CN100469050C - Home agent, mobile router, and mobile communication method using the same - Google Patents
Home agent, mobile router, and mobile communication method using the same Download PDFInfo
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- 238000010295 mobile communication Methods 0.000 title abstract description 3
- 230000014509 gene expression Effects 0.000 claims description 22
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- 230000015572 biosynthetic process Effects 0.000 claims description 5
- 238000012360 testing method Methods 0.000 claims description 4
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- 230000009191 jumping Effects 0.000 description 12
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- H04W8/00—Network data management
- H04W8/02—Processing of mobility data, e.g. registration information at HLR [Home Location Register] or VLR [Visitor Location Register]; Transfer of mobility data, e.g. between HLR, VLR or external networks
- H04W8/06—Registration at serving network Location Register, VLR or user mobility server
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W80/00—Wireless network protocols or protocol adaptations to wireless operation
- H04W80/04—Network layer protocols, e.g. mobile IP [Internet Protocol]
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- H—ELECTRICITY
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Abstract
A mobile communication method includes: a step for transmitting a binding update message for notifying a destination network care-of-address to a home agent (102) from a mobile router (103) which can be used by moving the network; and a step performed upon reception of the binding update message, for notifying, by the home agent (102), route control information on the mobile network (105) managed by the mobile router (103) on the home network. Thus, the route control information from a mobile node (104) is notified to a gateway (101) and the router on the home network without delay after movement and it is possible to prevent data loss to the mobile node (104) belonging to the network after the movement.
Description
Technical field
The present invention relates to is being in the mobile communication system of purpose with the access with the internet, this mobile communicating method when mobile between other mobile radio communications of local network.
Background technology
Mobile IP is one of management method of mobile in the Internet system, and the mobile IPv 4 corresponding with IPv4 (Internet ProtocolVersion4) is standardized by RFC3220 (IP Mobility Support).In addition, with the corresponding mobile IP v 6 of IPv6 (Internet Protocol Version6), in internet design draft draft-ietf-mobileip-ipv6 (Mobility Support in IPv6), also carrying out standardization now.And by these agreements, terminal is under situation about moving between the different networks, and this portable terminal can use same address to communicate.
And then also research: by expanding this mobile IP protocol, with the mobile network of a local network integral body as Moving Unit, under situation about moving between the different networks, the node that belongs to this mobile network also can utilize same address to communicate.Make it become possible technology, now, in internet design draft draft-ietf-nemo-basic-support (Nemo Basic Support Protocol), carrying out standardization as NEMO.
Promptly, the mobile network who manages when the mobile router of supporting NEMO, leave that home network moves and when being connected to external network, the network information that mobile router sends according to the couple in router by the network that is connected to, obtain the prefix information of the network of current connection, be created on the Care-of Address that this network uses.Afterwards, mobile router sends to home agent with binding update messages.After home agent receives binding update messages from mobile router, generate or upgrade the home address of mobile router and deliver the binding cache entry that associates.
Then, when the grouping of mailing to the node that belongs to the mobile network, when the communication terminal from external network arrives the gateway that connects external network and home network, this gateway, as next hop router, specify the mobile router that has not moved to come to the home network relay for packets to the node that belongs to the mobile network.Therefore, acted on behalf of by home agent and to receive this by the grouping of relaying, home agent carries out transmitting to the Care-of Address of mobile router behind the package to this grouping.Mobile router carries out removing by the package of the grouping of home agent forwarding, takes out by the grouping gateway relaying, that mail to the node that belongs to the mobile network.Afterwards, mobile router sends to subordinate's mobile network with the grouping of this taking-up, and thus, the node that belongs to the mobile network just can receive grouping.
But, the mobile network leaves home network together with mobile router, thus, gateway just can not receive the Routing Protocol from mobile router, therefore be used under the situation that the routing table information to mobile network's grouping of Tandem Gateway is eliminated, just can not be from the grouping of gateway forwards to mobile router.Thus, the grouping of mailing to the node that belongs to the network that has moved has just disappeared.
Method as preventing that this grouping from disappearing has document 1 (Mobility Router Tunneling Protocol " draft-kniveton-mobrtr-03.txt ") and the described method of document 2 (Issues in Designing Mobility IPv6Network Mobility with the MR-HA Bi-directional Tunnel (MRHA), " draft-petrescu-nemo-mrha-02.txt ").In these existing methods, home agent receives Binding Update, sent as the binding response message of replying to it to mobile router after, receives the Routing Protocol that sends via the tunnel from mobile router.Afterwards, will be notified to gateway on the home network by the path control information that this Routing Protocol receives.
In the document 1, put down in writing mobile router and used dynamic routing protocol will be notified to the method for home agent about subordinate's mobile network's routing information.Thus, home agent as have via the router to mobile network's path of mobile router move.In addition, home agent upgrades routing table according to the routing information from the mobile router that has moved.And then home agent will be notified to home network based on the routing information of the routing table of having upgraded, thus, receive the gateway of this notice, will send to home agent to mobile network's grouping.
In document 2, put down in writing home agent do not use dynamic routing protocol, will be from the routing information that mails to the mobile network of mobile router pellucidly to the method for gateway relaying.Thus, look that from gateway as if mobile router and its subordinate's mobile network exist in home network.In addition, home agent does not upgrade routing table, catches as the grouping of having specified mobile router to next jumping of the node that belongs to the mobile network, sends to the node that belongs to the mobile network via the tunnel.
But in the existing mobile communicating method of in document 1, putting down in writing, after home agent receives binding update messages, path control information arrives gateway from home network and can produce time of delay, worries to lose to the meeting in group that belongs at mobile network's during this period node.In addition, because the reliability of communication path from mobile network to the home agent is low, also arrive the message of confirming in the Routing Protocol, can not guarantee that therefore path control information arrives home agent from the mobile router that has moved.Thus, when the path control information from initial mobile router is not sent to home agent, (common 30 seconds) path control information of new gateway more not till being sent out to next Routing Protocol to the mobile network, and disappear to the grouping of the node that belongs to the mobile network.
And then, in the existing mobile communicating method of in document 2, putting down in writing, except the path control information based on Routing Protocol of described low reliability communication path may disappear, in gateway,, always specify the address on the affiliated home network of this mobile network as to mobile network's packet forward destination (next jumping).For this reason, need home agent to catch its grouping that sends from gateway, the expense of producing has thus taken place.
Summary of the invention
Purpose of the present invention provides when the mobile network is mobile between other mobile radio communications, carries out the renewal of the address of mobile router immediately, and the mobile communicating method of the situation that the message of the node on the mobile network disappears does not take place.
Mobile communicating method of the present invention, may further comprise the steps: management sends the step of the binding update messages of the Care-of Address of notifying the mobile router that gets access in mobile destination with the mobile router of local network integral body as the mobile mobile network between network of a unit to home agent; When the angelica agency receives this binding update messages, the step of the path control information that notice is relevant with the mobile network that the mobile router on the home network is managed; And the node RX path control information on the home network, the step of carrying out path control according to this information.Thus, will be notified to gateway and router on the home network after moving without delay, and therefore can prevent to disappear to the data of the node that belongs to the network that has moved to mobile network's path control information.
In addition, mobile communicating method of the present invention, further comprising the steps of: home agent will represent to have notified the information of path control information to be notified to the step of mobile router; And when this mobile router does not receive information from home agent, mobile network's path control information is notified to the step of home agent by Routing Protocol.Thus, when the angelica agency receives binding update messages, even under the situation that does not have the function that path control information is notified to home network, mobile router also via tunnel notice Routing Protocol, therefore can be notified to home network with path control information.
In addition, in the path control information in mobile communicating method of the present invention, put down in writing the indication that the data forwarding that will mail to the mobile network is given home agent.Thus, home agent does not need to catch the data that mail to the mobile network that flow on home network, therefore can suppress the generation of expense.
Home agent of the present invention, comprise: from managing the mobile router of local network integral body as the mobile mobile network between network of a unit, be received in the Care-of Address that obtains in the mobile destination network, form the tunnel formation portion that sends to mobile network's data; According to binding update messages, generate the routing information generating unit of the path control information relevant with the mobile network who manages to the mobile router of home network notice from mobile router; Path control information is notified to the routing information sending part of home network; The generation expression has been carried out replying generating unit from the path of the response message of the notice of routing information sending part; The response message that this notice has been carried out in expression sends to the portion of replying of mobile router.Thus, home agent can receive the data that mail to the mobile router that has moved, and therefore can correctly transmit via the tunnel.And then home agent can correctly be passed on to mobile router and the path control information that receives has been notified to home network.
In addition, send in the path control information of home network, put down in writing the indication that the data forwarding that will mail to the mobile network is given home agent at home agent of the present invention.Thus, gateway on the angelica network or router receive when the data of the node that belongs to this network that has moved, be not the prefix that is transmitted to this mobile network, but be transmitted to home agent, so home agent can correctly send to the node that belongs to the mobile network with these data.
In addition, the routing information generating unit of home agent of the present invention, according to the path control information that generates the mobile network from the request of mobile router, indication routing information sending part sends.Thus, as long as home agent is according to notify mobile network's path control information just passable from the request of mobile router.
Mobile router of the present invention comprises: judge whether connecting destination network, the mobile test section that changes has taken place; When mobile test section detected the change that connects destination network, the binding update messages of the Care-of Address that notice is obtained in mobile destination network sent to the mobile notice portion of home agent; The mobile network's that the request home agent is managed mobile router path control information is notified to the routing information control request portion of home network.Thus, when when the mobile router change connects destination network, having moved, give home agent with the address notification of mobile destination, and, can use binding update messages request home agent that path control information is sent to home network.Therefore, when not to the replying of binding update messages, can ask once more, can pass on request to home agent reliably, simultaneously, can also notify home network by sending binding update messages once more.
In addition, mobile router of the present invention, only under the situation that just is connected to home network, in required time to the control information of home network transmit path, the data transfer path in the time of therefore can correctly controlling home network and connect.
In addition, the routing information sending part of mobile router of the present invention is when receiving the replying of the request of can not carrying out, have by Routing Protocol with mobile network's path control information and then be notified to the function of home agent from home agent.Thus, mobile router can detect do not have home agent receive binding update messages after, notice is to the occasion of the function of the path control information of home network, therefore mobile router can be notified home agent by Routing Protocol, path control information can also be notified to home network.
In addition, the routing information sending part of mobile router of the present invention has in the binding response message of inspection from home agent, whether comprises the expression home agent and carried out the function that routing information sends information requested.Thus, mobile router can detect home agent receive binding update messages after, do not carry out situation to the routing information notice of home network, therefore, mobile router can be notified home agent by Routing Protocol, also path control information can be notified to home network.
As mentioned above, by the present invention, when the mobile network was mobile between other mobile radio communications, the node on the home network carried out the change to mobile network's routing table immediately, thus, can prevent to disappear to mobile network's message.
Description of drawings
Fig. 1 is the deliver letters structure chart of system of the moving body in the embodiments of the present invention 1;
Fig. 2 A is the structure chart of data of the binding cache of the home agent in the embodiments of the present invention 1;
Fig. 2 B, C are the structure charts of data of the routing table of the home agent in the embodiments of the present invention;
Fig. 3 A, B are the structure charts of data of the routing table of the gateway in the embodiments of the present invention 1;
Fig. 4 is the block diagram of the structure of the home agent in the expression embodiments of the present invention 1;
Fig. 5 is the flow chart of the processing of the home agent in the expression embodiments of the present invention 1;
Fig. 6 is the block diagram of the structure of the mobile router in the expression embodiments of the present invention 1;
Fig. 7 is the flow chart of the processing of the mobile router in the expression embodiments of the present invention 1;
Fig. 8 is the precedence diagram of the mobile communicating method in the expression embodiments of the present invention 1;
Fig. 9 A is the structure chart of the data of the binding update messages in the embodiments of the present invention 1;
Fig. 9 B is the structure chart of the data of the binding acknowledgement message in the embodiments of the present invention 1;
Fig. 9 C is the structure chart of data that comprises the binding update messages of a plurality of mobile prefix options in the embodiments of the present invention 1;
Figure 10 is the structure chart of the data of the RIP in the embodiments of the present invention 1;
Figure 11 is the figure of structure that expression comprises the MNET (mobile network) of a plurality of network prefixs in the present embodiment 1;
Figure 12 is the figure of structure that expression comprises the MNET (mobile network) of a plurality of mobile routers in the present embodiment 2;
Figure 13 A is the structure chart of the data of the binding ultrahigh speed buffer in the present embodiment 2;
Figure 13 B, C, D are the structure charts of the data of the routing table in the present embodiment 2;
Figure 14 is the structure chart of the data of the binding update messages in the present embodiment 2.
Embodiment
Below, it is bright to utilize accompanying drawing to describe this law in detail.
(embodiment 1)
Fig. 1 is the structure chart of the mobile body communication system in the embodiments of the invention.
In Fig. 1, GW (gateway) the 101st is used for connecting the device of home network and external network (internet).HA (home agent) the 102nd, guarantees the device to this mobile network's packet communication when mobile at the moving of management mobile network.MR (mobile router) the 103rd, hold a plurality of LFN (local stationary nodes) 104 and network moved after still spendable router, support Routing Protocol (example is RIP).LFN (local stationary nodes) the 104th at the fixed terminal of MR103, and itself is provided with the mobility support function not necessarily to this terminal.MNET (mobile network) the 105th comprises the network of MR103 and LFN104, can use under the state that moves.Internet 106 is to comprise wireless electrical communication lines.AR (couple in router) the 107th is used for enter the Internet in mobile destination 106 router of MNET105.CN (communication object node) the 108th is connected to the communication terminal of external network.
Mobile body communication system to constituting as described above the following describes its action and effect.
Fig. 8 is the precedence diagram of the data forwarding action of expression MR103 when moving.
At first, MNET105 moves to external network from home network, and MR103 links to each other with AR107.Afterwards, MR103 generates Care-of Address from AR107 receiving router advertisement (step S801).
Then, MR103 as sending the destination, sends binding update messages (step S802) to AR107 with HA102.This message arrives HA102 (step S804) from AR107 via GW101 (step S803).
Afterwards, after HA102 receives binding update messages, generate entry at home address at oneself binding cache.
Fig. 2 A represents the structure of data of the binding cache of the HA107 in the present embodiment.In home address (Home Address) 201, logined the home address HoA1 of mobile node, logined the Care-of Address CoA1 that obtains from mobile destination network in the Care-of Address (Care of Address) 202, and, logined the prefix M-Prefix of the network of MR103 management in the prefix (Prefix) 203.
In addition, Fig. 9 A represents the structure of the data of binding update messages.In Fig. 9 A, M sign 901 is request HA102 sends signs from the path control information relevant with MR103 to home network.In addition, 903 storages of mobile prefix option are according to the prefix of the network that MR103 managed of binding update messages notice HA102 (M-Prefix).
In addition, HA102 checks whether be provided with this M sign 901 at this moment, when being provided with, utilizes Routing Protocols such as RIP or OSPF, the path control information (step S805) of the network of being managed to home network multicast MR103.Figure 10 represents the data structure by the path control information of RIP transmission.In Figure 10, be provided with the link local address of HA102 in the source address (SourceAddess) 1001, be provided with M-Prefix among the IPv6Prefix1002.
Afterwards, HA102 sends to MR103 after the M sign 902 that notice sent to path control information home network is set in the binding acknowledgement message that Fig. 9 B represents, notice has received Binding Update (step S806 is to step S808).
On the other hand, GW101 receives the path control information from HA102, upgrades the routing table of oneself.
Fig. 3 A, B represent the routing table of the GW101 in the present embodiment.Fig. 3 A is the routing table before the moving of MNET105, and Fig. 3 B is the routing table after moving.
In Fig. 3 A, destination (Destination) 301 expressions send destination network, and next next jumping (Nexthop) 302 expressions transmit the transmission destination-address of grouping, and IF303 represents network interface.
Before MNET105 moves, logined M-Prefix in the destination in the routing table of GW101 (Destination) 301, logined the link local address LL_MR of MR103 in next jumping (Next hop) 302, in IF303, logined if2 as the network interface of the home link side of GW101.But, after MNET105 moves, receive path announcement information from HA102, shown in Fig. 3 B, next jumping (Next hop) 304 is changed to the link local address LL_HA of HA102.
Thus, MNET105 move the back arrive GW101 (step S809), to the grouping of MNET105, be forwarded to next jumping home agent LL_HA (step S810) that Fig. 3 B represents, receive the HA102 of grouping, the use tunnel path is transmitted to the MR103 (step S811 is to step S814) after moving.
As mentioned above, in the moment that according to binding update messages the routing information of MR103 is notified to HA102 by MR103, owing to notify the GW101 of home network without delay, compare with existing method, can accomplish almost not disappear to the grouping of MR103 from GW101.In addition, when MR103 does not receive binding acknowledgement message, send binding update messages to HA102 once more, thus, even under the situation that has moved to the low network environment of reliability, also can reliably path control information be notified to home network.
Below, structure and the action of MA103 in the present embodiment and HA102 described.
Fig. 6 is the block diagram of the structure of expression MR103.
In Fig. 6, L1/L2 handling part 601,603 carries out the communication process of physical layer and data link layer, L3 handling part 602 carries out the IP protocol processes of network layer, and mobile IP handling part 604 carries out the mobile management of MR103 in proper order according to mobile IP, has the function of the mobile notice portion that the present invention relates to.Information or home address that 605 storages of home agent storage part are relevant with home agent or home domain network.In addition, RIP sends judging part 606 and judges whether to send path control information based on Routing Protocol, the routing information sending part that is equivalent to the present invention relates to.Mobile network's handling part 607, control is to the notice of home agent delegation path control information, the routing information control request portion that is equivalent to the present invention relates to.
Below, the action of the MR103 that as above constitutes is described.
Fig. 7 is the processing sequence that MR103 implements.
At first, mobile IP handling part is via the reception (step S700) of L1/L2 handling part 601 and the 602 check groupings of L3 handling part, when receiving, whether the data that receive of check are the router advertisements (being designated as " RA " in Fig. 7) (step S701) from the AR107 of external network.
When being router advertisement, mobile IP handling part 604 obtains the prefix information of the link of current connection from this network information.According to this information, check current connection network whether be stored in the home agent storage part 605, the home network (step S702) of oneself, when being when being present in home network, get back to step S700.
Then, when identifying when not being to be present in home network, mobile IP handling part 604 is notified mobile network's handling part 607, mobile network's handling part 607 is provided with the M sign 901 and the mobile prefix option 903 (step S703) of the binding update messages of Fig. 9 (a) expression, simultaneously, be created on the Care-of Address (step S704) that uses in this link, generate binding update messages (step S705).
In addition, M sign 901 and mobile prefix option 903 among the step S703 not necessarily must be set in the transmission of all binding update messages.
Afterwards, mobile network's handling part 607 indicates mobile IP handling part 604 to send this binding update messages.Mobile IP handling part 604 as the transmission destination, sends this binding update messages (step S706) to AR107 with the address of the home agent that is stored in home network in the home agent storage part 605, that management is own.At this moment, mobile IP handling part 604 begins to be used for to check the timing of timer of the reception of binding acknowledgement message.Get back to step S700 then.
When the data that receive at step S701 were not route advertisement, mobile IP handling part 604 judged to be binding acknowledgement message (step S707).When being binding acknowledgement message, whether be provided with M sign 901 (step S717) in the binding update messages that 607 checks of mobile network's handling part had before been sent, if be not provided with, then get back to step S700.
When being provided with M in the binding update messages of formerly sending and indicating 901, whether check is provided with M sign 901 (step S708) in the binding acknowledgement message that receives, if be provided with, then get back to step S700.
When M not being set indicating 902, it is not the home agent that the present invention relates to that mobile network's handling part 607 is judged as HA102, and notice RIP sends judging part 606.RIP sends judging part 606, indicates mobile IP handling part 604 to pass through the control information of RIP transmit path via the tunnel, and mobile IP handling part 604 sends to tunnel (step S709) with RIP.Afterwards, get back to step S700.
When neither binding acknowledgement message in step S707, the grouping (step S710) whether the grouping that check receives mails to M-Prefix be when not being when mailing to the grouping of M-Prefix, gets back to step S700.
If mail to the grouping of M-Prefix, then send and receive grouping (step S711) to fixed terminal LFN104.Get back to step S700 then.
When not receiving grouping in step S700, whether mobile IP handling part 604 checks have passed through the stipulated time (step S712) after sending binding update messages, when having passed through the stipulated time, binding update messages is resend HA102 (step S713).
In addition, when not passing through the stipulated time, RIP sends judging part 606 according to judging that from the notice of mobile IP handling part 604 whether current position is in home network (step S714), when not being in home network, gets back to step S700.On the other hand, when being in home network, whether check has passed through stipulated time 30 seconds (step S715).
If, then get back to step S700,, then send RIP (step S716) to the home network multicast via L1/L2 handling part 51 and L3 handling part 52 if passed through not through 30 seconds.Get back to step S700 afterwards.
Like this, if present connection network is a home network, then MR103 is by HA102, the GW101 of RIP on home network, the current address of other router multicasts not shown in the figures, and notice connects, but when the time not at home network, M sign 901 is set in binding update messages, entrusts home agent that RIP is sent to home network.Thus, the frequency that transmits RIP to external network can be reduced, the traffic of network can be reduced.
In addition, even passed through the stipulated time when also not receiving binding acknowledgement message after MR103 sends to home agent with binding update messages, owing to resend binding update messages, the transmission that therefore can be reliably transmits RIP to home agent is entrusted.
And then MR103 is also according to being provided with M sign 902 in the binding acknowledgement message, can detect home agent and not receive to home network request RIP and send.Thus, MR103 can be notified to home agent by RIP with path control information via the tunnel at this moment.
Below, structure and the action of HA102 described.
Fig. 4 is the block diagram of the structure of expression HA102.In Fig. 4, L1/L2 handling part 402 carries out physical layer process and data link layer deals, L3 handling part 402 carries out network layer handles such as IP agreement, routing information generating unit 406 is according to the binding update messages generation pass control information that receives, and the path is replied generating unit 407 and generated the information that the expression path control information is sent to home network.Upper strata handling part 403 carries out upper layer such as TCP or UDP to be handled, and mobile IP handling part 404 carries out mobile network's mobile management, has routing information sending part, the tunnel formation portion that the present invention relates to and replys portion.This routing information sending part sends each information according to the indication of replying generating unit 407 from routing information generating unit 406 or path, tunnel formation portion form and mobile router between the tunnel, the portion of replying sends binding acknowledgement message.
In addition, use the control that handling part 405 is used.
Below the action of the HA102 of formation is as described above described.
Fig. 5 is the processing sequence that HA102 implements.
At first, the grouping that mobile IP handling part 404 checks receive via L1/L2 handling part 401 and L3 handling part 402 is RIP (step S501), when being RIP, upgrades routing table (step S502) according to this path control information.
When MR103 belonged to home network, HA102 received the RIP from MR103, shown in Fig. 2 B, upgraded routing table.That is, in destination (Destination) 204, login M-Prefix, the link local address LL_MR of login MR103 in next jumping (Next hop) 205, the network interface if1 of login HA102 in IF303.
On the other hand, when the grouping that receives was not RIP, the reception (step S503) of mobile IP handling part 404 check binding update messages when receiving, was bound the renewal of cache and is handled (step S504).
In the renewal of this binding cache, carry out following processing.
When having entry in the binding cache that HA102 managed, upgrade its content, when not having entry, utilize the information that is included in the binding update messages to generate new entry.When MR103 is connected to external network, receive this binding update messages, utilization is documented in home address HoA1 wherein, for example MR103 or Care-of Address CoA1 or prefix M-Prefix etc., generates the binding cache entry shown in Fig. 2 A.And then, mobile IP handling part 404, and MR103 between set twocouese IP tunnel tn1, in addition, shown in Fig. 2 C, next jumping (Next hop) 207 of routing table is changed to Care-of Address CoA1, network interface IF208 is updated to tunnel tn1.
Then, mobile IP handling part 404, whether check is provided with M sign 901 (the step S505) of the binding update messages that receives.
When not being provided with, move to step S510, when being provided with, send the RIP (step S506) that Figure 10 of the path control information put down in writing MNET105 represents.Thus, receive the router or the GW101 of this path control information, shown in Fig. 3 B, link local address LL-HA that HA102 is set is as next jumping 304 to MR103.
Afterwards, mobile IP handling part 404 sends the binding acknowledgement message (step S507) that comprises the success or not of binding the cache renewal via L3 handling part 402 and L1/L2 handling part 401 to MR103.When sent RIP according to the M of binding update messages sign 901 this moment in step S506, the M sign 902 of the binding acknowledgement message that sends for path control information is sent to MR103 is set.
In addition, in the processing of step S503, when the grouping that receives was not binding update messages, mobile IP handling part 404 judged whether the grouping that receives has been registered in the grouping of mailing to the mobile network (step S508) in the binding cache.When unregistered, after IP the package that to use listed Care-of Address CoA1 be the destination receives grouping, send (step S509) via L3 handling part 402 and L1/L2 handling part 401.
In addition, when not having entry, mobile IP handling part 404 is judged the grouping of mailing to the mobile network (step S510) that whether has been registered in routing table.
When in the routing table entry being arranged, mobile IP handling part 404 sends reception grouping (step S511) according to routing table.When MNET105 moved to external network, according to the routing table that Fig. 2 C represents, the grouping of mailing to M-Prefix was jumped CoA1 to next, delivers to tunnel tn1.
On the other hand, when not having entry in the routing table, do not handle at mobile IP handling part 404, L3 handling part 402 carries out common IP layer and handles (step S512).Afterwards, get back to step S501.
As mentioned above, the HA102 that the present invention relates to checks the M sign 901 in the binding update messages that is received by MR103, thus, by GW101 on the RIP notice home network or router not shown in the figures, so that mail to the link local address LL_HA that the transmission destination of the grouping of M-Prefix is exactly HA102, therefore can receive the grouping of mailing to M-Prefix from GW101 on the home network or router not shown in the figures.In addition, HA102 does not need to catch on the home network grouping of flowing like this, just can suppress for this reason and the expense that produces.
In addition, in the present embodiment as shown in Figure 1, made MNET (mobile network) 105 disposed a network prefix M-Prefix the subordinate of MR 103 structure, and shown in the MNET105 of Figure 11, also can dispose a plurality of network prefixs such as M-Prefix1, M-Prefix2 the subordinate of MR103.
At this moment, obtained the MR103 of Care-of Address the mobile network, according to the flow chart that Fig. 7 represents HA102 transmission nation is decided updating message, but when network prefix M-Prefix is set in step S717, as the mobility option in the Binding Update option 905, the mobile prefix option 903 of an additional demand, thus, can send all network prefix M-Prefix that is managed.
And then, receive the HA102 of the binding update messages that comprises a plurality of mobile prefix options, generate the RIP message of the IPv6Prefix102 of the Figure 10 that has only appended necessary M-Prefix quantity, and send to home link, thus, the grouping of mailing to a plurality of M-Prefix can be received, MR103 can be transmitted to.
In addition, use the M sign in the present embodiment, but be not limited to this, in the time can confirming that home agent is exactly home agent of the present invention, do not use M sign, mobile router as before, as long as it is just passable binding update messages to be sent to when mobile home agent.At this moment, home agent check binding cache is being identified as the moment that does not belong to home network, by gateway or the router on the RIP notice home network.
In addition, GW101 does not have the place different with common GW yet in the embodiment that the present invention relates to, and according to upgrading routing table by the path control information of RIP notice, the grouping that receives is transmitted according to this routing table.
In addition, in the notice of path control information, use RIP in the present embodiment, but be to use other Routing Protocols such as OSPF also can obtain same effect.
(embodiment 2)
Figure 12 is the block diagram of the structure of the MNET that relates to of expression present embodiment.As shown in figure 12, a network prefix M-Prefix is disposed a plurality of MR1 (1201), MR2 (1202), managed MNET1205.
In the mobile body communication system that Fig. 1 represents, the action of the forwarding data when below the MNET1205 that replaces MNET105, present embodiment to relate to having been moved describes.
At this moment, at first, MR1 (1201) is connected to network in mobile destination, in case obtained Care-of Address CoA1 from AR107, according to binding update messages, CoA1 and the network prefix M-Prefix that obtains is notified to HA102.
Receive the flow chart processing messages that the HA102 of binding update messages represents according to Fig. 5 similarly to Example 1, set twocouese IP tunnel tn1.And, also set binding cache (Fig. 2 A) and routing table (Fig. 2 C).
Then, when MR2 (1202) when mobile destination is connected to network and obtained Care-of Address CoA2, according to binding update messages CoA2 and the network prefix M-Prefix that obtains is notified to HA102.
Receive the flow chart processing messages that the HA102 of binding update messages represents according to Fig. 5 similarly to Example 1, set twocouese IP tunnel tn2.And, also set binding cache (Figure 13 A) and routing table (Figure 13 B).
In routing table (Figure 13 B), same destination M-Prefix has been generated two entrys, therefore introduce new default router 209.Whether inspection has set M sign 901 from the binding update messages that MR2 (1202) receives, when not setting, as Figure 13 B 210 shown in, already present next default router of jumping to the entry of CoA1 in the routing table is set at 1.In addition, when having set M when sign, as Figure 13 C 211 shown in, the default router that next that will append according to corresponding binding update messages jumped to the entry of CoA2 is set at 1.
And then, when HA102 receives to the grouping of M-Prefix forwarding, when transmitting according to routing table, in routing table, exist under the situation of entry of a plurality of destination M-Prefix, carry out packet forward after selecting to be set at 1 next jumping and IF with reference to the default router hurdle in the entry.Thus, under the situation that has a plurality of routing table entrys about MNET1205, also can judge to use which entry, can carry out packet forward.
And then, even in the binding update messages that does not use M sign, MR1 (1201) and MR2 (1202) to send, as shown in figure 14, set priority options 904, can the relative importance value of each mobile router be notified to HA102 according to priority option 904 at Binding Update option 905.
Receive the HA102 of the binding update messages of band priority option 904, shown in Figure 13 D, set relative importance value hurdle 212, store the relative importance value of each mobile router in routing table.
And then, HA102 receives the grouping of transmitting to M-Prefix, when transmitting according to routing table, exists in routing table under the situation of entry of a plurality of destination M-Prefix, with reference to the relative importance value hurdle in the entry, carry out packet forward behind next jumping of the entry that the selection relative importance value is high and the IF.Thus, even under the situation of the routing table entry that has a plurality of relevant MNET1205, also can judge to use which entry, can carry out packet forward.
As mentioned above, according to present embodiment, when the MNET1205 that a network prefix M-Prefix has been disposed a plurality of MR1 (1201), MR2 (1202) has moved, HA also changes mobile network's routing table immediately, transmit grouping to the entry that is fit to, therefore, can prevent to disappear to the message of the node that belongs to the mobile network.
The present invention is suitable for not changing the address of node that belongs to the mobile network and sends the communication between the mobile network who moves between the network is useful as a unit with local network integral body.
Claims (14)
1. a mobile communicating method is characterized in that,
May further comprise the steps:
Management is moved local network integral body as a unit, between network mobile network's mobile router, the Care-of Address of the mobile router that transmission will have been obtained in mobile destination is notified to the step of the binding update messages of home agent;
Described home agent, in the moment that receives described binding update messages, the step of the path control information that the node notice on home network is relevant with the mobile network of described mobile router management; With
Described node on the described home network receives described path control information, and carries out the step of path control according to this path control information.
2. mobile communicating method according to claim 1 is characterized in that,
Further comprising the steps of:
Described home agent will represent to have notified the information of described path control information to be notified to the step of described mobile router; With
When described mobile router does not receive when having notified the information of described path control information from the expression of described home agent,,, be notified to the step of described home agent with the path control information relevant with described mobile network by Routing Protocol.
3. mobile communicating method according to claim 1 is characterized in that,
In described path control information, record the indication of giving described home agent with the data forwarding that mails to described mobile network.
4. mobile communicating method according to claim 2 is characterized in that,
In described path control information, record the indication of giving described home agent with the data forwarding that mails to described mobile network.
5. a home agent is characterized in that,
Comprise:
Tunnel formation portion, it moves local network integral body from management as a unit, between network mobile network's mobile router is received in the Care-of Address that mobile destination network gets access to, and forms the tunnel that sends data to the mobile network;
The routing information generating unit; It is by the binding update messages from described Care-of Address described mobile router, that comprise described mobile router, generates the relevant path control information of the mobile network notice home network, that manage with described mobile router;
The routing information sending part, it is notified to described home network with described path control information;
Generating unit is replied in the path, and the response message from the notice of described routing information sending part has been carried out in its generation expression; With
Reply portion, it sends to described mobile router with described response message.
6. home agent according to claim 5 is characterized in that,
In described path control information, record the indication of giving described home agent with the data forwarding that mails to described mobile network.
7. home agent according to claim 5 is characterized in that,
Described routing information generating unit according to the request from described mobile router, generates described mobile network's path control information, indicates described routing information sending part to send.
8. home agent according to claim 6 is characterized in that,
Described routing information generating unit according to the request from described mobile router, generates described mobile network's path control information, indicates described routing information sending part to send.
9. a mobile router is characterized in that,
Comprise:
Mobile test section, it judges whether connecting destination network, variation has taken place;
Mobile notice portion, when it detected the change that connects destination network when described mobile test section, the binding update messages of the Care-of Address that notice is got access in connecting destination network sent to home agent; With
Routing information control request portion, it asks described home agent, and the path control information with the mobile network of this mobile router management is notified to home network.
10. mobile router according to claim 9 is characterized in that,
Also comprise the routing information sending part, its under the situation that just is connected to home network, per stipulated time to the control information of home network transmit path.
11. mobile router according to claim 9 is characterized in that,
When described routing information sending part receives can not carry out from the replying of the described request of described routing information control request portion the time from described home agent, by Routing Protocol, further the path control information with described mobile network is notified to described home agent.
12. mobile router according to claim 10 is characterized in that,
When described routing information sending part receives can not carry out from the replying of the described request of described routing information control request portion the time from described home agent, by Routing Protocol, further the path control information with described mobile network is notified to described home agent.
13. mobile router according to claim 9 is characterized in that,
When described routing information sending part does not receive expression when having carried out information from the described request of described routing information control request portion from described home agent, by Routing Protocol, further the path control information with described mobile network is notified to described home agent.
14. mobile router according to claim 10 is characterized in that,
When described routing information sending part does not receive expression when having carried out information from the described request of described routing information control request portion from described home agent, by Routing Protocol, further the path control information with described mobile network is notified to described home agent.
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| CN101119393A (en) * | 2006-08-02 | 2008-02-06 | 华为技术有限公司 | Method, system and mobile node for updating categorizer |
| CN102572828B (en) * | 2010-12-08 | 2015-04-01 | 中国电信股份有限公司 | Method, device and system for supporting mobile type IP (internet protocol) sub-network access and management |
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