CN102892172B - Seamless interface switching method for PMIPv6 (Proxy Mobile Internet Protocol v6) multi-connection mobile nodes - Google Patents
Seamless interface switching method for PMIPv6 (Proxy Mobile Internet Protocol v6) multi-connection mobile nodes Download PDFInfo
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Abstract
The invention relates to a seamless interface switching method for PMIPv6 (Proxy Mobile Internet Protocol v6) multi-connection mobile nodes, belonging to the field of PMIPv6. A mobile node is provided with a plurality of network interfaces which simultaneously access to the same PMIPv6 domain, when one network interface (assumed as IF1) of the mobile node is accessed to an MAG3 (Mobile Access Gateway 3) in the same PMIPv6 from an MAG1, data transmitted on the interface is firstly transmitted onto the MAG connected with other network interfaces of the mobile node, and then transmitted to the non-switching interface of the mobile node; and when an LMA (Lightspeed Memory Architecture) detects that the mobile node is leaving the MAG1, the LMA directly transmits the data flow onto the MAG connected with other network interfaces of the mobile node, thereby realizing seamless data transmission in the interface switching process of the mobile node.
Description
Technical field
The invention belongs to proxy mobile IPv 6 (PMIPv6) field, relate to a kind of proxy mobile IPv 6 multi-link mobile node seamless interfacing changing method.
Background technology
Along with the fast development of linking Internet technology and mobile terminal device, network-termination device is often equipped with multiple network interface, and the network domains that terminal accesses multiple isomery simultaneously becomes possibility.Meanwhile, increasing user wishes can enjoy network insertion service anywhere or anytime, is therefore the inevitable requirement of Future Internet agreement development to ambulant support.Current IETF MIF(Multi-interface) working group is devoted to the standardization of formulating multiplex roles related protocol mechanism.And be the demand meeting user's access network whenever and wherever possible, IETF has set up a series of related work group to promote the standardization of mobile IP technology, as MIP4/MIP6 working group is devoted to the standardization of mobile IPv 4/IPv6 technology respectively, Netext working group is devoted to standardization of network side mobility management protocol PMIPv6 etc.
With mobile IPv 4 protocol class seemingly, mobile IPv 6 protocol adds mobility support on the basis of IPv6 agreement.But Mobile IP needs the support of mobile node itself, need the protocol stack revising mobile node, in actual applications, be difficult to determine whether mobile node supports mobile IP protocol.In order to ensure that client also can enjoy Mobile IP service without the need to any amendment, mobile node in mobile IPv 6 protocol needs mobile management work to be processed to transfer in network by proxy mobile IPv 6, and these work are all transferred to network to process.Client just can be moved freely in a network without the need to any amendment, and node address remains constant, node is to mobile complete unaware.Current proxy mobile IPv 6 agreement as next-generation full-IP mobile network hot technology and by extensive concern.
RFC 5949 " proxy mobile IPv 6 fast handoff technique " has done standardization to proxy mobile IPv 6 mobile node interface switching flow, and this manuscript proposes two kinds of fast handoff technique: reactive fast handoff technique and predictive fast handoff technique.These two kinds of handoff techniques are all the modes setting up bidirectional tunnel between the Mobile Access Gateway (MAG) by connecting before mobile node interface switches and the MAG after switching, by the data cached MAG being forwarded to node and being about to access be detained in mobile node switching process, to realize the seamless transit of data flow.The main distinction of two kinds of handoff techniques is, reactive fast handoff technique is after mobile node is linked into new MAG, then is associated with the MAG before switching; And predictive fast handoff technique obtains the information that mobile node is about to switching before mobile node switches, set up the association between two MAG in advance.
The people such as Haisheng jiang propose the interface handoff technique of multiple interface mobile node fault tolerant " in the proxy mobile IPv 6 network ", this handoff technique make use of multiple interfaces of mobile node characteristic, by other usable interface of mobile node, interface is assisted to switch between MAG, main switching mode is, the data buffer storage of the interface switched is passed again back local mobile anchor (LMA), then by LMA, data flow is redirected on other interface of this mobile node.
Generally speaking, the handoff technique that the people such as RFC 5949 " proxy mobile IPv 6 fast handoff technique " and Haisheng jiang propose has very large lifting relative to the interface handoff technique in RFC5213 in performance, but it has certain deficiency.For kind of the handoff technique of two in RFC 5949, the data transmitted in mobile node interface switching process need at the enterprising row cache of MAG, which increase the requirement of the storage capacity to MAG, when there being multiple mobile node to switch in MAG coverage simultaneously, the phenomenons such as the loss of data caused because MAG storage capacity is inadequate may be caused, simultaneously because data need first buffer memory to forward again, the transmission delay of data also will increase greatly, and this is fatal concerning the application of transport latency sensitive class.Although the multiple interface mobile node interface handoff technique that the support of people's propositions such as Haisheng jiang is fault-tolerant make use of the characteristic of the multiple interface of mobile node to assist the transmission of data in interface switching process, but by the data pack buffer mailing to switching interface is forwarded to LMA, then in the mode being redirected to other interface of mobile node, effectively the two kinds of technology solved in RFC 5949 do not require too high problem to MAG caching capabilities, further, data are first forwarded to LMA, and then the data retransmission mode being forwarded to other interface of mobile node may cause larger delay.
Summary of the invention
In order to overcome the deficiencies in the prior art, the object of the present invention is to provide a kind of proxy mobile IPv 6 multi-link mobile node seamless interfacing changing method, utilize the characteristic of the multiple network interface access network of node, no longer need at MAG place data cached, greatly reduce the requirement to MAG data buffer storage ability, also reduce the transmission delay of data simultaneously.
To achieve these goals, the technical solution used in the present invention is:
A kind of proxy mobile IPv 6 multi-link mobile node seamless interfacing changing method, is characterized in that,
LMA in proxy mobile IPv 6 territory is the home network prefix that each interface assignment of multi-link mobile node is identical; Multi-link mobile node is after the home network prefix obtaining LMA distribution, and obtain global I Pv6 address by configuration, different network interfaces has different IPv6 addresses, and namely mobile node interface configuration adopts the configuration mode of identical network prefix different IP addresses;
MAG is after receiving the access request of mobile node, agent binding update messages is sent to LMA, LMA is after the agent binding update messages obtaining MAG transmission, first check whether the mobile node mark in this message exists, if exist, then the network prefix distributing to this mobile node mark is mail to MAG by agent binding update response message, otherwise, be the network prefix that this peer distribution overall situation is unique;
MAG is after receiving LMA agent binding update response message, if this message comprises MAG option, then MAG obtains the home network prefix distributing to this mobile node, then routing broadcast is sent to this mobile node, and increase the route of leading to this mobile node, namely mail to the interface of specifying all packets of home network prefix all to give request access.
Described MAG option comprises the address of all MAG associated with this mobile node, and MAG sends to the address in MAG option and sets up TUNNEL request message, sets up bidirectional tunnel with it subsequently.
Described LMA supports that multiple interfaces of mobile node drifts dynamic, different business stream can be routed on the MAG that associates with mobile distinct interface.
The present invention utilizes the characteristic of the multiple network interface access network of node in proxy mobile IPv 6 network domains, no longer needs at MAG place data cached, greatly reduces the requirement to MAG data buffer storage ability, also reduces the transmission delay of data simultaneously.
Accompanying drawing explanation
Fig. 1 is the multi-link mobile node deployment scenario of proxy mobile IPv 6.
Fig. 2 is proxy mobile IPv 6 multi-link mobile node seamless interfacing hand off signaling interaction flow.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in further details.
A kind of proxy mobile IPv 6 of the present invention multi-link mobile node seamless interfacing changing method, in proxy mobile IPv 6 network, mobile node utilizes multiple network interface access network simultaneously.As shown in Figure 1, when the mobile node is moving, when its any interface moves to another MAG network coverage from the coverage of a MAG network, this mobile node interface will access new MAG to the deployment scenario of multi-link mobile node again.In handoff procedure, utilize the multiplex roles characteristic of mobile node, the present invention, by other interface of mobile node, by the mode forwarded by other interface in the data being in the interface in handoff procedure, realizes the low delay seamless transit of data flow in handoff procedure.
As shown in Figure 2, in the situation of the multiple network interfaces access network simultaneously of proxy mobile IPv 6 network domains, mobile node, multi-link mobile node seamless interfacing changing method concrete steps are as follows:
Step (1): in proxy mobile IPv 6 network, mobile node has multiple network interface (as Fig. 1), suppose mobile node network interface 1(IF1) access proxy mobile IPv 6 territory by MAG1, and hypothesis bidirectional traffic X(Flow X) transmitted by this interface.
Step (2): mobile node enters the coverage of MAG2, and determine network interface 2(IF2) access proxy mobile IPv 6 territory by MAG2.
After step (3): MAG2 detects the access purpose (by 2 layer signals or receive the routing request signal that mobile node sends) of mobile node, obtained the mark (MN-ID) of mobile node by fetch policy file, and send agent binding update request signal to LMA.
Step (4): LMA receives the agent binding update request message that MAG2 sends, detect this mobile node other network interface access network whether existing, if mobile node has network interface and accesses this PMIPv6 territory, then LMA will distribute original home network prefix to mobile node, otherwise, redistribute home network prefix.After LMA accepts the registration of this interface, it will send agent binding update response message to MAG2, in this message and existing protocol unlike, comprise MAG address option in this message, by this option, LMA by the external address notification of MAG that is connected with other network interface of mobile node to MAG2.
First and between LMA step (5): MAG2 sets up bidirectional tunnel after receiving the agent binding update response message that LMA beams back, and then provides home network prefix by routing broadcast to the IF2 of mobile node.When MAG2 detect in agent binding update response message comprise MAG address option (supposing only to comprise MAG1 address) time, it sends TUNNEL request message to MAG1, this message may comprise the one or more options in agent binding update messages, but must comprise mobile node identification options.
Step (6): when after the TUNNEL request message that MAG1 receiving belt MAG2 sends, first check whether this mobile node has the network interface company of building with it, if MAG1 finds that this mobile node does not have network interface associated, it will send tunnel acknowledgment message to MAG2, notice without this mobile node.Otherwise MAG1 will send tunnel acknowledgment message to MAG2, and set up bidirectional tunnel with MAG2.
Step (7): move to other access network as mobile node IF1 and determine to access proxy mobile IPv 6 territory by other MAG, the upstream data that it will be transmitted originally by decision-making on IF1, being sent by IF2.
Step (8): when MAG1 detects that mobile node IF1 disconnects or detect that mobile node IF1 is about to switch, it is by arranging route, originally the downlink data being directly transmitted to mobile node IF1 is flowed through tunnel transmission to MAG2(due to identical in mobile node each interface home network prefix, and data route is forwarded by the mode of prefix matching in MAG, therefore in MAG2, the data received from MAG1 are all forwarded to mobile node IF2, now Flow X downstream forward-path is LMA->MAG1->MAG2-GreatT.GreaT .GTIF2), then binding update messages is sent to LMA, to nullify associating of this interface and MAG1.
Step (9): LMA receive MAG1 send comprise the agent binding update messages of log-off message after, first decision-making will mail to the data retransmission of mobile node IF1 to MAG2(now by MAG1 originally, Flow X downstream forward-path changes LMA->MAG2->IF2 into by LMA->MAG1->IF1), then send Binding Update response message to MAG1 after nullifying the binding of mobile node IF1, and destroy the bidirectional tunnel for mobile node IF1 foundation between LMA and MAG2.
After step (10): MAG1 receives the agent binding update response message that LMA beams back, send tunnel to MAG2 and cancel request message.
Step (11): MAG2 receives after tunnel that MAG1 sends cancels message, sends tunnel and cancels response message, then destroy the tunnel for mobile node establishment between MAG1 and MAG2 to MAG1.
In sum, the invention provides one in proxy mobile IPv 6 network, realize multi-link mobile node interface handoff technique.Compared with existing several interface handoff technique, because the present invention takes full advantage of the multiplex roles characteristic of mobile node, therefore, in mobile node network interface handoff procedure, it no longer needs at MAG place data cached, this greatly reduces the requirement to MAG caching capabilities, simultaneously owing to reducing the time of data buffer storage, the present invention also greatly strengthen the real-time of transfer of data.
Claims (2)
1. a proxy mobile IPv 6 multi-link mobile node seamless interfacing changing method, is characterized in that,
LMA in proxy mobile IPv 6 territory is the home network prefix that each interface assignment of multi-link mobile node is identical; Multi-link mobile node is after the home network prefix obtaining LMA distribution, and obtain global I Pv6 address by configuration, different network interfaces has different IPv6 addresses, and namely mobile node interface configuration adopts the configuration mode of identical network prefix different IP addresses;
MAG is after receiving the access request of mobile node, agent binding update messages is sent to LMA, LMA is after the agent binding update messages obtaining MAG transmission, first check whether the mobile node mark in this message exists, if exist, then the network prefix distributing to this mobile node mark is mail to MAG by agent binding update response message, otherwise, be the network prefix that this peer distribution overall situation is unique;
MAG is after receiving LMA agent binding update response message, if this message comprises MAG option, then MAG obtains the home network prefix distributing to this mobile node, then routing broadcast is sent to this mobile node, and increase the route of leading to this mobile node, namely mail to the interface of specifying all packets of home network prefix all to give request access;
Described method realizes according to the following steps in proxy mobile IPv 6 territory:
Step (1): in proxy mobile IPv 6 network, mobile node has multiple network interface, suppose that mobile node network interface one IF1 accesses proxy mobile IPv 6 territory by MAG1, and hypothesis bidirectional traffic X Flow X is transmitted by this interface;
Step (2): mobile node enters the coverage of MAG2, and determine network interface two IF2 to access proxy mobile IPv 6 territory by MAG2;
Step (3): MAG2 is by two layer signals or receive after routing request signal that mobile node sends detects the access purpose of mobile node, obtained the mark of mobile node by fetch policy file, and send agent binding update request signal to LMA;
Step (4): LMA receives the agent binding update request message that MAG2 sends, detect this mobile node other network interface access network whether existing, if mobile node has network interface access PMIPv6 territory, then LMA will distribute original home network prefix to mobile node, otherwise, redistribute home network prefix; After LMA accepts the registration of this interface, send agent binding update response message to MAG2, in this message, comprise MAG address option, by this option, LMA by the external address notification of MAG that is connected with other network interface of mobile node to MAG2;
After step (5): MAG2 receives the agent binding update response message that LMA beams back, first and between LMA bidirectional tunnel is set up, then home network prefix is provided by routing broadcast to the IF2 of mobile node, when MAG2 detect in agent binding update response message comprise MAG address option time, it sends TUNNEL request message to MAG1, this message comprises the one or more options in agent binding update messages, but must comprise mobile node identification options;
Step (6): after MAG1 receives the TUNNEL request message of MAG2 transmission, first check whether this mobile node has the network interface company of building with it, if MAG1 finds that this mobile node does not have network interface associated, it will send tunnel acknowledgment message to MAG2, notice without this mobile node, otherwise MAG1 will send tunnel acknowledgment message to MAG2, and set up bidirectional tunnel with MAG2;
Step (7): move to other access network as mobile node network interface one IF1 and determine to access proxy mobile IPv 6 territory by other MAG, the upstream data that mobile node will be transmitted originally by decision-making on IF1, being sent by IF2;
Step (8): when MAG1 detects that mobile node IF1 disconnects or detect that mobile node IF1 is about to switch, it is by arranging route, originally the downlink data being directly transmitted to mobile node IF1 is flowed through tunnel transmission to MAG2, now Flow X downstream forward-path is LMA->MAG1->MAG2-GreatT.GreaT .GTIF2, then binding update messages is sent to LMA, to nullify associating of this interface and MAG1;
Step (9): LMA receive MAG1 send comprise the agent binding update messages of log-off message after, first decision-making will mail to the data retransmission of mobile node IF1 to MAG2 by MAG1 originally, now Flow X downstream forward-path changes LMA->MAG2->IF2 into by LMA->MAG1->IF1, then send Binding Update response message to MAG1 after nullifying the binding of mobile node IF1, and destroy the bidirectional tunnel for mobile node IF1 foundation between LMA and MAG2;
After step (10): MAG1 receives the agent binding update response message that LMA beams back, send tunnel to MAG2 and cancel request message;
Step (11): MAG2 receives after tunnel that MAG1 sends cancels message, sends tunnel and cancels response message, then destroy the tunnel for mobile node establishment between MAG1 and MAG2 to MAG1.
2. proxy mobile IPv 6 multi-link mobile node seamless interfacing changing method according to claim 1, it is characterized in that, described MAG option comprises the address of all MAG associated with this mobile node, MAG sends to the address in MAG option and sets up TUNNEL request message, sets up bidirectional tunnel with it subsequently.
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