CN100384167C - Mobile internet log-on technology based on IPV6 - Google Patents
Mobile internet log-on technology based on IPV6 Download PDFInfo
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Abstract
The present invention relates to a mobile internet accessing technology based on IPv6, which is an AD-HOC accessing internet technical scheme by using a one-way channel, ICMPv6, and a tunnel technology based on IPv6 and comprises a mobile AD-HOC nodal access gateway discovering technology, an AD-HOC node and internet communicating technology, and a technology combined with mobile IPv6 and a mobile network. Function entities in a basic frame mainly comprise mobile AD-HOC nodes and an access gateway which can be a router or a base station. The present invention has the advantages that the present invention effectively solves the problem of an AD-HOC network accessing to the Internet, reduces the discovering time delay of the access gateway and communication overheads brought to the AD-HOC network, and eliminates the overheads, etc. of the access gateway on the aspects of protocol conversion and address translation; moreover, the advanced technologies of mobile IPv 6, the mobile network, etc. are combined with the AD-HOC network.
Description
Technical field
The present invention relates to a kind of mobile internet cut-in method based on IPv6.
Background technology
AD-HOC one speech derives from Latin language, and original meaning is " for certain specific purpose (design) ".Here said " AD-HOC network " be meant by one group of autonomous node or terminal and cooperate with each other and form, be independent of fixing infrastructure and adopt the network of distributed management, is a kind of self-organizing and from supervising the network.Its origin can be traced back to the packet radio radio station network PRNET that ARPA in 1972 begins one's study.IEEE renames as AD-HOC (being self-organizing) network with packet radio radio station network when exploitation 802.11 standards; 1997 IETF (the Internet engineering duty group) set up MANET (mobile ad-hoc network) working group, and released a series of standard and draft.
Have the network of foundation structure to compare with tradition, the AD-HOC network can not have fixing foundation structure; The distributed operation of all nodes has the function of router, is responsible for finding and being maintained into the route of other node.This network both can isolated operation, can be linked into wired backbone network (as the internet) by gateway again.
The AD-HOC network has some outstanding characteristics: node usually at random moves in network, freely adds and exits network, and makes the network topology structure frequent variations; The link of limited bandwidth, volume-variable, factors such as multiple access, multipath fading, noise and signal interference will significantly reduce the throughput of radio communication; Mobile node usually relies on battery to provide energy, finite energy; Multi-hop communication, the transmitting power of radio node is limited, usually needs other intermediate node to come trunk information; Limited network security etc.
The AD-HOC network has broad application prospects: the rescue action of military operation and earthquake, floods or remote districts all is traditional application of AD-HOC network.It also can be used as wireless access network, and networking capability rapidly is provided.In local scope, notebook and palmtop computer can adopt the mode of AD-HOC to issue in meeting and shared information.
AD-HOC network insertion Internet technology present situation: at present, research to the AD-HOC network mainly concentrates on AD-HOC network self, comprise route, multicast, safety, link layer protocol and service quality etc., how it is inserted the also few of the Internet discussion, solution is also fewer.But in recent years, development along with personal communication and mobile internet technology, people also begin growing interest to the problem of AD-HOC network insertion the Internet, and some preliminary solutions have been proposed, the basic ideas of these schemes all are that a proxy gateway is set in the AD-HOC network, and each node in the AD-HOC network is connected to the Internet by this proxy gateway.The difference of these schemes is concrete realization mechanism difference, and as agent discovery technology, protocol conversion and address transition mechanism, proxy gateway working mechanism etc., some has also utilized mobile IP (being actually mobile IPv 4) technology in addition.
The technology that above-mentioned various scheme is adopted when solving AD-HOC network insertion the Internet can reduce following some: 1. technical at agent discovery, the node in the AD-HOC network utilizes various AD-HOC Routing Protocols to come passive discovery proxy gateway; Perhaps initiatively announce, announcement is sent to each node in the AD-HOC network by the mode that floods by proxy gateway.2. the node in the AD-HOC network uses home address, when communicating with the outside, by proxy gateway home address is converted to outside legal address; Perhaps combine, utilize Foreign Agent in the mobile IPv 4 to serve as the proxy gateway of AD-HOC network, with the problem of resolution protocol conversion and address transition with mobile IPv 4.3. proxy gateway often needs the address of AD-HOC network is managed; The agent discovery request of response AD-HOC node; Handle the register requirement of AD-HOC node; Carry out protocol conversion and address transition; The data that forwarding AD-HOC node is communicated by letter with external the Internet etc.
Although these schemes have solved the problem of AD-HOC network insertion the Internet to a certain extent, exist a lot of defectives, need further to improve and optimize.Listed apparent in view several point defects below:
(1) at the agent discovery technical elements: there is certain time delay in passive request mode, and discovery procedure often depends on concrete AD-HOC Routing Protocol, in addition, because the AD-HOC network itself is a loose self-organizing network, communication distance is limited, generally be multihop network, Routing Protocol generally mostly adopts as required and drives, and this becomes a relatively thing of difficulty with regard to the unified understanding that all nodes are kept the agency; Initiatively in the announcement mode, the flood announcement of proxy gateway of AD-HOC node, expense is too big, Limited resources in the serious waste AD-HOC network.
(2) protocol conversion of proxy gateway and address transition expense are big; Some document has been considered the combination with mobile IP, but is and the combination of mobile IPv 4, and the access node number is subjected to the restriction of Care-of Address number, and each node all must repeat repeatedly " flooding " operation when inserting, and causes the huge waste of resource.
(3) existing technical scheme has been considered the advantage of proxy gateway at aspects such as computational resource and power supplys, but does not consider the advantage of proxy gateway at aspects such as communication distances.
(4) the prior art scheme does not all have to represent with mobile IP v 6 and mobile network etc. the new technology combination of mobile Internet future thrust, can only be applicable to smaller scope, and extensibility is poor.
Mobile IP v 6 and mobile network's technology: for the mobility support of interference networks is provided, IETF has provided the mobile IP protocol based on the IPv4 network.Because mobile IPv 4 exists a lot of defectives at aspects such as address resource, fail safe and router efficiencies, IETF again based on the IPv6 design of protocol mobile IP v 6, and a series of draft and standard have been proposed in succession, wherein issued the standard of first mobile IP v 6 in June, 2004.
Mobile IP v 6 has been used the notion of many mobile IPv 4s, comprise mobile node, home agent, home address and Care-of Address, but mobile IP v 6 does not have Foreign Agent and foreign agent care-of address in definition, mobile node can use the address that defines among the IPv6 to dispose rules automatically, to obtain a co-located care-of address, this is the unique a kind of Care-of Address that defines in the mobile IP v 6.Header and scaling option that mobile IP v 6 has utilized IPv6 to dispose automatically, optimize have been simplified the design of main frame mobility protocol, have solved problems such as mobile IPv 4 ingress filtering, triangle route, and have reduced network overhead, have improved service behaviour.
Mobile IP has solved the mobility problem of node in the Internet, but does not solve the mobility problem of network (subnet), and therefore, IETF has set up NEMO (mobile network) working group, studies with the mobility to network.The mobile network has defined functional entitys such as mobile router and home agent, registers the mobility problem that solves whole network by mobile router on home agent.
Mobile IP v 6 and mobile network's technology are present technology very advanced in the mobile internet field, but also do not have the researcher that they are applied to the AD-HOC network at present, to increase AD-HOC network extensibility and range of application.The present invention combines AD-HOC network technology and mobile IP v 6 and mobile network's technology, has proposed a kind of mobile internet cut-in method based on IPv6.
Summary of the invention
In order to overcome existing AD-HOC network insertion to the existing a lot of defectives of the technical scheme of the Internet, and the deficiency that mobile IP v 6 or mobile network and AD-HOC network can not be combined, the invention provides a kind of mobile internet cut-in method based on IPv6.A kind of based on IPv6, utilize the AD-HOC of one-way channel, ICMPv6 and tunneling technique to insert the Internet technology scheme, and the AD-HOC network combined with mobile IP v 6 and mobile network, these contents combine, constituted a kind of new mobile internet cut-in method, comprised to solve prior art that proxy gateway finds that efficient is low, the protocol conversion of proxy gateway and existing problem such as the address transition expense is big, extensibility is relatively poor based on IPv6.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of mobile Internet cut-in method basic framework based on IPv6:
In this framework, functional entity mainly contains two: mobile ad-hoc node, IAD.
A kind of mobile internet cut-in method based on IPv6, based on IPv6, utilize the AD-HOC of one-way channel, ICMPv6 and tunneling technique to insert the Internet technology scheme, the AD-HOC network is combined with mobile IP v 6 and mobile network, contain IAD discover method, the AD-HOC node and the method for internet communication and the method that combines with mobile IP v 6 and mobile network of mobile ad-hoc node.
The job step of the IAD discover method of mobile ad-hoc node is as follows:
Step 1: IAD utilizes one-way channel regularly to send ICMPv6 packets to whole network, include the IAD announcement in this message, ICMPv6 packets is adopted in the announcement that IAD sent, and the inside is comprising oneself prefix and address, and oneself is the information of an IAD;
After ordinary node in the step 2:AD-HOC network is received this announcement, do not transmit this announcement, after each node is received the announcement of IAD, write down corresponding information, comprise the sequence number etc. of address, prefix and the announcement of IAD;
Step 3: if the AD-HOC node receives the announcement of at least 2 IADs, it surveys the accessibility of each IAD with regard to utilizing the algorithm in traditional AD-HOC network, and selects a gateway as oneself;
The method job step of AD-HOC node and internet communication:
Step 1:AD-HOC node is selected the nonlocal gateway of an IPv6 IAD as oneself, and utilizes the prefix in the IAD announcement to give oneself configuration a Care-of Address;
Step 2:AD-HOC node is initiated registration to the home agent of oneself;
Step 3: the structure of logon message is with reference to RFC3775 or draft-ietf-nemo-basic-support-03, utilize tunneling technique that logon message is encapsulated in the tunnel packet, the destination address of tunnel packet is the address of IAD, source address is the Care-of Address of this node, and sends this tunnel packet to the IPv6 IAD;
After step 4:IPv6 IAD is received tunnel packet,, it is forwarded according to the destination address of original message this tunnel packet decapsulation;
The home agent of step 5:AD-HOC node response registration, and provide one and reply;
After step 6:IPv6 IAD is received and replied, directly be transmitted to corresponding AD-HOC node, without tunnel encapsulation replying;
Step 7:AD-HOC node is received the response of home agent, finish after the registration process, other nodes in the Internet or respective communication node send data, equally according to standard RFC3775 or draft-ietf-nemo-basic-support-03 structure initial data message, the initial data message is encapsulated in the tunnel packet, issues the IPv6 IAD;
Step 8:IPv6 IAD is gone out the tunnel packet decapsulation with data forwarding, same, gives the AD-HOC node with the data forwarding of issuing the AD-HOC node that receives.
IPv6 and mobile IP v 6 have been adopted in the present invention, because IPv6 has abundant address space, so the AD-HOC node can all use legal global unique IPv6 address to communicate by letter with extraneous, IAD just needn't carry on an agreement and change and address transition like this, as long as it is the tunnel packet decapsulation from the AD-HOC node of being received, directly forwards the initial IP v6 message of the inside just passable.
The effect of invention: the invention has the beneficial effects as follows that not only effectively having solved the AD-HOC network insertion (has reduced time delay that IAD finds and the communication overhead that brings to the AD-HOC network to the problem of the Internet; Eliminated the expense of IAD aspect protocol conversion and address transition etc.), and success advanced technology such as mobile IP v 6 and mobile network and AD-HOC network are combined, established the necessary technology basis for the development of mobile internet, good economic benefit and social benefit have been arranged.
Description of drawings
The present invention is further described below in conjunction with drawings and Examples.
Fig. 1 is a typical scene of the present invention;
Fig. 2 is the flow chart of technical solution of the present invention framework;
Fig. 3 is embodiment 2 schematic diagrames;
Fig. 4 is embodiment 3 schematic diagrames.
Embodiment
Embodiment 1: a kind of mobile Internet cut-in method basic framework based on IPv6:
Functional entity mainly contains two in framework of the present invention: mobile ad-hoc node, IAD.The former position often changes, and topology change each other is frequent; The latter has higher power and performance, and its coverage is bigger, almost can contain the scope of whole AD-HOC network, and its energy (power supply) is also unrestricted in addition.Its typical scene as shown in Figure 1.
In Fig. 1, the great circle of outside is represented the coverage of IPv6 IAD, as can be seen, has the one-way channel from IAD to each AD-HOC node; But has only the two-way channel between a few node existence and the IAD.
Improvement technical scheme proposed by the invention is described below.
(1) the IAD discovery procedure of AD-HOC node:
Traditional various the Internets access scheme mostly is based on two-way channel, this will produce a problem when being applied to the AD-HOC network, be not have a two-way channel between most of AD-HOC nodes and the IAD, because the communication distance of AD-HOC node is very limited.Existing various schemes are when addressing this problem, all utilize other AD-HOC nodes between source AD-HOC node and the IAD to make relaying, therefore, the pattern of the passive discovery of IAD is that source AD-HOC node is found request by intermediate node broadcasting IAD; And at IAD initiatively under the discovery mode, each AD-HOC node also is the IAD announcement that it receives that floods, and causes very big expense.In fact, existing various schemes are all regarded one-way channel as in the AD-HOC network a limiting factor, and attempt to avoid it.
And in scheme proposed by the invention, then be to utilize this one-way channel fully, realize of the cognition of AD-HOC node with the expense of minimum to IAD.Concretely, be exactly IAD utilize one-way channel regularly to send ICMPv6 packets to whole network (communication range of IAD is bigger, the communication range of AD-HOC node then is much smaller, promptly often there is channel from IAD to the AD-HOC node, and there is not channel from the AD-HOC node to IAD, except from the near especially some nodes of IAD), include the IAD announcement in this message, be in order to increase the extensibility of this scheme just why with ICMPv6, and technology combinations such as convenient and mobile IP v 6; After ordinary node in the AD-HOC network is received this announcement, do not transmit this announcement, because the announcement of using the node in the feasible almost whole AD-HOC network of one-way channel can receive IAD; After each node is received the announcement of IAD, write down corresponding information, comprise the sequence number etc. of address, prefix and the announcement of IAD, send data to outside node later on, just can transmit by IAD.Like this, this scheme just can realize that node in the whole AD-HOC network keeps the correct cognition to IAD.
The announcement that IAD sent can be adopted ICMPv6 packets, and the inside is comprising oneself prefix and address, and oneself is the information of an IAD.The present invention has defined a kind of new ICMPv6 packets for it, and form is as shown in table 1.
Table 1:
Wherein the value of type field can be made as 150, represents that this is announced icmp packet to the AD-HOC node by IAD, and gateway ID is a mark number of this gateway, and sequence number is this message newness degree of sign, is prefix at last.This announcement does not need the AD-HOC node to do any response, its objective is to allow whole AD-HOC network all know, if be linked into the Internet, can pass through this gateway forwards so.
Certainly, at this moment a problem is arranged, if a node is positioned within the coverage that is positioned at two or more IADs simultaneously exactly, how to select the gateway of oneself, some traditional algorithms may be no longer suitable, and signal power does not just necessarily represent by force yet and can insert (such as there are not other nodes sometimes near IAD) sometimes.In fact the key of this problem is possible have various scene, such as, in the short range of certain IAD all there be not a node, in the medium and long distance scope, then there are some nodes, these nodes just might be used as it the gateway of oneself so, but these packets are what to send out less than this IAD because do not have can relaying node.Change with regard to the processing policy that needs the AD-HOC node like this.Different with legacy network, mobile node can not be thought the advertising of route bag of receiving an IAD, just thinks that this gateway is (existence of one-way channel) that can reach, but the process of a detection will be arranged.Suppose that an AD-HOC node receives the announcement of N IAD, it surveys the accessibility of each IAD with regard to utilizing the algorithm in traditional AD-HOC network, and selects a gateway as oneself that can reach.This compares with the passive discovery mode of the IAD in the traditional scheme, survey although also need, but because it has the tabulation of optional IAD, so when surveying, can accomplish to shoot the arrow at the target, not only can reduce the communication overhead of source AD-HOC node and intermediate node, and can quicken the process that IAD is found.
For conventional solution, IAD proposed by the invention finds that the advantage of scheme is clearly: needn't the flood announcement of IAD of intermediate node; Even source node carries out the passive discovery of IAD, expense and time delay are also very little.Therefore, existing than higher operating efficiency, expense is smaller again.
(2) course of work of AD-HOC node and internet communication:
After an AD-HOC node had known can be connected to the Internet by certain IAD, it just can pass through this gateway and internet communication from now on so.Concrete communication process is described below.
Because the present invention is combined togather AD-HOC network and mobile IP v 6 and mobile network, therefore, the AD-HOC node is supported mobile IP v 6, can utilize Care-of Address of prefix configuration of IAD so.When its needs to the outside a node to send data (before sending, the AD-HOC node will judge that whether destination node is the node outside the present networks, the relatively good solution of this problem, utilize existing AD-HOC Routing Protocol just can accomplish), can utilize tunneling technique to encapsulate an IPv6 message again in the raw data packets outside, the destination address of outer message is the address of IAD, and source address is the Care-of Address of this node.Doing like this is because whether destination address is belonged to the judgement of local AD-HOC network, should be carried out by source node, and should not done by the forward node of centre.Like this, source node just can send a tunnel packet to IAD, by IAD this is wrapped decapsulation, and forwards.How to arrive IAD as for this tunnel packet, then can utilize traditional AD-HOC Routing Protocol to solve from the AD-HOC source node.
It is to be noted, IPv6 and mobile IP v 6 have been adopted in the present invention, because IPv6 has abundant address space, so the AD-HOC node can all use legal global unique IPv6 address to communicate by letter with extraneous, IAD just needn't carry on an agreement and change and address transition like this, as long as it is the tunnel packet decapsulation from the AD-HOC node of being received, directly forwards the initial IP v6 message of the inside just passable.
Therefore, technical scheme proposed by the invention also can effectively reduce the expense (as protocol conversion and address transition) of IAD.
(3) combining of the present invention and mobile IP v 6 and mobile network:
In the technical program, introduce mechanism such as mobile IP v 6 and mobile network, realized the mobility of ordinary node in the whole network in the AD-HOC network, increased the AD-HOC network extensibility greatly.Just set forth the scheme of combination below.
The at first combination of consideration and mobile IP v 6, after a mobile ad-hoc node is transferred to a nonlocal networking, it will receive the ICMPv6 announcement of nonlocal AD-HOC network access gateway, whether it just detects this gateway and can reach then, if can reach, just utilize this announcement to give oneself configuration a Care-of Address.When other node communications in it and the Internet, the standard RFC3775 of mobile IP v 6 is all followed in the generation of various original messages (comprise the logon message to home agent, and the routing optimality message between the communication node, issue the common message of communication node etc.).When sending this message, again this message is encapsulated in the described tunnel packet at last.If it receives the announcement of a plurality of nonlocal AD-HOC network access gateway, it just judges the accessibility of each gateway so, and selects one of them, gives oneself configuration a Care-of Address.Other treatment of details is the same.
The AD-HOC network also can combine with mobile network's technology.At this moment, after a mobile router (being equivalent to an AD-HOC node) moved to the other places, it also can receive the ICMPv6 announcement of nonlocal AD-HOC network access gateway.The structure of various original messages can list of references draft-ietf-nemo-basic-support-03,, same, it selects a gateway by detecting the accessibility of gateway, and utilizes tunneling technique that packet is accordingly sent out.
The flow chart of technical solution of the present invention framework:
For main contents of the present invention there being a understanding clearly, the flow chart of the technical scheme that the present invention carries of having drawn as shown in Figure 2.Need to prove that this flow chart has just been expressed the framework of technical scheme, detail such as above-mentioned content.In addition, for for simplicity, the mobile router among the mobile network also abstract be the AD-HOC node.Solution shown in this flow chart can realize AD-HOC node moving in the whole network.Step is as follows;
Step 1:AD-HOC node (supporting mobile IP v 6 or mobile network) is monitored the IAD announcement;
Step 2:IPv6 IAD utilizes one-way channel regularly to send router advertisement to whole AD-HOC network, be the ICMPv6 packets form shown in the table 1, include the IAD announcement in this message, the announcement that IAD sent can be adopted ICMPv6 packets, the inside is comprising oneself prefix and address, and oneself is the information of an IAD;
Step 3:AD-HOC node receives the announcement of this IAD, and information such as record gateway address, ID prefix and announcement sequence number are not transmitted it;
Step 4:AD-HOC node is according to this IAD announcement that receives, and utilizes algorithm in traditional AD-HOC network to survey the accessibility of each IAD, and autotelic accessibility to the IPv6 IAD is surveyed;
Step 5: judge the accessibility of IAD, select a gateway as oneself that can reach, have accessibility to change step 6 over to; Otherwise change step 1 program over to and open top;
Step 6:AD-HOC node is the nonlocal gateway of this IPv6 IAD as oneself, when its node to the outside sends data, utilize the Care-of Address of prefix configuration in the router advertisement, before sending, whether the existing AD-HOC Routing Protocol decision node of AD-HOC node utilization is the node outside the present networks;
Step 7:AD-HOC node is supported mobile IP v 6 (or mobile network), to home agent (also the comprising communication node sometimes) registration of oneself;
Step 8: utilize tunneling technique to encapsulate an IPv6 message again in the raw data packets outside, when other node communications in it and the Internet, various original messages (comprise the logon message to home agent, and the routing optimality message between the communication node, issue the common message of communication node etc.) structure of the logon message that generates is with reference to the standard RFC3775 and the draft-ietf-nemo-basic-support-03 of mobile IP v 6, the destination address of outer message is the address of IAD, source address is the Care-of Address of this node, carry out the judgement that whether destination address is belonged to local AD-HOC network by source node, source node sends a tunnel packet to IAD;
Step 9: utilize traditional AD-HOC Routing Protocol that this tunnel packet is arrived IAD from the AD-HOC source node;
After step 10:IPv6 IAD was received tunnel packet, this tunnel packet decapsulation, the tunnel packet that will wrap decapsulation according to the destination address of original message forwarded;
The home agent of step 11:AD-HOC node (or communication node) response registration, and provide one and reply;
After step 12:IPv6 IAD is received and replied, directly be transmitted to corresponding AD-HOC node, without tunnel encapsulation replying;
Step 13:AD-HOC node is received the response of home agent (or communication node), finish registration process, in the Internet other node or respective communication node send data afterwards, equally, according to relevant protocol specification structure initial data message, the initial data message is encapsulated in the tunnel packet, issues the IPv6 IAD;
Step 14:IPv6 IAD is gone out the tunnel packet decapsulation with data forwarding, same, gives the AD-HOC node with the data forwarding of issuing the AD-HOC node that receives.
In Fig. 2, preceding 4 steps belong to IAD to be found, each step of back is the detailed process of AD-HOC node and PERCOM peripheral communication.In Fig. 2, suppose that the AD-HOC node motion has arrived the other places, can embody combining of mobile IP v 6 (or mobile network) and AD-HOC so fully.
The following examples 2,3 are for reference when specific implementation the present invention puies forward technical scheme.These two embodiment combine mobile IP v 6 and mobile network respectively.
Embodiment 2 as shown in Figure 3.For for simplicity, 4 AD-HOC nodes have only drawn among the figure.
In Fig. 3, the IPv6 IAD is responsible for the data forwarding between AD-HOC network and the Internet; Each node in the AD-HOC network is all supported mobile IP v 6; There is one-way channel between IPv6 gateway and all nodes, and has two-way channel between node A, the B.Job step is as follows:
1. the IPv6 IAD utilizes the router advertisement of one-way channel to whole AD-HOC Web broadcast ICMPv6 form;
2. after each AD-HOC node is received this announcement, write down corresponding information, comprise the sequence number of gateway address, prefix, ID and announcement, each node all must not be transmitted this announcement;
3. be example with node D, if it will be surfed the Net, utilize the accessibility of this gateway of IAD announcement checking of receiving earlier, Ruo Keda just utilizes the prefix in the IAD announcement to give oneself configuration a Care-of Address;
4. node D at first constructs an original mobile IPv 6 message (form meets RFC3775), then original message is encapsulated in the tunnel packet, and the destination address of tunnel packet is made as the address of IAD;
5. node D utilizes the AD-HOC Routing Protocol that this tunnel packet is sent to IAD;
6. IAD is received this tunnel packet, with its decapsulation, the original mobile IPv 6 message of the inside is forwarded;
7. IAD the bag of issuing node D that it is received from the outside directly is transmitted to D, to reduce expense.
Embodiment 3 as shown in Figure 4.Mobile router wherein just is equivalent to the AD-HOC node.
In Fig. 4, each mobile router can also connect one's own child node; The IPv6 IAD is responsible for the data forwarding between AD-HOC network and the Internet; Each mobile router is all supported the mobile network; There is one-way channel between IPv6 IAD and all mobile routers, and has two-way channel between mobile router A, the B.Job step is as follows:
1. the IPv6 IAD utilizes the router advertisement of one-way channel to whole AD-HOC Web broadcast ICMPv6 form;
2. after each mobile router is received this announcement, write down corresponding information, comprise the sequence number of gateway address, prefix, ID and announcement, each mobile router all must not be transmitted this announcement; Notice that the child node that mobile router connected is not done any processing to this announcement;
3. be example with the node M, if it will be surfed the Net, be connected to mobile router C earlier, C utilizes the accessibility of the IAD announcement validation gateway of receiving, Ruo Keda just utilizes the prefix in the IAD announcement to give oneself configuration a Care-of Address;
4. node M is issued mobile router C to data, mobile router C is according to document draft-ietf-nemo-basic-support-03, construct original mobile network's message again, then original message is encapsulated in the tunnel packet, the destination address of tunnel packet is made as the address of IAD;
5. mobile router C utilizes the AD-HOC Routing Protocol that this tunnel packet is sent to IAD;
6. IAD is received this tunnel packet, with its decapsulation, the original message of the inside is forwarded;
7. IAD the bag of issuing node M that it is received from the outside is transmitted to mobile router C, without tunnel encapsulation, to reduce expense;
8. mobile router C gives M the data forwarding of issuing child node M.
Claims (1)
1. mobile internet cut-in method based on IPv6, it is characterized in that: based on IPv6, utilize the AD-HOC of one-way channel, ICMPv6 and tunneling technique to insert the Internet technology scheme, the AD-HOC network is combined with mobile IP v 6 and mobile network, contain the method for IAD discover method and the AD-HOC node and the internet communication of mobile ad-hoc node;
The job step of the IAD discover method of mobile ad-hoc node is as follows:
Step 1: IAD utilizes one-way channel regularly to send ICMPv6 packets to whole network, include the IAD announcement in this message, ICMPv6 packets is adopted in the announcement that IAD sent, and the inside is comprising oneself prefix and address, and oneself is the information of an IAD;
After ordinary node in the step 2:AD-HOC network is received this announcement, do not transmit this announcement, after each node is received the announcement of IAD, write down corresponding information, comprise the sequence number of address, prefix and the announcement of IAD;
Step 3: if the AD-HOC node receives the announcement of at least 2 IADs, it surveys the accessibility of each IAD with regard to utilizing the algorithm in traditional AD-HOC network, and selects a gateway as oneself;
The method job step of AD-HOC node and internet communication:
Step 1:AD-HOC node is selected the nonlocal gateway of an IPv6 IAD as oneself, and utilizes the prefix in the IAD announcement to give oneself configuration a Care-of Address;
Step 2:AD-HOC node is initiated registration to the home agent of oneself;
Step 3: the structure of logon message is with reference to RFC3775 or draft-ietf-nemo-basic-support-03, utilize tunneling technique that logon message is encapsulated in the tunnel packet, the destination address of tunnel packet is the address of IAD, source address is the Care-of Address of this node, and sends this tunnel packet to the IPv6 IAD;
After step 4:IPv6 IAD is received tunnel packet,, it is forwarded according to the destination address of original message this tunnel packet decapsulation;
The home agent of step 5:AD-HOC node response registration, and provide one and reply;
After step 6:IPv6 IAD is received and replied, directly be transmitted to corresponding AD-HOC node, without tunnel encapsulation replying;
Step 7:AD-HOC node is received the response of home agent, finish after the registration process, other nodes in the Internet or respective communication node send data, equally according to standard RFC3775 or draft-ietf-nemo-basic-support-03 structure initial data message, the initial data message is encapsulated in the tunnel packet, issues the IPv6 IAD;
Step 8:IPv6 IAD is gone out the tunnel packet decapsulation with data forwarding, same, gives the AD-HOC node with the data forwarding of issuing the AD-HOC node that receives.
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