CN101854664B - Method for optimizing data forwarding in nested mobile network - Google Patents
Method for optimizing data forwarding in nested mobile network Download PDFInfo
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- CN101854664B CN101854664B CN2010102030747A CN201010203074A CN101854664B CN 101854664 B CN101854664 B CN 101854664B CN 2010102030747 A CN2010102030747 A CN 2010102030747A CN 201010203074 A CN201010203074 A CN 201010203074A CN 101854664 B CN101854664 B CN 101854664B
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Abstract
The invention discloses a method for optimizing data forwarding in a nested mobile network. In the method, a nested mobile network address conversion table is introduced and comprises the three fields of a destination mobile router home address, a next-level mobile router address and a life cycle. As the mobile routers of each level establish the nested mobile network address conversion table layer by layer and execute the address replacement and forwarding of data packets layer by layer, the upper-level mobile routers can relatively better solve the problem of the frequent tunnel encapsulation and de-encapsulation of the nested mobile network in the data forwarding without knowing network topological information maintained by the next-level mobile routers thereof to further optimize the way of forwarding the data packets in the nested mobile network and simultaneously protect the privacy of the internal topological information of lower-level nested mobile networks. Moreover, the defect that stub networks discard the data packets of the lower-level mobile networks is overcome. The method has the advantages of simple operation steps, easy implementation and vast popularization and application prospect.
Description
Technical field
The present invention relates to a kind of in nested mobile network the optimization method of data forwarding, belong to the technical field of mobile Internet.
Background technology
Network mobility is meant one group of set of the fixing or mobile node of networking mutually, moves as a metastable integral body, and inserts the Internet and obtain information and professional mode.Generally, all these nodes connect and compose a mobile network through router, and it is to be accompanied by the process that router constantly changes Network Access Point that mobile network's integral body moves.The NEMO of the IETF of International Standards Organization (Network Mobility) working group is on the mobile IPv 6 protocol basis; Through the function choosing-item of introducing mobile router MR (Mobile Router), increase mobile router, the content of expanding binding update messages and router advertisement message; And function such as hand-off process flow process, the standard of network enabled mobile management: RFC3963-NEMOv6 (the basic supported protocol of mobile network) has been proposed.
Node M NN (Mobile Network Node) in the outside Correspondent Node CN (Correspondent Node) of mobile network and mobile network is when communicating; The process that its packet is transmitted is: therefore CN-HA-MR-MNN exists the problem of " triangle route ".When not having nested mobile network, can use the scheme that solves " triangle route " in the similar mobile IPv 6 protocol that it is handled.But; When having nested mobile network; Still can there be the problem of similar " triangle route " in the mobile network who is in low layer; Packets need encapsulates and decapsulation through multiple tunnel, and the propagation delay time of packet is increased greatly, and its complexity is far longer than " triangle route " problem in the mobile IPv 6 protocol.
Referring to Fig. 1, the path (shown in dotted line among the figure) when introducing node M N among Correspondent Node and the nested mobile network MNP3 (Mobile Network prefix 3) and communicating: CN-HA3-HA2-HA1-MR1-MR2-MR3-MN.Wherein the home agent of NEMOv6 (Home Agent) HA1, HA2 and HA3 are respectively the home agent of NEMOv6 mobile router MR1, MR2 and MR3.In the packet repeating process, HA3, HA2 and HA1 encapsulate packet successively, then, again by MR1, MR2 and MR3 successively to its decapsulation.Otherwise, when the node from nested mobile network MNP3 sends packet to Correspondent Node, then transmit by the rightabout in above-mentioned path, by mobile router packet is encapsulated, home agent then carries out decapsulation to packet.
At present, prior art solves the encapsulation problem in multiple tunnel through routing optimization manner, and its basic thought is through between top layer mobile router and low layer mobile network's home agent, setting up data forwarding tunnel, reducing the tunnel encapsulation number of plies of packet.But; Routing optimization manner possibly cause low layer mobile network's internal network topology information to be exposed out; And; When middle mobile router refusal is transmitted destination address or source address and is not the address among its mobile network of living in, cause terminal network (stub network) to abandon the defective of low layer packet quilt probably.
For example; One Chinese patent application " a kind of implementation method of mobile network's route and network " (application number: 200810104453.3) propose a kind of routing optimization method that solves nested mobile network; Need lower floor's mobile router to the upper strata mobile router send the own mobile network who safeguards with and the mobile network's of lower floor's mobile router maintenance network topology message; With the mobile network of the lower floor part as the upper strata mobile network, this method has been destroyed the privacy of mobile network's topological structure.
The notion of root mobile router TLMR (Top Layer Mobile Router) is introduced in this patent application; All mobile routers form a tree structure (Tree Struct); Each mobile router is as the node of tree, the mobile router in the tree (except in the tree as the mobile router of leaf node) need know the network topological information that its all descendants's mobile routers are safeguarded.Higher level's mobile router MR4 receives the network topological information of the MR of subordinate transmission and is recorded among the higher level MR, and these network topological informations comprise the information such as home address HoA, Care-of Address CoA, home agent HA and mobile network's prefix MNP of the MR of subordinate and connected all MR of subordinate.Therefore; TLMR knows the topological structure of whole nested networks; MR has also preserved the Care-of Address TLMR_CoA of TLMR simultaneously, and MR sends binding message to the HA of oneself, and this binding message comprises the Care-of Address MR_CoA of MR, the home address MR_HoA of MR and the Care-of Address of TLMR.When the home agent of MR is received these packets, in buffer memory, preserve these binding informations.After accomplishing binding, on behalf of MR and MR_HA, TLMR set up tunnel (referring to shown in Figure 1).MR1 (being above-mentioned mobile router TLMR) has preserved the mobile network's that MR2 and MR3 safeguard network topological information (comprising home address MR2_HoA, Care-of Address MR2_CoA, hometown-agent-address HA2, the mobile network's prefix MNP2 of MR2, home address MR3_HoA, Care-of Address MR3_CoA, hometown-agent-address HA3 and the mobile network's prefix MNP3 of MR3).Also preserved the mobile network's of MR3 maintenance network topological information simultaneously among the MR2.When MR3 sends binding update messages to home agent HA 3, the Care-of Address of root mobile router MR1, the Care-of Address MR3_CoA of oneself and home address MR3_HoA in this message, have been comprised.After HA3 receives this binding update messages, in buffer memory, preserve these binding informations.After accomplishing binding, MR1 replaces MR3 and MR3_HA to set up the tunnel.The binding procedure of MR2 and tunnel establishment procedure are all identical with MR3.
When the node M N of CN in the mobile network MNP3 that MR3 safeguards sent packet, the forward-path of this packet was shown in the solid line among Fig. 1: CN → HA3 → MR1 → MR2 → MR3, and this packet mails to HA3 earlier; Encapsulate by HA3 that (destination address is MR1_CoA; Source address is HA3) after, be transmitted to MR1 through the tunnel, after MR1 receives packet; According to the network topological information of preserving, the destination address that skin is encapsulated changes MR3_CoA into.Middle mobile router MR2 does not handle packet and directly is transmitted to MR3, and decapsulation is transmitted to MN to packet by MR3.When the node M N among the mobile network MNP3 when CN sends packet, the packet forward-path is opposite with above-mentioned path, packet is encapsulated that (source address is MR3_CoA by MR3; Destination address is HA3), and be transmitted to MR2, MR2 does not carry out any processing and directly is transmitted to MR1 packet; MR1 changes the source address of the outer encapsulation of packet into the Care-of Address MR1_CoA of self; And packet is transmitted to HA3, HA3 is transmitted to CN after packet is carried out decapsulation.
There are following two defectives in above-mentioned prior art: at first; Prior art is with the part (referring to shown in Figure 1) of the mobile network of subordinate as the higher level mobile network; Each mobile network of subordinate will inform higher level's mobile router with its network topological information, causes mobile network's inner topology information to be exposed.Moreover the middle mobile router of prior art is not made amendment to packet; But, if the mobile network of middle certain one deck during as terminal network, possibly cause mailing to or be dropped from low layer mobile network's packet.Therefore, how to solve above-mentioned two defectives that prior art exists, just become the focus of scientific and technical personnel's concern in the industry.
Summary of the invention
In view of this; The purpose of this invention is to provide a kind of in nested mobile network the optimization method of data forwarding; This method has proposed the notion and the structure of nested mobile network ATT; And relying on the forwarding that this nested mobile network ATT carries out address replacement and packet, the inner topology information that has solved the mobile network preferably is exposed and terminal network abandons the problem of low layer mobile network data bag.
In order to reach the foregoing invention purpose; The invention provides a kind of in nested mobile network the optimization method of data forwarding; It is characterized in that: introduce the nested mobile network ATT, this table comprises following three fields: purpose mobile router home address, next stage mobile router address and time life cycle; Address replacement and forwarding that mobile routers at different levels are successively set up the nested mobile network ATT and successively carried out packet; Solve the problem that repeatedly tunnel encapsulation and decapsulation and the mobile network inner topology information of nested mobile network in data forwarding is exposed, and solved the defective that terminal network abandons low layer mobile network data bag; Said method comprises the following operations step:
When (A) mobile router newly inserts nested mobile network; Receive the advertising of route message that the upper level mobile router sends; If that this route announcement message shows access is the mobile network, after the then new mobile router that inserts is own co-located care-of address, execution in step (B); Otherwise, send binding update messages to its home agent, its current Care-of Address and home address are bound, upgrade positional information, finish this flow process;
(B) set up the nested mobile network ATT: the new mobile router application that inserts adds this nested mobile network, and middle mobile routers at different levels and root mobile router are respectively it and set up the nested mobile network ATT;
(C) the home agent binding of new access mobile router is upgraded: the new mobile router that inserts sends " binding update messages " to its home agent, upgrades positional information;
(D) the nested mobile network ATT of renewal mobile routers at different levels: at different levels middle mobile router and root mobile router in the nested mobile network upgrade self nested mobile network ATT respectively;
(E) node in the nested mobile network is realized communicating by letter with correspondent node.
The present invention is a kind of optimization method of nested mobile network internal data pass-through mode; This method is the address replacement and forwarding of successively setting up the nested mobile network ATT and successively carrying out packet; Working mechanism to mobile router makes amendment; Make higher level's mobile router need not the network topological information of knowing that its next stage mobile router is safeguarded; Just can solve the repeatedly tunnel encapsulation that nested mobile network exists and the problem of decapsulation preferably in data forwarding, thereby optimize the pass-through mode of packet in nested mobile network, also protect low layer mobile network's inner topology information simultaneously; In addition, in the process of successively replacing and transmitting, solved the problem that terminal network abandons low layer mobile network data bag to the data packet address.Operating procedure of the present invention is simple, realizes having good popularization and application prospect easily.
Description of drawings
Fig. 1 is the application scenarios sketch map of the nested mobile network route implementing method of prior art.
Fig. 2 is the optimization method operating procedure flow chart of data forwarding in the nested mobile network of the present invention.
Fig. 3 is the data packet transmission path sketch map in the nested mobile network routing optimization method of the present invention.
Fig. 4 is a nested mobile network ATT structural representation of the present invention.
Fig. 5 is the field and the key diagram of home address notice message of the present invention and updating message thereof.
Fig. 6 is home address announcement acknowledge message of the present invention and upgrades acknowledge message field and key diagram.
Fig. 7 is that the mobile router in the inventive method adds the flow process sequential chart.
Fig. 8 is the data packet transmission Times leading address replacement process sketch map in the inventive method.
Embodiment
For making the object of the invention, technical scheme and advantage clearer, the present invention is made further detailed description below in conjunction with accompanying drawing and embodiment.
As everyone knows; When first mobile network MNET1 (Mobile Network1) inserts the Internet through a nonlocal couple in router; When second mobile network MNET2 and the 3rd mobile network MNET3 insert the Internet through MNET1 and MNET2 respectively, three layers of nested mobile network have just been formed.Wherein, each mobile network's corresponding mobile router MR can set up two-way forwarding tunnel with the home agent HA of oneself.At this moment, when being in node LFN3 among the MNET3 and communicating by letter, carry out triple tunnel encapsulation, cause repeatedly encapsulation and decapsulation in the data forwarding process to be handled, produce data transfer delay data with communication node CN.
Though prior art has solved the multiple tunnel problem in the nested mobile network, can reduce data packet length and the propagation delay time that reduces packet.But its routing optimality is in the low layer mobile router, the Care-of Address of top layer mobile router and the home address of self to be bound, and sets up that low layer mobile network's home agent and the data forwarding tunnel between the top layer mobile router realize.When the node of Correspondent Node in the low layer mobile network sent packet, this packet was forwarded to low layer mobile network's home agent earlier, after the encapsulation, directly is forwarded to the top layer mobile router.Like this, only need be through can realize the routing optimality of packet once heavy tunnel.But there are following two problems in the prior art of this routing optimality: at first, the low layer mobile network must announce the internal network topology information to high-rise mobile network, has destroyed low layer mobile network's privacy.Moreover terminal network causes low layer mobile network's packet to be dropped.Because of terminal network is the edge network of the Internet.The gateway of terminal network abandons source address from the security consideration meeting and does not belong to the outflow packet of this network and the inflow packet that destination address does not belong to this end network.
The present invention is the optimization method of data forwarding in a kind of nested mobile network; This method is introduced the nested mobile network ATT; This table comprises following tactic three fields: purpose mobile router home address, next stage mobile router address and time life cycle (referring to Fig. 4); Address replacement and forwarding that mobile routers at different levels are successively set up the nested mobile network ATT and successively carried out packet; Thereby change the original working mechanism of mobile router, make nested mobile network in data forwarding, no longer carry out repeatedly the operation of tunnel encapsulation and decapsulation.Subordinate's mobile router only needs the home address HoA to upper level mobile router announcement self and subordinate's mobile router thereof; And the upper level mobile router is after receiving these HoA information, and the Care-of Address of subordinate's mobile router that these home address and its are directly linked to each other is bound.Like this, the upper level mobile router just can not obtain the mobile network's of subordinate inner topology information, has protected mobile network's topology information privacy.Simultaneously, through adopting the address replacement policy to solve the defective that terminal network abandons low layer mobile network data bag.
Referring to Fig. 2 and other each accompanying drawings, introduce the concrete operations step of the inventive method:
When steps A, mobile router newly insert nested mobile network; Receive the advertising of route message that the upper level mobile router sends; If that this route announcement message shows access is the mobile network, after the then new mobile router that inserts is own co-located care-of address, execution in step B; Otherwise, send binding update messages to its home agent, its current Care-of Address and home address are bound, upgrade positional information, finish this flow process.
Step B, set up the nested mobile network ATT: the new mobile router application that inserts adds this nested mobile network, at different levels in the middle of mobile routers and root mobile router be respectively it and set up the nested mobile network ATT.This step B comprises following concrete operations content:
(B1) newly insert mobile router and send " home address notice message " (referring to shown in Figure 5) to its upper level mobile router; Care-of address field (MR_CoA) in this home address notice message comprises the Care-of Address of this new access mobile router, and home address field (MR_HoA) comprises the home address of the mobile router that has write down in home address and the nested mobile network ATT thereof of this new access mobile router.
(B2) after this upper level mobile router receives " the home address notice message " of new access mobile router transmission; The home address of all mobile routers in the home address field in this home address notice message and the Care-of Address in the care-of address field are bound, and be stored in the nested mobile network ATT of oneself; Then, after the address that this upper level mobile router will be somebody's turn to do the care-of address field in " home address notice message " replaces with the Care-of Address of self, transmit new " home address notice message " to its upper level mobile router.
(B3) after mobile router was received " home address notice message " in the middle of all, all operations of execution in step (B2) received " home address notice message " until the root mobile router.Among the present invention; The root mobile router is to be positioned at the nested mobile network top layer, directly to insert the Internet; Obtain the outlet mobile router of service, middle mobile router is new all mobile routers that insert between mobile router and the root mobile router in the nested mobile network.
(B4) after the root mobile router receives " home address notice message "; Home address in the home address field in this home address notice message and the Care-of Address in the care-of address field are bound, and be recorded in the nested mobile network ATT of oneself.
(B5) the root mobile router was to returned " home address announcement acknowledge message " (referring to shown in Figure 6) to the next stage mobile router of its transmission " home address notice message " originally, and this home address announcement acknowledge message comprises the Care-of Address of root mobile router.
(B6) after mobile router receives " home address announcement acknowledge message " in the middle of; The Care-of Address of record root mobile router is simultaneously to returning this " home address announcement acknowledge message " to the next stage mobile router of its transmission " home address notice message " originally.
(B7) after mobile router is received " home address announcement acknowledge message " in the middle of all; All operations of execution in step (B6); After the mobile router of new access receives this " home address announcement acknowledge message ", preserve the Care-of Address of the root mobile router in this home address announcement acknowledge message.
(B8) the new mobile router that inserts judges whether it connects the next stage mobile router; If; Then newly insert mobile router and continue to be somebody's turn to do " home address announcement acknowledge message " to the forwarding of next stage mobile router, the next stage mobile router then continues the operation of execution in step (B7); Otherwise, stop forwarding the unrestrained journey of end step B.
Step C, the home agent of new access mobile router bound upgrade: the new mobile router that inserts sends " binding update messages " to its home agent, upgrades positional information.This step C comprises following concrete operations content:
(C1) newly insert mobile router and send " binding update messages ", current Care-of Address and home address are bound, upgrade positional information to its home agent; And nested networks flag and home address option are set respectively in this " binding update messages ", what the former identified its current access is nested networks; Address among the latter is the home address of this new access mobile router.
(C2) after the upper level mobile router receives this " binding update messages ", the source address in the message is replaced with oneself Care-of Address, transmit " binding update messages " to its upper level mobile router then.
(C3) after mobile router was received " binding update messages " in the middle of all, all the operation of execution in step (C2) received " binding update messages " until the root mobile router.
(C4) after the root mobile router receives " binding update messages ", the source address in this binding update messages is replaced with oneself Care-of Address, send it to the home agent of new access mobile router then.
(C5) after the home agent that newly inserts mobile router receives " binding update messages " from the root mobile router; The Care-of Address of home address that newly inserts mobile router and root mobile router is bound; And return " binding acknowledgement message ", declare to be finished to new access mobile router and newly insert the address binding of mobile router; Comprise second type of route field in this binding acknowledgement message, the address in this second type of route field is the home address of this new access mobile router.
(C6) after the root mobile router receives " binding acknowledgement message "; Address according in second type of route field wherein inquires earlier this address pairing " next stage mobile router address " in this second type of route field in the nested mobile network ATT; Again with the destination address that is somebody's turn to do in " the next stage mobile router address " replacement " binding acknowledgement message "; Then, be somebody's turn to do " binding acknowledgement message " to the next stage mobile router forwarding of correspondence; Simultaneously, the root mobile router is set up the tunnel with the new home agent that inserts mobile router.
(C7) after mobile router receives " binding acknowledgement message " in the middle of, check that whether the address in second type of route field in this binding acknowledgement message is complementary with self home address; If coupling shows that this mobile router is exactly the recipient of this " binding acknowledgement message ", the flow process of end step (C); Otherwise middle mobile router inquires second type of pairing next stage mobile router address, this address in the route field according to the address in this second type of route field in the nested mobile network ATT; Again with the destination address in this next stage mobile router address replacement " binding acknowledgement message "; And to next stage mobile router forwarding this " binding acknowledgement message ".
(C8) after all subordinate's mobile routers were received " binding acknowledgement message ", all operations of execution in step (C7) were until the flow process of end step (C).
Fig. 7 is in above-mentioned three steps of the present invention, the associative operation sequential of each network element in the nested networks.
The nested mobile network ATT of step D, renewal mobile routers at different levels: the nested mobile network ATT that at different levels middle mobile router in the nested mobile network and root mobile router upgrade self respectively.
Time life cycle in the nested mobile network ATT of the present invention (referring to Fig. 4) in certain mobile router entry is 0 o'clock; Show that this moment, this mobile router left this nested mobile network, should delete this mobile router pairing clauses and subclauses in the nested mobile network ATT; Therefore, each mobile router in the nested mobile network all will periodically send " home address updating message " to its upper level mobile router, keeps the life span of oneself.This step D comprises following concrete operations content:
(D1) mobile router finds that time life cycle of oneself soon is at 0 o'clock, sends " home address updating message " (referring to shown in Figure 5) to the upper level mobile router; This home address updating message structure is identical with " home address notice message ", and wherein care-of address field (MR_CoA) comprises the Care-of Address of this mobile router, and home address field (MR_HoA) comprises the home address of this mobile router.
(D2) after this upper level mobile router receives this " home address updating message "; After revising the life span of this mobile router entry in the nested mobile network ATT; Address in the care-of address field in the home address updating message is replaced with self Care-of Address, and transmitting to its upper level mobile router should " home address updating message " again.
(D3) after mobile router was received " home address updating message " in the middle of all, all operations of execution in step D2 received this " home address updating message " until the root mobile router.
(D4) after the root mobile router receives this " home address updating message "; After revising the life span of this mobile router entry in the nested mobile network ATT; To the next stage mobile router transmission " home address renewal acknowledge message " (referring to shown in Figure 6) of its transmission " home address updating message ", this home address upgraded the Care-of Address that comprises the root mobile router in acknowledge message to originally;
(D5) after this next stage mobile router receives " home address renewal acknowledge message ", the Care-of Address of record root mobile router; Simultaneously, this home address is upgraded acknowledge message and send to originally middle mobile router to its transmission " home address updating message ".
(D6) after mobile router was received " home address renewal acknowledge message " in the middle of all, all operations of execution in step (D5) received that until the mobile router of initiating this renewal nested mobile network ATT this home address upgrades acknowledge message.
After the mobile router of (D7) initiating this renewal nested mobile network ATT receives that home address upgrades acknowledge message, preserve the Care-of Address of root mobile router, the flow process of end step (D).
Node in step e, the nested mobile network is realized communicating by letter with correspondent node.Node in the nested mobile network of the present invention realizes having when communicating by letter following two kinds of scenes with correspondent node:
Referring to Fig. 8 (A), introduce first kind of scene: the mobile node MN in transmitting uplink data-nested mobile network is sent data to Correspondent Node CN; Among this communication scenes E1, further comprise the following operations content:
(E11) MN sends packet, and wherein source address is the address of MN, and destination address is the address of CN.
(E12) after MN place mobile network's mobile router receives this packet, it is encapsulated, source address wherein is the Care-of Address of this mobile router, and destination address is the address of its home agent; Simultaneously, mobile router increases the home address option that its numerical value is this mobile router home address in this data packet head; Then, mobile router is transmitted this packet to its upper level mobile router.
(E13) after this upper level mobile router is received this packet, whether comprise the home address option in the inspection packet,, then this source data packet address is replaced with the Care-of Address of oneself, transmit packet to its upper level mobile router again if comprise; Otherwise, show that this packet is that certain mobile node sends among this mobile network, just handles this packet according to step (E12) method.
(E14) after mobile router received this packet in the middle of all, all the operation of execution in step (E13) received this packet until the root mobile router.
(E15) after the root mobile router receives this packet, source address is wherein replaced with oneself Care-of Address, this packet is sent to the home agent of MN place mobile network's mobile router through the tunnel;
(E16) after the home agent of MN place mobile network's mobile router is received this packet, packet carried out decapsulation after, again this packet is transmitted to Correspondent Node CN, the communication process of end step E.
Referring to Fig. 8 (B), introduce second kind of scene: the mobile node of downlink data transmission-Correspondent Node in nested mobile network sends data.Among this communication scenes E2, further comprise the following operations content:
(E21) CN sends packet, and source address wherein is the address of CN, and destination address is the address of mobile node MN; After this packet is forwarded to MN place mobile network's home agent according to conventional route; Home agent encapsulates this packet; Wherein source address is a hometown-agent-address, and destination address is the Care-of Address of root mobile router of the nested mobile network at this mobile network place; This packet also comprises second type of route field, and the address in second type of route field is the home address of MN place mobile network's mobile router; Then, this packet is forwarded to the root mobile router of nested mobile network.
(E22) after mobile router received this packet, whether the inspection earlier wherein address in second type of route field was identical with the home address of this mobile router, if identical, then carries out subsequent step (E23); Otherwise, redirect execution in step (E24).
(E23) identical because of the address in second type of route field in the packet with the home address of this mobile router, show that this mobile router is exactly purpose mobile node place mobile network's a mobile router; This mobile router carries out decapsulation to packet, and in this mobile network, transmits; The purpose mobile node receives this packet, the communication process of end step E;
(E24) this mobile router is according to the address in second type of route field in the packet, in the nested mobile network ATT, inquire this address pairing " next stage mobile router address " in this second type of route field earlier after; Again with should " next stage mobile router address " replacing the destination address in this packet; Then, transmit this packet to the next stage mobile router of correspondence; After this next stage mobile router receives this packet, the operation of execution in step (E22).
The above is merely preferred embodiment of the present invention, and is in order to restriction the present invention, not all within spirit of the present invention and principle, any modification of being made, is equal to replacement, improvement etc., all should be included within the scope that the present invention protects.
Claims (9)
1. the optimization method of a data forwarding in nested mobile network; It is characterized in that: introduce the nested mobile network ATT, this table comprises following three fields: purpose mobile router home address, next stage mobile router address and time life cycle; Address replacement and forwarding that mobile routers at different levels are successively set up the nested mobile network ATT and successively carried out packet; Solve the problem that repeatedly tunnel encapsulation that nested mobile network exists and decapsulation and mobile network's inner topology information are exposed in data forwarding, and solved the defective that terminal network abandons low layer mobile network data bag; Said method comprises the following operations step:
When (A) mobile router newly inserts nested mobile network; Receive the advertising of route message that the upper level mobile router sends; If that this route announcement message shows access is the mobile network, after the then new mobile router that inserts is own co-located care-of address, execution in step (B); Otherwise, send binding update messages to its home agent, its current Care-of Address and home address are bound, upgrade positional information, finish this flow process;
(B) set up the nested mobile network ATT: the new mobile router application that inserts adds this nested mobile network, and middle mobile routers at different levels and root mobile router are respectively it and set up the nested mobile network ATT;
(C) the home agent binding of new access mobile router is upgraded: the new mobile router that inserts sends " binding update messages " to its home agent, upgrades positional information;
(D) the nested mobile network ATT of renewal mobile routers at different levels: the nested mobile network ATT that at different levels middle mobile router in the nested mobile network and root mobile router upgrade self respectively;
(E) node in the nested mobile network is realized communicating by letter with correspondent node.
2. method according to claim 1 is characterized in that: said mobile router is can directly insert the Internet in the nested mobile network, obtains the outlet mobile router of service; Mobile router is new all mobile routers that insert between mobile router and the root mobile router in the nested mobile network in the middle of said.
3. method according to claim 1 is characterized in that, said step (B) further comprises the following operations content:
(B1) newly insert mobile router and send " home address notice message " to its upper level mobile router; Care-of address field (MR_CoA) in this home address notice message comprises the Care-of Address of this new access mobile router, and home address field (MR_HoA) comprises the home address of the mobile router that has write down in home address and the nested mobile network ATT thereof of this new access mobile router;
(B2) after this upper level mobile router receives " the home address notice message " of new access mobile router transmission; The home address of all mobile routers in the home address field in this home address notice message and the Care-of Address in the care-of address field are bound, and be stored in the nested mobile network ATT of oneself; Then, after the address that this upper level mobile router will be somebody's turn to do the care-of address field in " home address notice message " replaces with the Care-of Address of self, transmit new " home address notice message " to its upper level mobile router;
(B3) after mobile router was received " home address notice message " in the middle of all, all operations of execution in step (B2) received " home address notice message " until the root mobile router;
(B4) after the root mobile router receives " home address notice message "; Home address in the home address field in this home address notice message and the Care-of Address in the care-of address field are bound, and be recorded in the nested mobile network ATT of oneself;
(B5) the root mobile router was to returned " home address announcement acknowledge message " to the next stage mobile router of its transmission " home address notice message " originally, and this home address announcement acknowledge message comprises the Care-of Address of root mobile router;
(B6) after mobile router receives " home address announcement acknowledge message " in the middle of; The Care-of Address of record root mobile router is simultaneously to returning this " home address announcement acknowledge message " to the next stage mobile router of its transmission " home address notice message " originally;
(B7) after mobile router is received " home address announcement acknowledge message " in the middle of all; All operations of execution in step (B6); After the mobile router of new access receives this " home address announcement acknowledge message ", preserve the Care-of Address of the root mobile router in this home address announcement acknowledge message;
(B8) the new mobile router that inserts judges whether it connects the next stage mobile router; If; Then newly insert mobile router and continue to be somebody's turn to do " home address announcement acknowledge message " to the forwarding of next stage mobile router, the next stage mobile router then continues the operation of execution in step (B7); Otherwise, stop forwarding the flow process of end step (B).
4. method according to claim 1 is characterized in that, said step (C) further comprises the following operations content:
(C1) newly insert mobile router and send " binding update messages ", upgrade positional information to its home agent; And nested networks flag and home address option are set respectively in this " binding update messages ", what the former identified its current access is nested networks; Address among the latter is the home address of this new access mobile router;
(C2) after the upper level mobile router receives this " binding update messages ", source address is wherein replaced with oneself Care-of Address, transmit " binding update messages " to its upper level mobile router then;
(C3) after mobile router was received " binding update messages " in the middle of all, all the operation of execution in step (C2) received " binding update messages " until the root mobile router;
(C4) after the root mobile router receives " binding update messages ", the source address in this binding update messages is replaced with oneself Care-of Address, send it to the home agent of new access mobile router then;
(C5) after the home agent that newly inserts mobile router receives " binding update messages " from the root mobile router; The Care-of Address of home address that newly inserts mobile router and root mobile router is bound; And returning " binding acknowledgement message ", the new address binding that inserts mobile router declares to be finished; Comprise second type of route field in this binding acknowledgement message, the address in this second type of route field is the home address of this new access mobile router;
(C6) after the root mobile router receives " binding acknowledgement message "; Address according in second type of route field wherein inquires earlier second type of this address in the route field pairing " next stage mobile router address " in the nested mobile network ATT; Again with the destination address that is somebody's turn to do in " the next stage mobile router address " replacement " binding acknowledgement message "; Then, be somebody's turn to do " binding acknowledgement message " to the next stage mobile router forwarding of correspondence; Simultaneously, the root mobile router is set up the tunnel with the new home agent that inserts mobile router;
(C7) after mobile router receives " binding acknowledgement message " in the middle of, check that whether the address in second type of route field in this binding acknowledgement message is complementary with self home address; If coupling shows that this mobile router is exactly the recipient of this " binding acknowledgement message ", the flow process of end step (C); Otherwise middle mobile router inquires second type of pairing next stage mobile router address, this address in the route field according to the address in this second type of route field in the nested mobile network ATT; Again with the destination address in this next stage mobile router address replacement " binding acknowledgement message "; And to next stage mobile router forwarding this " binding acknowledgement message ";
(C8) after all subordinate's mobile routers were received " binding acknowledgement message ", all operations of execution in step (C7) were until the flow process of end step (C).
5. method according to claim 1; It is characterized in that: time life cycle in the said nested mobile network ATT in certain mobile router entry is 0 o'clock; Show that this moment, this mobile router left this nested mobile network, should delete this mobile router pairing clauses and subclauses in the nested mobile network ATT; Therefore, each mobile router in the nested mobile network all will periodically send " home address updating message " to its upper level mobile router, keeps the life span of oneself.
6. according to claim 1 or 5 described methods, it is characterized in that: said step (D) further comprises the following operations content:
(D1) mobile router finds that time life cycle of oneself soon is at 0 o'clock, sends " home address updating message " to the upper level mobile router; This home address updating message structure is identical with " home address notice message ", and wherein care-of address field (MR_CoA) comprises the Care-of Address of this mobile router, and home address field (MR_HoA) comprises the home address of this mobile router;
(D2) after this upper level mobile router receives this " home address updating message "; After revising the life span of this mobile router entry in the nested mobile network ATT; Address in the care-of address field in the home address updating message is replaced with self Care-of Address, and transmitting to its upper level mobile router should " home address updating message " again;
(D3) after mobile router was received " home address updating message " in the middle of all, all operations of execution in step (D2) received this " home address updating message " until the root mobile router;
(D4) after the root mobile router receives this " home address updating message "; After revising the life span of this mobile router entry in the nested mobile network ATT; To the next stage mobile router transmission " home address renewal acknowledge message " of its transmission " home address updating message ", this home address upgraded the Care-of Address that comprises the root mobile router in acknowledge message to originally;
(D5) after this next stage mobile router receives " home address renewal acknowledge message "; The Care-of Address of record root mobile router; Simultaneously, this home address is upgraded acknowledge message and send to originally middle mobile router to its transmission " home address updating message ";
(D6) after mobile router was received " home address renewal acknowledge message " in the middle of all, all operations of execution in step (D5) received that until the mobile router of initiating this renewal nested mobile network ATT this home address upgrades acknowledge message;
After the mobile router of (D7) initiating this renewal nested mobile network ATT receives that home address upgrades acknowledge message, preserve the Care-of Address of root mobile router, the flow process of end step (D).
7. method according to claim 1 is characterized in that, the scene that node in said step (E) nested mobile network and correspondent node communicate comprises following two kinds:
(E1) transmitting uplink data: the mobile node MN in the nested mobile network is sent data to Correspondent Node CN;
(E2) downlink data transmission: the mobile node of Correspondent Node in nested mobile network sends data.
8. method according to claim 7 is characterized in that: in the said communication scenes (E1), further comprise the following operations content:
(E11) mobile node MN is sent packet, and source address wherein is the address of MN, and destination address is the address of Correspondent Node CN;
(E12) after MN place mobile network's mobile router receives this packet, it is encapsulated, source address wherein is the Care-of Address of this mobile router, and destination address is the address of its home agent; Simultaneously, mobile router increases the home address option that its numerical value is this mobile router home address in this data packet head; Then, mobile router is transmitted this packet to its upper level mobile router;
(E13) after this upper level mobile router is received this packet, whether comprise the home address option in the inspection packet,, then this source data packet address is replaced with the Care-of Address of oneself, transmit packet to its upper level mobile router again if comprise; Otherwise, show that this packet is that certain mobile node sends among this mobile network, just handles this packet according to step (E12) method;
(E14) after mobile router received this packet in the middle of all, all the operation of execution in step (E13) received this packet until the root mobile router;
(E15) after the root mobile router receives this packet, source address is wherein replaced with oneself Care-of Address, this packet is sent to the home agent of MN place mobile network's mobile router through the tunnel;
(E16) after the home agent of MN place mobile network's mobile router is received this packet, packet carried out decapsulation after, again this packet is transmitted to Correspondent Node CN, the communication process of end step (E).
9. method according to claim 7 is characterized in that: in the said communication scenes (E2), further comprise the following operations content::
(E21) CN sends packet, and source address wherein is the address of CN, and destination address is the address of mobile node MN; After this packet is forwarded to MN place mobile network's home agent according to conventional route; Home agent encapsulates this packet; Wherein source address is a hometown-agent-address, and destination address is the Care-of Address of root mobile router of the nested mobile network at this mobile network place; This packet also comprises second type of route field, and the address in second type of route field is the home address of MN place mobile network's mobile router; Then, this packet is forwarded to the root mobile router of nested mobile network;
(E22) after mobile router received this packet, whether the inspection earlier wherein address in second type of route field was identical with the home address of this mobile router, if identical, then carries out subsequent step (E23); Otherwise, redirect execution in step (E24):
(E23) identical because of the address in second type of route field in the packet with the home address of this mobile router, show that this mobile router is exactly purpose mobile node place mobile network's a mobile router; This mobile router carries out decapsulation to packet, and in this mobile network, transmits; The purpose mobile node receives this packet, the communication process of end step (E);
(E24) this mobile router is according to the address in second type of route field in the packet, in the nested mobile network ATT, inquire second type of this address in the route field pairing " next stage mobile router address " earlier after; Again with should " next stage mobile router address " replacing the destination address in this packet; Then, transmit this packet to the next stage mobile router of correspondence; After this next stage mobile router receives this packet, the operation of execution in step (E22).
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| CN107682903B (en) * | 2017-08-24 | 2020-09-29 | 中国互联网络信息中心 | Network mobile routing method based on identification |
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