CN100426790C - Method for increasing hometown agent message retransmission property in mobile IP network - Google Patents
Method for increasing hometown agent message retransmission property in mobile IP network Download PDFInfo
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- CN100426790C CN100426790C CNB2005100051841A CN200510005184A CN100426790C CN 100426790 C CN100426790 C CN 100426790C CN B2005100051841 A CNB2005100051841 A CN B2005100051841A CN 200510005184 A CN200510005184 A CN 200510005184A CN 100426790 C CN100426790 C CN 100426790C
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Abstract
The present invention relates to a method for increasing the of home proxy message retransmission property in a mobile IP network. When a mobile node registers to a home proxy, corresponding routing list items are increased on a routing list of the home proxy, binding buffering information of the mobile node is recorded on the list items. Therefore, when messages are transmitted to the mobile node by a communication node, the messages can be directly determined as messages transmitted to the mobile node during a routing search process, and the packaging retransmission processing of the messages is carried out by using the binding buffering information corresponding to the home address. Therefore, with the present invention, whether the received messages are the messages transmitted to the mobile node, the messages can be distinguished during the routing search process of usual transmission messages, and no additional search for the binding buffering is needed to determine that whether the messages are transmitted to the mobile node. Besides, the method effectively reduces search times of the messages which are transmitted to the mobile node through a tunnel for the binding buffering, and therefore, the transmission property of the messages of the home proxy is enhanced.
Description
Technical field
The present invention relates to the mobile communication technology field, relate in particular to a kind of method that improves hometown agent message retransmission property in the mobile IP network.
Background technology
Mobile IP comprises mobile IPv 4 and mobile IP v 6, and these two kinds of agreements can make mobile node move to other foreign link and need not change the moving nodes local address from a home link, thereby keeps communication.
The networking structure of mobile IP network is shown in Figure 1A and Figure 1B, Figure 1A is the mobile IPv 4 network, Figure 1B is the mobile IP v 6 network, comprises mainly in the mobile IP network that mobile node, home agent, Foreign Agent and communication node, wherein said Foreign Agent only are present in the mobile Ipv4 network.
Described mobile node is after changing Network Access Point, and communication node still can utilize the home address of mobile node to communicate with.The message that sends to mobile node can be routed to mobile node by home agent, and does not need to consider the current location of mobile node on internet (the Internet).
Described home agent is the entity device that is positioned on the moving nodes local network, for example can be the router on the home link of mobile node.The home address of in store mobile node and identity information in the home agent.Move to field network so that work as mobile node from home network, can keep by the address of preserving in the home agent not interrupting with existing connection of other communication nodes.
Described communication node is the peer node that has established a communications link with mobile node, and communication node can be the terminal equipment that moves, and also can be the node device of fixing.
Described Foreign Agent is the equipment that uses in the mobile IPv 4 network, is the router on the field network at mobile node place, when mobile node is registered, can provide routing function to mobile node; Foreign Agent is responsible for the message that needs that decapsulation sends by the tunnel from home agent send to mobile node; For the message that mobile node sends, Foreign Agent can be used as default router.
In the mobile IPv 4 network, when mobile node has moved to field network, then outwards the agency sends register requirement, Foreign Agent will verify that effective register requirement is forwarded to home agent, and generate the banding cache list item of mobile node at home agent, be used to write down the home address of having registered, send to mobile node by the tunnel of setting up on the home agent so that needs are sent to the message of mobile node to home agent.
In the mobile IP v 6 network, when mobile node moves to foreign link from home link, mobile node can be registered home address and present care-of address information to home agent.Like this, when the local agency intercepts and captures the message that will send to corresponding mobile node home address at home link, just can utilize described present care-of address information that the message of intercepting and capturing is carried out corresponding encapsulation process, afterwards, described message is sent to the Care-of Address of mobile node registration, thereby after guaranteeing that mobile node moves to the other places, still can under the situation that does not change home address, normally carry out the reception of message.
For this reason, need on the home agent of mobile IP to safeguard that the banding cache database is recorded in the mobile node of registering on the home agent.Record the home address of mobile node and the corresponding relation of mobile node present care-of address in the banding cache, described Care-of Address is that mobile node moves to the new address that obtains behind the field network.
According to RFC3775 as can be known, in mobile Ipv6 network, support at home agent can realize the function of banding cache by any way under the prerequisite of forwarding capability.For example, the destination buffer memory of the node that can safeguard with Neighbor Discovery Protocol of banding cache combines.When sending message, search before the destination buffer memory of neighbours' discovery, need search banding cache.
Concerning normal IP transmitted processing procedure, if adopt said method, then corresponding search procedure to address information of mobile node was:
(1), determines next jumping routing iinformation of message to the route querying of mobile node address;
(2) banding cache is searched, and is the home address of mobile node with the destination address of determining message.And after obtaining necessary information, send data to mobile node by the tunnel.
(3), need search neighbor cache and obtain direct non-moving neighbours if banding cache is searched failure.
As can be seen, be forwarded to the message of mobile node for needs, home agent needs repeatedly to search in transmitting processing procedure, and this will inevitably reduce home agent to sending to mobile node message forwarding performance.
Summary of the invention
In view of above-mentioned existing in prior technology problem, the purpose of this invention is to provide a kind of method that improves hometown agent message retransmission property in the mobile IP network, with minimizing number of times of searching to banding cache when sending message to mobile node by the tunnel, thus the message forwarding performance of raising home agent.
The objective of the invention is to be achieved through the following technical solutions:
The invention provides a kind of method that improves hometown agent message retransmission property in the mobile IP network, comprising:
A, in mobile IP network, when mobile node when home agent is registered, home agent increases in routing table and the route table items of the banding cache information correspondence of mobile node;
B, when communication node when mobile node sends message, then determine the banding cache information of the mobile node of the described message of reception by the direct described routing table of inquiry;
C, utilize described banding cache information that described message is encapsulated, and send to described mobile node.
Described steps A comprises:
The banding cache information of mobile node is directly stored in A1, employing in routing table;
Perhaps,
The banding cache information index is preserved in A2, employing in corresponding routing table, utilize this index can obtain concrete banding cache information.
Described steps A 1 comprises:
Have only when the home address of determining banding cache information correspondence not with routing table in existing address information when mating fully, described banding cache information just is added in the routing table.
Described banding cache information comprises:
The home address information of mobile node and the corresponding relation of Care-of Address.
Among the present invention, the information that writes down in described route table items also comprises the flag bit of outgoing interface information or outgoing interface information correspondence, the outgoing interface information of the route table items of described mobile node correspondence is mobile IP interface message, and whether described flag bit also can be used to distinguish is the message that sends to mobile node.
Described mobile IP interface message can for:
Mobile IPv 4 interface message, or mobile IP v 6 interface message.
Described step B comprises:
The home agent of B1, mobile node is intercepted and captured the message that communication node sends to mobile node on home network;
The route table items that mates in B2, the destination address information table of query and routing of home agent according to the message carrying, and, determine the banding cache information of the mobile node of the described message of reception according to banding cache or banding cache index in the route table items of coupling.
Described step B2 also comprises:
Determine that according to the outgoing interface information in the route table items of coupling or the flag bit of described outgoing interface information correspondence described message is the message that mails to mobile node.
Described step C comprises:
Utilize described banding cache information that the message that sends to mobile node is carried out encapsulation process;
Message after the encapsulation process is sent to the corresponding mobile node.
The method of hometown agent message retransmission property also comprises in the described raising mobile IP network:
When the mobile node network of coming back to hometown, and when the home agent cancel register, the route table items of the banding cache information correspondence of the described and mobile node that from routing table, increases in the deletion registration process.
As seen from the above technical solution provided by the invention, the present invention directly is increased to the home address information of mobile node in the routing table when home agent is registered at mobile node.Thereby make in the common route querying process that E-Packets, just can distinguish whether the message that receives is the message that mails to mobile node, and need not again banding cache to be carried out extra searching to distinguish.Therefore, the present invention can reduce the number of times of searching to banding cache to the message that mails to mobile node by the tunnel, thereby improves the message forwarding performance of home agent.
In addition, among the present invention, in routing table, safeguard the index of banding cache, the situation that comprises a plurality of interface boards for router as home agent, can also reduce the transparent transmission process of message between each plate, thereby save the resource of router, further improve the performance that its message is transmitted.
Description of drawings
Figure 1A is the networking structure schematic diagram of mobile IPv 4 network;
Figure 1B is the networking structure schematic diagram of mobile IP v 6 network;
Fig. 2 is the flow chart of method of the present invention;
Fig. 3 is the schematic diagram of the banding cache index list item in the routing table;
Fig. 4 is the message dissemination system schematic diagram in the router.
Embodiment
Core concept of the present invention is: when mobile node when home agent is registered, just in the routing table of home agent, increase corresponding route table items, writing down the banding cache information of described mobile node in the list item, like this, when communication node when mobile node sends message, just can determine directly in the route querying process that the destination address of described message is the home address of mobile node, and utilize the banding cache information of described home address correspondence to carry out the message forwarding processing.After mobile node is come back to hometown network, in the time of the home agent cancel register, also from routing table, delete the route entry of the correspondence of adding in the registration process simultaneously.
That is to say, when needs are created the banding cache of mobile node, then in routing table, increase corresponding route table items.Like this, can determine just at the route querying process of message whether the message that will transmit is the message that need send to the mobile node of having registered.And, can in routing table, safeguard a unique banding cache index among the present invention, can from the routing table lookup process, directly obtain the binding index, to determine the banding cache information of message.Under the situation that a plurality of interface boards are arranged in the system, can also further reduce and search number of times and the transparent transmission number of times of message between each interface board.
For the present invention there being further understanding, method of the present invention is described in detail below in conjunction with accompanying drawing.
The specific implementation of method of the present invention may further comprise the steps as shown in Figure 2:
Step 21: home agent is accepted the effective log-on message of a mobile node, and goes up the banding cache information of successful this mobile node of interpolation at this router (being home agent);
Be specially: home agent is received the local register requirement of mobile node, then after checking the validity of binding registration, the home address of corresponding mobile node and address information etc. is added in the corresponding banding cache;
Step 22: the index value that generates this banding cache of unique identification for described banding cache information;
Be about to the banding cache of home address correspondence, produce a unique sign (being index value) and be different from other banding caches, the index of each banding cache must be unique;
Certainly, also banding cache information directly can be stored in the routing table, at this moment, need not to generate institute and reach index value, promptly in step 23, directly the banding cache information with the mobile node correspondence is added in the routing table;
When in routing table, directly adding banding cache information, should guarantee not exist in the routing table item that mates fully with home address, with the problem that prevention is caused by load balancing,, then can't determine this message forwarding strategy if other and the item that home address mates are arranged.Actually i.e. message that mails to mobile node, Hai Shi a normal message of transmitting will can't be determined because two matched routings are arranged;
Step 23: increase corresponding route table items in routing table, the address of described route table items is the home address of mobile node, simultaneously, also comprises the corresponding informance of described banding cache in this route table items, or the index value of record banding cache;
Promptly increased the index value of banding cache in the route table items of creating at described address information of mobile node, described index value points to the banding cache information of this mobile node correspondence, as shown in Figure 3;
For the mobile node of mobile IP v 6, the prefix length of address is 128 in this route table items, and the outgoing interface information of route table items is the mobile IP v 6 interface, and certainly, if the mobile node of IPv4, then the outgoing interface information of route table items is the mobile IPv 4 interface;
In routing table, also can no longer create mobile IP v 6 interface or IPv4 interface, but reach the purpose of distinguishing mobile IP v 6 or IPv4 route and other routes by the flag bit of interpolation outgoing interface information, described flag bit can determine whether this route table items is to add in the mobile node registration process, so that determine whether described message is the message that mails to mobile node;
At the mobile IPv 4 network, described mobile IP interface is to be logic interfacing of mobile IP maintenance on router, and this interface is as the outgoing interface of message on router that sends to mobile node, the i.e. incoming interface in tunnel between home agent and mobile node.
Process above-mentioned steps 21 is to the processing of step 23, in described route table items, increased the index information of corresponding banding cache or banding cache, like this, when carrying out the route querying processing at message to be transmitted, the information of depositing is tied up in the binding that just can directly obtain forwarding needs.
Step 24: the home agent of mobile node registration is intercepted and captured the message that sends to mobile node, and carries out route querying according to the destination address that carries in the message on home agent;
Step 25: determine the route table items of mobile node correspondence by route querying, obtain the outgoing interface of mobile node and the banding cache information of mobile node correspondence;
The outgoing interface information of the route table items of corresponding coupling is mobile IP v 6 interface or mobile IPv 4 interface in routing table, just can determine that according to this interface message this route table items is the route table items of mobile IP v 6 or mobile IPv 4, perhaps determines according to described flag bit.Determined that this message need be sent to the corresponding mobile node, then, obtained the banding cache information of mobile node.
Obtaining of the banding cache information of mobile node is that index value by described banding cache obtains, be specially: inquiry obtains the index value of banding cache from routing table, then, utilize described index value to find corresponding banding cache, thereby obtain the information of the described message of encapsulation; If binding information directly is stored in the routing table, then can directly obtain corresponding packaging information.
Step 26: after utilizing described banding cache information that described message is encapsulated, send to the corresponding mobile node by corresponding interface, promptly mobile node and the tunnel of determining by described mobile IP interface between home agent sends to the corresponding mobile node with described message.
By foregoing description as can be seen, method of the present invention can be applicable to respectively in mobile IPv 4 and the mobile IP v 6 network, and, if be applied in mobile IP v 6 or the mobile IPv 4, so that the routing table in mobile IP v 6 or the mobile IPv 4 router is improved renewal, will effectively improve router to the message forwarding handling property.
Below in conjunction with concrete application process of the present invention characteristics of the present invention are described.
As shown in Figure 4, in distributed system, situation with a plurality of interface boards, if adopt scheme of the prior art, then before searching the destination banding cache, need carry out searching of banding cache separately, like this, after interface board is received message, this interface board can be delivered to message the interface board of the interface (interface that promptly has the home address prefix) of home network, if if the purpose mobile node of described message has been registered corresponding Care-of Address, then message has and need carry out that transparent transmission just can forward between 2 plates, shown in the thick empty arrow line among Fig. 4.Message need transmit between following each interface board in this process:
1, the interface board that comprises the incoming interface of message;
2, the interface board that comprises the interface (mobile IP interface) of home network;
3, the interface board that comprises the outgoing interface of Care-of Address correspondence.
Still with the above-mentioned example that is assumed to be, if use the present invention, binding information can obtain at the interface board that message receives, and this all is the same on each plate because of routing table, comprises all routing iinformations.And, because corresponding banding cache is added in the routing table, so can on each interface board, directly obtain identical information.Utilize the present invention, shown in the solid arrow line among Fig. 4, comprising at the interface board that needs process in the message forwarding processing procedure:
1, interface board has comprised the incoming interface of message;
2, interface board has comprised the outgoing interface of Care-of Address.
Therefore, as shown in Figure 4, as can be seen, when mobile node moves to the other places, and after in home agent, having registered corresponding Care-of Address, utilize the present invention, can significantly reduce the information of transmitting between interface board, thereby save the processing resource of home agent, improve the message forwarding performance of home agent.
Among the present invention, the technical scheme that described banding cache and routing table combine can also be extended to communication node, promptly increases banding cache information in the routing table in communication node.For the communication node of supporting routing optimality, mobile node also can be registered to communication node, gets access to binding information on communication node.Communication node also can be looked into route earlier when mobile node sends message so.If also adding, so the same in registration with the processing of home agent with the route entry of banding cache information correspondence, economized the search procedure of a binding table, a route querying just can be found the binding information of correspondence.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (10)
1, a kind of method that improves hometown agent message retransmission property in the mobile IP network is characterized in that, comprising:
A, in mobile IP network, when mobile node when home agent is registered, home agent increases in routing table and the route table items of the banding cache information correspondence of mobile node;
B, when communication node when mobile node sends message, then home agent is determined the banding cache information of the mobile node of the described message of reception by the direct described routing table of inquiry;
C, utilize described banding cache information that described message is encapsulated, and send to described mobile node.
2, the method for hometown agent message retransmission property in the raising mobile IP network according to claim 1 is characterized in that described steps A comprises:
The banding cache information of mobile node is directly stored in A1, employing in routing table;
Perhaps,
The banding cache information index is preserved in A2, employing in corresponding routing table, utilize this index can obtain concrete banding cache information.
3, the method for hometown agent message retransmission property in the raising mobile IP network according to claim 2 is characterized in that described steps A 1 comprises:
Have only when the home address of determining banding cache information correspondence not with routing table in existing address information when mating fully, described banding cache information just is added in the routing table.
4, the method for hometown agent message retransmission property in the raising mobile IP network according to claim 1 is characterized in that described banding cache information comprises:
The home address information of mobile node and the corresponding relation of Care-of Address.
5, according to the method for hometown agent message retransmission property in claim 1,2, the 3 or 4 described raising mobile IP networks, it is characterized in that, the information that writes down in described route table items also comprises the flag bit of outgoing interface information or outgoing interface information correspondence, the outgoing interface information of the route table items of described mobile node correspondence is mobile IP interface message, and whether described flag bit is used to distinguish is the message that sends to mobile node.
6, the method for hometown agent message retransmission property in the raising mobile IP network according to claim 5 is characterized in that, described mobile IP interface message is:
Mobile IPv 4 interface message, or mobile IP v 6 interface message.
7, the method for hometown agent message retransmission property in the raising mobile IP network according to claim 5 is characterized in that described step B comprises:
The home agent of B1, mobile node is intercepted and captured the message that communication node sends to mobile node on home network;
The route table items that mates in B2, the destination address information table of query and routing of home agent according to the message carrying, and according to banding cache or banding cache information index in the route table items of coupling, determine the banding cache information of the mobile node of the described message of reception, preserve the banding cache information of described mobile node in the described banding cache.
8, the method for hometown agent message retransmission property in the raising mobile IP network according to claim 7 is characterized in that described step B2 also comprises:
Determine that according to the outgoing interface information in the route table items of coupling or the flag bit of described outgoing interface information correspondence described message is the message that mails to mobile node.
9, the method for hometown agent message retransmission property in the raising mobile IP network according to claim 8 is characterized in that described step C comprises:
Utilize described banding cache information that the message that sends to mobile node is carried out encapsulation process;
Message after the encapsulation process is sent to the corresponding mobile node.
10, according to the method for hometown agent message retransmission property in claim 1,2, the 3 or 4 described raising mobile IP networks, it is characterized in that this method also comprises:
When the mobile node network of coming back to hometown, and when the home agent cancel register, the route table items of the banding cache information correspondence of the described and mobile node that from routing table, increases in the deletion registration process.
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| CNB2005100051841A CN100426790C (en) | 2005-02-01 | 2005-02-01 | Method for increasing hometown agent message retransmission property in mobile IP network |
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| CNB2005100051841A CN100426790C (en) | 2005-02-01 | 2005-02-01 | Method for increasing hometown agent message retransmission property in mobile IP network |
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| CN100426790C true CN100426790C (en) | 2008-10-15 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101399744B (en) * | 2007-09-27 | 2011-12-21 | 上海贝尔股份有限公司 | Mobile IPv4 data packet processing method, device and system thereof |
| CN100596242C (en) * | 2007-09-30 | 2010-03-24 | 华为技术有限公司 | Method, system and anchor point equipment for forwarding message |
| CN101483636B (en) * | 2008-01-11 | 2012-04-25 | 华为技术有限公司 | Method, system, customer terminal for mobile IP establishment, and anchor point management apparatus |
| CN101567839B (en) * | 2008-04-23 | 2012-06-20 | 华为技术有限公司 | Message transmitting method, hometown agent device, route device and system |
| US8625421B2 (en) * | 2012-02-03 | 2014-01-07 | Telefonaktiebolaget L M Ericsson (Publ) | DAD-NS triggered address resolution for DoS attack protection |
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| US6636498B1 (en) * | 1999-01-08 | 2003-10-21 | Cisco Technology, Inc. | Mobile IP mobile router |
| EP1030491A2 (en) * | 1999-01-27 | 2000-08-23 | Nortel Networks Corporation | System and method for route optimization in a wireless internet protocol network |
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Effective date of registration: 20170913 Address after: 274300, Shandong Province, Heze, Shanxian County Xu village, Ma Village, 60 village, No. Patentee after: Ma Deping Address before: 518129 Bantian HUAWEI headquarters office building, Longgang District, Guangdong, Shenzhen Patentee before: Huawei Technologies Co., Ltd. |
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