care-of Address from the address of to be switched MAG be updated to switching target MAG of described local mobile anchor with to be switched MN.

7. method according to claim 1 is characterized in that, describedly send to switch register requirement to LMA and comprises:

When comprising the sign of LMA in the described to be switched MAG information, send to the LMA of the sign correspondence of described LMA and to switch register requirement; When not comprising the sign of LMA in the described to be switched MAG information, all LMA send and switch register requirement in the proxy-mobile IP territory.

8. method according to claim 7 is characterized in that, when comprising the sign of LMA in the described to be switched MAG information, sends to the LMA of the sign correspondence of described LMA and to switch register requirement and also comprise:

In the time can communicating by letter, send the switching register requirement to described LMA with described LMA;

In the time can not communicating by letter, send the switching register requirement to default LMA, and described switching register requirement is forwarded to described LMA by described default LMA with described LMA.

9. a Mobile Access Gateway MAG is characterized in that, described Mobile Access Gateway comprises:

The handoff request receiving element is used to receive the MAG handoff request, comprises the information of to be switched MAG in the described handoff request;

The handoff request processing unit is used for judging whether according to the information of described to be switched MAG the contextual information of needs and the synchronous to be switched mobile node MN of to be switched MAG, when needing and the described to be switched MAG contextual information of described to be switched MN synchronously;

The register requirement transmitting element, be used for sending the switching register requirement to local mobile anchor LMA, make described LMA upgrade the mobile binding session information of described to be switched MN, comprise in the described switching register requirement that the information of described to be switched MAG and the contextual information of described to be switched MN indicate synchronously;

The registration reply receiving element, be used for receiving the switching registration reply from described LMA, when described contextual information indicate synchronously expression not with described to be switched MAG synchronously during the contextual information of described to be switched MN, comprise the contextual information of described to be switched MN in the described switching registration reply;

Mobility management unit is used for providing mobile management according to the contextual information of described to be switched MN for described to be switched MN.

10. Mobile Access Gateway according to claim 9 is characterized in that, described handoff request processing unit comprises: to be switched MN determines subelement;

When comprising to be switched MAG sign in the described to be switched MAG information, be used for all MN under the described to be switched MAG are defined as described to be switched MN;

When comprising the sign of to be switched MN in the described to be switched MAG information, be used for that described to be switched MN is identified pairing MN and be defined as described to be switched MN.

11. the changing method of Mobile Access Gateway MAG in the proxy-mobile IP is characterized in that described method comprises:

Obtain the information of to be switched MAG;

Judge whether the contextual information of needs and the synchronous to be switched mobile node MN of to be switched MAG according to the information of described to be switched MAG, when needing and the to be switched MAG contextual information of described to be switched MN synchronously;

Send the switching register requirement to local mobile anchor LMA, make described local mobile anchor upgrade the mobile binding session information of described to be switched MN, comprise in the described switching register requirement that the information of described to be switched MAG and the contextual information of described to be switched MN indicate synchronously;

Receive from described LMA and to switch registration reply, when described contextual information indicate synchronously expression not with described to be switched MAG synchronously during the contextual information of described to be switched MN, comprise the contextual information of described to be switched MN in the described switching registration reply;

Contextual information according to described to be switched MN provides mobile management for described to be switched MN.

12. a Mobile Access Gateway MAG is characterized in that, described Mobile Access Gateway comprises:

The handover information acquiring unit is used to obtain the information of to be switched MAG;

The handoff request processing unit is used for judging whether according to the information of described to be switched MAG the contextual information of needs and the synchronous to be switched mobile node MN of to be switched MAG, when needing and the to be switched MAG contextual information of described to be switched MN synchronously;

The register requirement transmitting element, be used for sending the switching register requirement to local mobile anchor LMA, make described LMA upgrade the mobile binding session information of described to be switched MN, comprise in the described switching register requirement that the information of described to be switched MAG and the contextual information of described to be switched MN indicate synchronously;

The registration reply receiving element, be used for receiving the switching registration reply from described LMA, when described contextual information indicate synchronously expression not with described to be switched MAG synchronously during the contextual information of described to be switched MN, comprise the contextual information of described to be switched MN in the described switching registration reply;

Mobility management unit is used for providing mobile management according to the contextual information of described to be switched MN for described to be switched MN.

13. the changing method of Mobile Access Gateway MAG in the proxy-mobile IP is characterized in that described method comprises:

Obtain the information of to be switched MAG;

Information according to described to be switched MAG sends handoff request to switching target MAG, make described switching target MAG switch registration upgrading the mobile binding session information of to be switched mobile node MN, and then take over described to be switched MAG and provide mobile management for described to be switched MN to local mobile anchor LMA.

14. method according to claim 13 is characterized in that, the described information of obtaining to be switched MAG comprises:

Obtain the information of described to be switched MAG by the heartbeat message that receives to be switched MAG; Or

Obtain the information of described to be switched MAG by the switching indication that receives to be switched MAG transmission.

15. the Mobile Access Gateway management entity in the proxy-mobile IP is characterized in that described management entity comprises:

The handover information acquiring unit is used to obtain the information of to be switched Mobile Access Gateway MAG;

Handover management element, be used for sending handoff request to switching target MAG according to the information of described to be switched MAG, make described switching target MAG switch registration upgrading the mobile binding session information of to be switched mobile node MN, and then take over described to be switched MAG and provide mobile management for described to be switched MN to local mobile anchor LMA.

16. management entity according to claim 15 is characterized in that:

Described handover information acquiring unit is used for obtaining by the heartbeat message that receives described to be switched MAG the information of described to be switched MAG; Or obtain the information of described to be switched MAG by receiving switching indication that described to be switched MAG sends.

17. management entity according to claim 15 is characterized in that, described management entity also comprises:

Handoff request is replied receiving element, and the handoff request that is used to receive the indication switching result that switching target MAG sends is replied.

18. the changing method of the Mobile Access Gateway MAG in the proxy-mobile IP is characterized in that described method comprises:

The MAG management entity obtains the information of to be switched MAG, and sends handoff request according to the information of described to be switched MAG to switching target MAG, comprises the information of described to be switched MAG in the described handoff request;

Described switching target MAG judges whether the contextual information of needs and the synchronous to be switched mobile node MN of described to be switched MAG according to described handoff request, when needing and the described to be switched MAG contextual information of described to be switched MN synchronously;

Described switching target MAG send to switch register requirement to local mobile anchor LMA, comprises in the described switching register requirement that the information of described to be switched MAG and the contextual information of described to be switched MN indicate synchronously;

Described LMA upgrades the mobile binding session information of described to be switched MN, and to described switching target MAG transmission switching registration reply, and when described contextual information indicate synchronously the described switching target MAG of expression not with described to be switched MAG synchronously during the contextual information of described to be switched MN, comprise the contextual information of described to be switched MN in the described switching registration reply;

Described switching target MAG provides mobile management according to the contextual information of described to be switched MN for described to be switched MN.

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