CN102664970A - Method for hierarchical mobile IPV6 based on mobile sub-net - Google Patents
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Abstract
The invention relates to the communication field, in particular to a method for hierarchical mobile IPV6 based on a mobile sub-net. The purpose of the method is achieved by: replacing a mobile node (MN) with the mobile sub-net on the basis of hierarchical mobile IPV6 (HMIPv6), regarding a mobile router (MR) in the sub-net as a default gateway of the mobile sub-net, receiving and processing signaling and messages from the internal part and external part of the mobile sub-net, and replacing a node in the sub-net to initiate an updating message when the position of the mobile sub-net changes. The communicating and updating processes disclosed by the invention are divided into two modes, namely a route optimizing mode and a non-route optimizing mode. According to the method disclosed by the invention, the effect of effectively reducing switch delay when a communication node is subjected to overall micromotion is achieved by fully utilizing the advantages that the hierarchical mobile IPV6 can obviously reduce signaling interaction and reduce switch delay in the micromotion and by combining the characteristics of overall motion of a network mobility protocol (NEMO).
Description
Technical field
The present invention relates to the communications field, be specifically related to a kind of method of the layered mobile IPv 6 based on mobile subnetwork.
Background technology
Along with developing rapidly of the communication technology and multiple wireless network; And various portable terminals is universal; The appearance of novel mobile service and application makes people no longer be satisfied with the pattern that is linked into Internet service through fixed terminal or single mobile terminal, and hopes and can one group of fixing or mobile node of networking mutually be gathered; Constitute a metastable moving body, insert the Internet and obtain information and service.
Network mobility (NEMO) working group research is made as a whole mobile management and route Reachability question when the Global Internet scope inner conversion on-position with mobile subnetwork.The network topology relative fixed that mobile network is inner is connected to global the Internet through one or more mobile router (MR).Network mobile is transparent fully to mobile network's internal node, and internal node need not moving of sensing network, need not support locomotive function.IETF has issued the official standard RFC3963 of NEMO.
The NEMO network is as shown in Figure 1, is made up of one or more mobile routers, local stationary nodes (LFN) and local fixed router (LFR).Principle and the MIPv6 of NEMO are similar, and when it moved to field network, MR generated Care-of Address CoA, sent BU to its HA, bound HoA and the CoA of MR, and set up bidirectional tunnel.The data that CN mails to LFN will route to HA, should be the HoA of MR through next jumping of route inquiry, and HA just sends to MR with data with the tunnel, and MR routes to LFN after with its decapsulation.On the opposite direction, all source addresses belong to the data of NEMO network prefix scope all will be delivered to HA through the tunnel by MR, and HA is responsible for its decapsulation is routed to CN.
If mobile subnetwork moves to the far position of network from the local; The binding message that sends during each the switching will pass through the long period and could be received by HA; Can cause switching efficiency low, and layered mobile IPv 6 (HMIPv6 RFC5380) has the effect that reduces Signalling exchange; So can adopt the scheme of HMIPv6 to handle with mobile subnetwork as a MN.
HMIPv6 is a kind of solution that on the basis of MIPv6, reduces mutual signaling.HMIPv6 has introduced this new entity of mobile anchor point (MAP), and simple extension has been carried out in the operation of MN, and the operation of HA and CN is had no influence.According to the difference of scope, with MN mobile be divided into move in the same MAP territory and the MAP territory between move.In MIPv6, introduce layering mobile management model, topmost effect is the execution efficient that improves MIPv6.The HMIPv6 structure is as shown in Figure 2, and two important entities are arranged: mobile anchor point (Mobility Anchor Point, MAP) and couple in router (Access Router, AR).A MAP is managing several AR.MN is linked into the Internet through AR, and obtain thus two address: MAP regional care-of address (RCoA) and AR be connected Care-of Address (LCoA).MAP keeps the binding of RCoA and LCoA, and HA and CN then keep the binding of HoA and RCoA.
In reality, MN moves in being everlasting among a small circle, promptly in the territory of a MAP, moves; At this moment; LCoA changes, but RCoA do not change, and HMIPv6 only need accomplish the Binding Update of RCoA and LCoA among the MAP through LBU message and LBA message mutual; The address binding of HA and CN needn't upgrade, thereby has reduced a large amount of Signalling exchanges.
The present invention replaces MN with mobile subnetwork on the basis of HMIPv6, the characteristics of utilizing the subnet of advantage and NEMO of the minimizing Signalling exchange of layered mobile IPv 6 to move propose a kind of wireless subscriber terminal and move the solution that inserts the Internet.
Summary of the invention
The present invention proposes a kind of method of the layered mobile IPv 6 based on mobile subnetwork, and the present invention is achieved in that
(1) can arrive a mobile network through a MR in order in hierarchical network, to use RFC3963 agreement, the present invention to set signaling and data message, MR promptly is mobile network's a default gateway.MR registers through HA and obtains an accessibility home address, and the mobile network can be connected on the MAP through one or more MR.When MR switched to new MAP territory, for guaranteeing the conversation continuity of all nodes in the network, MR can send LBU message and set up the bidirectional tunnel between MR and the MAP to MAP, thereby can support the mobility of subnet.
(2) mobile subnetwork has a home network address prefix (HNP), and the user in the mobile subnetwork is according to the home address (HNP+) of HNP configuration oneself.
(3) under the non-routing optimality pattern, MAP keeps the binding of RCoA and LCoA, and HA keeps the binding of HoA and RCoA and the binding of HNP and HoA.
(4) under the pattern of routing optimality, MAP keeps the binding of RCoA and LCoA, and HA keeps the binding of HoA and RCoA and the binding of HNP and HoA.CN also will keep the binding of HNP+ and RCoA, and MR keeps the node address HNP+ that communicates with CN in the mobile subnetwork and the binding of RCoA, and keeps the binding of HNP+ and CNA.
(5) communication of non-routing optimality pattern
MN in the mobile subnetwork mails to the data message of CN, and destination address is CNA, and source address is the address (HNP+) of MN; Data message is routed to default gateway MR, and MR encapsulates the data message, the data message after the encapsulation; Structure is as shown in Figure 3, and destination address is HAA, and source address is RCoA.Data message after the encapsulation at first mails to MAP through the tunnel between MR and the MAP, and it is overseas to be directly released into MAP by MAP then.Data message after the encapsulation can be routed to HA according to its destination address.The data message decapsulation of HA to receiving then, mail to CN to the data message after the decapsulation.
CN mails to the data message of the MN of mobile subnetwork, and structure is as shown in Figure 4, and destination address is HNP+, and source address is CNA.Such data message can be routed to the home network of mobile subnetwork, is intercepted and captured by HA.The binding that HA searches HNP and RCoA according to the address prefix HNP of HNP+ encapsulates the data message, and source address is HAA, and destination address is RCoA.MAP intercepted data message, and the binding of searching RCoA and LCoA according to RCoA, thus mail to data message through the tunnel between MAP and the MR default gateway MR of mobile subnetwork.Be discharged in the subnet after the MR decapsulation.
(6) Binding Update of non-routing optimality pattern
When mobile subnetwork moved in the MAP territory, MR was that LCoA changes.Therefore, MR only needs the regulation according to HMIPv6, sends LBU message to MAP.MAP searches the binding of RCoA and LCoA and upgrades binding with new LCoA according to RCoA after receiving LBU message, and then, MAP replys LBA message to MR.
When mobile subnetwork moved to another MAP territory, MR obtained new LCoA and new RCoA.Therefore, MR not only need set up the binding of RCoA and LCoA in new MAP, but also need to upgrade the binding of HoA and RCoA among the HA.For this reason, MR at first sends LBU message to MAP, and message is carried RCoA.MAP receives the binding of setting up RCoA and LCoA after the LBU message, replys LBA message to MR then.After MR receives LBA message, send BU message to HA again, destination address is HAA, and source address is RCoA, and the home address option in the message is inserted HoA.BU message mails to HA through the tunnel between MR and the MAP.HA receives the binding of searching HoA and RCoA according to HoA after the BU message, and upgrades with new RCoA and to bind.Then, HA replys BA message to MR, and destination address is RCoA, the HAA of source address.BA message at first mails to MAP, and MAP is from the BA and the binding of checking and accepting RCoA and LCoA according to RCoA, then through the tunnel between MAP and the MR BA message goes MR.
(7) communication of routing optimality pattern
MN in the mobile subnetwork mails to the data message of CN, and destination address is CNA, and source address is HNP+; After being routed to default gateway MR, MR searches HNP+ according to source address HNP+ and RCoA binds, and the data message header is made amendment; It is as shown in Figure 5 to revise back data message structure; Destination address is CNA, and source address is RCoA, and home address option content is HNP+.Data message mails to MAP through the tunnel between MR and the MAP, and MAP removes encapsulation back release data message to CN.
CN mails to the data message of the MN of mobile subnetwork, and source address is CNA, and destination address is HNP+; CN searches the binding of HNP+ and RCoA according to HNP+ then; The data message is handled, structure is as shown in Figure 6 again, and the source address after the processing is CNA; Destination address is RCoA, and the content in second type of route head is HNP+.After MAP receives data message; Search the binding of RCoA and LCoA according to the destination address RCoA of message; Mail to MR to data message through the tunnel between MAP and the MR then; MR obtains second type of route HNP+ of data message, and changes the destination address of message into HNP+, and the release data message is to corresponding MN.
(8) Binding Update of routing optimality pattern
When mobile subnetwork moved in a MAP territory, the LCoA of MR changed, so MR need send LBU message to MAP, destination address is MAPA, and source address is new LCoA, in message, inserts the position of home address and inserts RCoA.MAP receives the binding of upgrading RCoA and LCoA after the LBU message, and to MR answer LBA message, renewal finishes then.
When MR moved to another MAP territory, MR obtained new LCoA and new RCoA.Therefore, MR not only need set up the binding of RCoA and LCoA in new MAP, but also need to upgrade the binding of HoA and RCoA among the HA, the binding of HNP+ and RCoA among the renewal CN.For this reason, MR at first sends LBU message to MAP, and destination address is MAPA, and source address is LCoA, and message comprises RCoA.MAP receives the binding of setting up RCoA and LCoA after the LBU message, and replys LBA message to MR.Then, MR upgrades the address binding of HA and CN, and key step is following:
● MR sends BU message to HA, and destination address is HAA, and source address is RCoA, and message comprises HoA.BU message mails to HA through the tunnel between MR and the MAP.HA receives after the BU message according to HoA and searches the binding between HoA and the RCoA and upgrade with new RCoA and to bind, and replys BA message to MR then, destination address RCoA, and source address is HAA.MAP receives the binding that BA message is searched RCoA and LCoA according to RCoA, mails to MR to BA message through the tunnel between MAP and the MR then.
● MR sends HoTI and CoTI message to CN after receiving BA message.The destination address of HoTI message is CNA, and source address is HoA.Then, MR encapsulates HoTI message, and the destination address of the HoTI message after the encapsulation is HAA, and source address is RCoA.HoTI message mails to HA through the tunnel between MR and the MAP.HA is to the HoTI message decapsulation after encapsulating, then HoTI message goes CN.The destination address of CoTI message is CNA, and source address is RCoA.CoTI message mails to CN through the tunnel between MR and the MAP.
● after CN receives HoTI message and CoTI message, reply HoT message and CoT message to MR.The destination address of HoT message is HoA, and source address is CNA.The home network of HoT message goes MR is is also intercepted and captured by HA.The binding that HA searches HoA and RCoA according to HoA, then through the tunnel between HA and the MAP HoT message goes MAP.MAP receives the binding of searching RCoA and LCoA according to HoA after the HoT message, then through the tunnel between MAP and the MR HoT message goes MR.The destination address of CoT message is RCoA, and source address is CNA.MAP receives the binding of searching RCoA and LCoA according to RCoA after the CoT message, then through the tunnel between MAP and the MR CoT message goes MR.
● after MR receives HoT message and CoT message, send BU message to CN, destination address is CNA, and source address is RCoA, and message comprises HNP+.BU message mails to CN through the tunnel between MR and the MAP.CN receives the binding of searching HNP+ and RCoA according to HNP+ after the BU message, and upgrades with new RCoA and to bind.Then, CN replys BA message to MR.The destination address RCoA of BA message, source address is CNA.MAP receives the binding of searching RCoA and LCoA according to RCoA after the BA message, and through the tunnel between MAP and the MR BA message goes MR.
During the routing optimality pattern communication, MR is that mobile subnetwork provides when serving, and it must write down the address HNP+ of the MN that communicates with CN in the mobile subnetwork, need replace these MN to initiate to upgrade to CN during renewal, HNP+ among the renewal CN and the binding of HNP.
Description of drawings
The structure chart of Fig. 1 NEMO network;
The structure chart of Fig. 2 HMIPv6;
MN mails to the packet structure figure of CN under the non-routing optimality pattern of Fig. 3;
CN mails to the packet structure figure of MN under the non-routing optimality pattern of Fig. 4;
MN mails to the packet structure figure of CN under Fig. 5 routing optimality pattern;
CN mails to the packet structure figure of MN under Fig. 6 routing optimality pattern;
The practical implementation instance topological diagram of the non-routing optimality schema update of Fig. 7;
The practical implementation instance topological diagram of Fig. 8 routing optimality schema update;
Embodiment
The invention provides a kind of method of the layered mobile IPv 6 based on mobile subnetwork.Its basic thought is: on the basis of HMIPv6, replace MN with mobile subnetwork, the characteristics of utilizing the subnet of layered mobile IPv 6 and NEMO to move reduce Signalling exchange.
Provide an instantiation of the present invention below, and combine Fig. 7 and Fig. 8 to specify embodiment of the present invention.
Address setting is following:
The LCoA:aec0:0:0:1::1/64 of MR in the mobile subnetwork
The HoA:cec0:0:0:1::1/64 of MR in the mobile subnetwork
The RCoA:aec0:0:0:3::1/64 of MR in the mobile subnetwork
The mandate prefix HNP:dec0:0:0:1::0/64 of the mobile subnetwork in the mobile subnetwork
MN address HNP+:dec0:0:0:1::1/64 in the mobile subnetwork
MAPA：bec0:0:0:1::1/64
HAA；cec0:0:0:2::1/64
CNA：dec0:0:0:2::1/64
1, the communication process of non-routing optimality pattern
(1) MN initiates communication
MN in the mobile subnetwork mails to the data message of CN, and structure is as shown in Figure 4, and destination address is dec0:0:0:2::1/64; Source address is dec0:0:0:1::1/64; Data message is routed to default gateway MR, and MR encapsulates the data message, the data message after the encapsulation; Destination address is dec0:0:0:2::1/64, and source address is aec0:0:0:3::1/64.Data message after the encapsulation at first mails to MAP through the tunnel between MR and the MAP, and it is overseas to be directly released into MAP by MAP then.Data message after the encapsulation can be routed to HA according to its destination address.The data message decapsulation of HA to receiving then, mail to CN to the data message after the decapsulation.
(2) CN initiates communication
CN mails to the data message of the MN of mobile subnetwork, and structure is as shown in Figure 5, and destination address is dec0:0:0:1::1/64, and source address is dec0:0:0:2::1/64.Such data message can be routed to the home network of mobile subnetwork, is intercepted and captured by HA.HA searches the binding of aec0:0:0:3::1/64 and dec0:0:0:1::0/64 according to the address prefix dec0:0:0:1::0/64 of dec0:0:0:1::1/64; Thereby the data message is encapsulated; Source address after the encapsulation is cec0:0:0:2::1/64, and destination address is dec0:0:0:1::0/64.MAP intercepted data message, and the binding of searching dec0:0:0:1::0/64 and aec0:0:0:1::1/64 according to dec0:0:0:1::0/64, thus mail to data message through the tunnel between MAP and the MR default gateway MR of mobile subnetwork.
2, the renewal process of non-routing optimality pattern
When mobile subnetwork moves to another MAP territory, as shown in Figure 7.
(1) MR sends LBU message to MAP, and the source address of LBU message is aec0:0:0:1::1/64, and destination address is bec0:0:0:1::2/64, comprises aec0:0:0:3::1/64 in the message.
(2) MAP can remember the binding of aec0:0:0:3::1/64 and aec0:0:0:1::1/64 after receiving LBU message in banding cache, and replys LBA message.After registration is accomplished, between MAP and MR, can form a bidirectional tunnel.
(3) after MR receives the LBA message from MAP, send BU message to HA again.The source address of BU message is aec0:0:0:3::1/64, and destination address is cec0:0:0:2::1/64, and the home address option writes aec0:0:0:3::1/64, and network prefix option writes dec0:0:0:1::0/64, and BU message process of passing through tunnel arrives MAP and mails to HA again.
(4) HA can remember the binding of cec0:0:0:1::1/64 and aec0:0:0:3::1/64 after receiving BU message in banding cache, and remembers the binding of aec0:0:0:3::1/64 and dec0:0:0:1::0/64, replys BA message then.The BA source address is cec0:0:0:2::1/64, and destination address is aec0:0:0:3::1/64.BA message is intercepted and captured by MAP; MAP takes out aec0:0:0:3::1/64 and searches aec0:0:0:1::1/64 and the binding of aec0:0:0:3::1/64 after receiving BA message from the destination address of message; Then mailing to MR after the encapsulation of BA message; The outer source address of message after the encapsulation is bec0:0:0:1::2/64, and destination address is aec0:0:0:1::1/64.
When MR moves in a MAP territory, only need the renewal process in step of (1) in the execution graph 7 and (2) step, the binding of aec0:0:0:1::1/64 and aec0:0:0:3::1/64 gets final product among the renewal MAP.
3, the communication process of routing optimality pattern
(1) MN initiates communication
MN in the mobile subnetwork mails to the data message of CN; Destination address is dec0:0:0:2::1/64, and source address is dec0:0:0:1::1/64, be routed to default gateway MR after; MR searches dec0:0:0:1::1/64 according to source address dec0:0:0:1::1/64 and aec0:0:0:3::1/64 binds; The data message header is made amendment, and it is as shown in Figure 5 to revise back data message structure, and destination address is dec0:0:0:2::1/64; Source address is aec0:0:0:3::1/64, and home address option content is dec0:0:0:1::1/64.Data message mails to MAP through the tunnel between MR and the MAP, and MAP removes encapsulation back release data message to CN.
(2) CN initiates communication
CN mails to the data message of the MN of mobile subnetwork, and source address is dec0:0:0:2::1/64, and destination address is dec0:0:0:1::1/64; CN searches the binding of dec0:0:0:1::1/64 and aec0:0:0:3::1/64 according to dec0:0:0:1::1/64 then; The data message is handled, structure is as shown in Figure 6 again, and the source address after the processing is dec0:0:0:2::1/64; Destination address is aec0:0:0:3::1/64, and the content in second type of route head is dec0:0:0:1::1/64.After MAP receives data message; Search the binding of aec0:0:0:3::1/64 and aec0:0:0:1::1/64 according to the destination address aec0:0:0:3::1/64 of message; Mail to MR to data message through the tunnel between MAP and the MR then; MR obtains second type of route dec0:0:0:1::1/64 of data message, and changes the destination address of message into dec0:0:0:1::1/64, and the release data message is to corresponding MN.
4, the renewal process of routing optimality pattern
When MR moves to a new MAP territory, as shown in Figure 8.
(1) MR sends LBU message to MAP, and the source address of LBU message is aec0:0:0:1::1/64, and destination address is bec0:0:0:1::2/64, comprises aec0:0:0:3::1/64 in the message.
(2) MAP can remember the binding of aec0:0:0:3::1/64 and aec0:0:0:1::1/64 after receiving LBU message in banding cache, and replys LBA message.After registration is accomplished, between MAP and MR, can form a bidirectional tunnel.
(3) after MR receives the LBA message from MAP, send BU message to HA again.The source address of BU message is aec0:0:0:3::1/64, and destination address is cec0:0:0:2::1/64, and the home address option writes aec0:0:0:3::1/64, and network prefix option writes dec0:0:0:1::0/64, and BU message process of passing through tunnel arrives MAP and mails to HA again.
(4) HA can remember the binding of cec0:0:0:1::1/64 and aec0:0:0:3::1/64 after receiving BU message in banding cache, and remembers the binding of aec0:0:0:3::1/64 and dec0:0:0:1::0/64, replys BA message then.The BA source address is cec0:0:0:2::1/64, and destination address is aec0:0:0:3::1/64.BA message is intercepted and captured by MAP, and MAP takes out aec0:0:0:3::1/64 and searches aec0:0:0:1::1/64 and the binding of aec0:0:0:3::1/64 after receiving BA message from the destination address of message, then BA message goes MR.
(5) MR sends HoTI message, and the source address of HoTI message is cec0:0:0:1::1/64, and destination address is dec0:0:0:2::1/64, and the source address after the encapsulation is aec0:0:0:3::1/64, and destination address is cec0:0:0:2::1/64.HoTI message mails to HA after arriving MAP again, and HA carries out decapsulation to HoTI, mails to CN then.
(6) MR sends CoTI message, and the source address of CoTI is aec0:0:0:3::1/64, and destination address is dec0:0:0:2::1/64.CoTI message mails to CN after arriving MAP again.
(7) CN replys HoT message; The source address of HoT is dec0:0:0:2::1/64; Destination address is cec0:0:0:1::1/64; The binding that HoT message is is at first intercepted and captured and searched cec0:0:0:1::1/64 and aec0:0:0:3::1/64 by HA is passed through tunnel between HA and the MAP then HoT message goes MAP, and MAP takes out aec0:0:0:3::1/64 from the destination address of message; And the binding of searching aec0:0:0:3::1/64 and aec0:0:0:1::1/64, pass through the tunnel then HoT message goes MN.
(8) CN replys CoT message, and the source address of CoT message is dec0:0:0:2::1/64, and destination address is aec0:0:0:3::1/64.CoT message is intercepted and captured by MAP, from destination address, takes out aec0:0:0:3::1/64, and searches the binding of aec0:0:0:3::1/64 and aec0:0:0:1::1/64, and MAP mails to MN after encapsulating CoT message then
(9) MR sends BU message to CN, and the source address of BU message is aec0:0:0:3::1/64, and destination address is dec0:0:0:2::1/64, and message comprises dec0:0:0:1::1/64.BU message process of passing through tunnel arrives MAP and mails to CN again.
(10) CN can upgrade the binding information of aec0:0:0:3::1/64 and dec0:0:0:1::1/64 after receiving BU message, and replys BA message, the destination address aec0:0:0:3::1/64 of BA message, and source address is dec0:0:0:2::1/64.MAP takes out aec0:0:0:3::1/64 and searches aec0:0:0:3::1/64 and the binding of aec0:0:0:1::1/64 after receiving BA message from the destination address of message, MAP mails to MR to BA message through the tunnel then.
When MR moves in a MAP territory, only need the renewal process in step of (1) in the execution graph 8 and (2) step, the binding of aec0:0:0:1::1/64 and aec0:0:0:3::1/64 gets final product among the renewal MAP.
Claims (5)
1. method based on the layered mobile IPv 6 of mobile subnetwork is characterized in that:
A, mobile subnetwork promptly also insert the mobile anchor point (MAP) of HMIPv6 as the couple in router of HMIPv6 as the mobile subscriber of layered mobile IPv 6 (HMIPv6) through its mobile router (MR);
B, under the pattern of non-routing optimality, the user in the mobile subnetwork can communicate by letter with Correspondent Node (CN) with home agent (HA) through MAP;
C, under the pattern of routing optimality, the user in the mobile subnetwork can directly communicate by letter with CN through MAP;
The work of D, mobile management is responsible for by MR, MAP and HA, and the user in the mobile subnetwork does not participate in the work of mobile management.
2. the method for a kind of layered mobile IPv 6 based on mobile subnetwork according to claim 1 is characterized in that said steps A specifically comprises:
The MR of A1, mobile subnetwork can obtain a regional care-of address (RCoA) as the mobile subscriber of HMIPv6, is that the data message of destination address can be routed to MAP with RCoA;
The MR of A2, mobile subnetwork can obtain a local Care-of Address (LCoA) as the couple in router of HMIPv6, and HMIPv6 sets up bidirectional tunnel between MAP and MR, and LCoA is the address of bidirectional tunnel MR one side;
A3, MAP set up the address binding of RCoA and LCoA, and through this binding, MAP can utilize RCoA to search LCoA, thereby confirm the bidirectional tunnel of MAP and MR;
A4, mobile subnetwork have a home network address prefix (HNP); User in the mobile subnetwork is according to the home address (HNP+) of HNP configuration oneself; The MR of mobile subnetwork also has a home address (HoA), is that data message or the message of destination address all can be addressed to home network and intercepted and captured by HA with the home address;
A5, HA are that mobile subnetwork is set up the address binding of HNP and HoA and the address binding of HoA and RCoA, and HA can utilize HoA or HNP to search RCoA.
3. the method for a kind of layered mobile IPv 6 based on mobile subnetwork according to claim 1 is characterized in that said step B specifically comprises:
The data message that user in B1, the mobile subnetwork sends, destination address is the address (CNA) of CN, source address is HNP+; MR encapsulates the data message after the encapsulation after receiving the data message that the user sends to the data message; Destination address is the address (HAA) of HA, and source address is RCoA, and the data message after the encapsulation mails to HA through the tunnel between MR and the MAP; After HA receives data message, the data message is carried out decapsulation, mail to CN to the data message of decapsulation then;
B2, CN mail to the user's data message in the mobile subnetwork, and destination address is HNP+, and source address is CNA; Data message is intercepted and captured by HA, and HA searches RCoA according to HNP, then the data message is encapsulated; Data message after the encapsulation, destination address are RCoA, and source address is HAA; After MAP receives data message, search LCoA, mail to MR to data message through the tunnel between MAP and the MR then according to RCoA; After MR received data message, the logarithm message carried out decapsulation, mail to the user to the data message of decapsulation then.
4. the method for a kind of layered mobile IPv 6 based on mobile subnetwork according to claim 1 is characterized in that said step C specifically comprises:
The data message that user in C1, the mobile subnetwork sends; Destination address is CNA, and source address is HNP+, after MR receives the data message that the user sends; Source address HNP+ with RCoA replacement data message; Insert the home address option extension head of data message to HNP+, then, MR mails to CN to data message through the tunnel between MR and the MAP;
C2, CN mail to the user's data message in the mobile subnetwork, and destination address is RCoA, and source address is CNA; Second type of route head of data message inserted HNP+, after MAP receives data message, searches the LCoA of MR according to RCoA; Mail to MR to data message; After MR receives data message, take out the destination address RCoA of HNP+ replacement data message, mail to the user to data message then from second type of route head of data message.
5. the method for a kind of layered mobile IPv 6 based on mobile subnetwork according to claim 1 is characterized in that said step D specifically comprises:
If the D1 mobile subnetwork just moves in the MAP territory, then the LCoA of MR changes, and RCoA does not change, and MR is according to the regulation of HMIPv6, through LBU/LBA message, upgrades the binding of RCoA and LCoA among the MAP;
D2, under the pattern of routing optimality; MR need be each binding to session maintenance HNP+ and CNA; When mobile subnetwork takes place to switch between the MAP territory, MR need with the mutual HoTI/HoT of CN, CoTI/CoT and BU/BA message, the destination address/source address of these message all is CNA.
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