CN101674619B - Switching method, active node and switching system - Google Patents
Switching method, active node and switching system Download PDFInfo
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- CN101674619B CN101674619B CN200910206704.3A CN200910206704A CN101674619B CN 101674619 B CN101674619 B CN 101674619B CN 200910206704 A CN200910206704 A CN 200910206704A CN 101674619 B CN101674619 B CN 101674619B
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Abstract
The invention discloses a switching method, an active node and a switching system, relates to the data communication field, and solves the problem of low reliability of data transmission in the switching process of mobile host computers. The method comprises the following steps: determining to receive a binding update message which carries a new care-of address obtained after MN switching and a list of communication nodes of MN; enquiring local routing information according to the list of communication nodes, and determining to forward a policy and the communication nodes of the binding update message; and forwarding the binding update message to the corresponding communication nodes according to policy of the binding update message. The technical proposal is applicable to networks using mobile IP technology.
Description
Technical field
The present invention relates to data communication field, particularly relate to a kind of changing method, active node and switched system.
Background technology
In recent years along with the use of high-performance portable computer and the fast development of wireless technology, increasing user brings into use wireless access Internet.The combination of radio communication and Internet defines mobile Internet.Mobile IP technology has become the inexorable trend that mobile Internet develops.
When mobile host (Mobile Node, MN) at home network time, the main frame that its working method is as fixing in co-located, Mobile IP does not need to carry out any special operation.When MN leave home network enter field network time, by the IPv6 stateless of routine or the automatic configuration mechanism having state, obtain one or more Care-of Address.
In the process that example uses mobile IP technology to manage MN, there are the following problems:
Easily there is packet loss doing in cross-domain moving process in MN, and then have impact on ongoing communication, and when MN is cross-domain, the reliability of transfer of data is low.
Summary of the invention
The invention provides a kind of changing method, active node and switched system, solve the problem that in mobile host handoff procedure, data transmission credibility is low.
A kind of changing method, comprising:
Determine to receive Binding Update message, in described Binding Update message, carry the Correspondent Node list of new Care-of Address and this MN obtained after mobile host switches;
According to described Correspondent Node list, inquiry local routing information, determines the strategy and the Correspondent Node that forward described Binding Update message;
According to the strategy of described forwarding Binding Update message, forward described Binding Update message to corresponding Correspondent Node.
Further, described determine to receive the step of Binding Update message before, also comprise:
Notice message is shifted out in reception, described in shift out notice message and indicate described MN to switch, described in shift out in notice message and carry the Correspondent Node list of this MN;
According to described Correspondent Node list, inquiry local routing information, determines the strategy and the Correspondent Node that shift out notice message described in forwarding;
Shift out the strategy of notice message according to described forwarding, described in forwarding to corresponding Correspondent Node, shift out notice message.
Further, described determine to receive the step of Binding Update message before, also comprise:
After shifting out notice message described in receiving, for described MN creates packet buffer district;
When receiving the message sent to described MN, by this packet buffer in the packet buffer district of this MN.
Further, described changing method also comprises:
When described packet buffer district is full, notice upstream node continues to store the message sent to described MN.
Further, the described strategy according to described forwarding Binding Update message, after corresponding Correspondent Node forwards the step of described Binding Update message, also comprises:
According to the new Care-of Address of described MN, send the message in the packet buffer district of this MN to described MN.
Further, describedly determine that receiving Binding Update message is specially:
Receive message, check MH Type (mobile node head type) field of this message header;
If MH the type field is 5, then think that described message is Binding Update message.
Further, described changing method also comprises:
If do not have Correspondent Node information in the Correspondent Node list of described MN, then the home agent to described MN sends described binding update messages.
A kind of active node, comprising:
Message receiver module, receives Binding Update message for determining, carries the Correspondent Node list of new Care-of Address and this MN obtained after MN switches in described Binding Update message;
Forwarding strategy determination module, for according to described Correspondent Node list, inquires about local routing information, determines the strategy and the Correspondent Node that forward described Binding Update message;
Packet forwarding module, for the strategy according to described forwarding Binding Update message, forwards described Binding Update message to corresponding Correspondent Node.
Further, described message receiver module, also shifts out notice message for receiving, described in shift out notice message and indicate described MN to switch, described in shift out in notice message and carry the Correspondent Node list of this MN;
Described forwarding strategy determination module, also for according to described Correspondent Node list, inquires about local routing information, determines the strategy and the Correspondent Node that shift out notice message described in forwarding;
Described packet forwarding module, also for shifting out the strategy of notice message according to described forwarding, shifts out notice message described in forwarding to corresponding Correspondent Node.
Further, described active node, also comprises:
Cache module, for after shifting out notice message described in receiving, for described MN creates packet buffer district, and when receiving the message sent to described MN, by this packet buffer in the packet buffer district of this MN;
Described packet forwarding module, also for after described message receiver module receives described Binding Update message, according to the new Care-of Address of described MN, sends the message in the packet buffer district of this MN to described MN.
A kind of switched system, comprise the old access node of active node, MN and described MN, described active node is the superior node of described old access node;
Described active node, Binding Update message is received for determining, the Correspondent Node list of new Care-of Address and this MN obtained after MN switches is carried in described Binding Update message, according to described Correspondent Node list, inquiry local routing information, determine the strategy and the Correspondent Node that forward described Binding Update message, according to the strategy of described forwarding Binding Update message, forward described Binding Update message to corresponding Correspondent Node;
Described MN, for to switch and after getting new Care-of Address, send described Binding Update message by described old access node to described active node, in described Binding Update message, carry the Correspondent Node list of new Care-of Address and this MN obtained after MN switches.
Further, described active node, also shift out notice message for receiving, the described notice message that shifts out indicates described MN to switch, described in shift out in notice message and carry the Correspondent Node list of this MN, according to described Correspondent Node list, inquiry local routing information, determine the strategy and the Correspondent Node that shift out notice message described in forwarding, shift out the strategy of notice message according to described forwarding, described in forwarding to corresponding Correspondent Node, shift out notice message;
Described MN, also for when shifting out from described old access node, shifts out notice message by described old access node to described active node transmission.
Further, described active node, also for after shifting out notice message described in receiving, for described MN creates packet buffer district, when receiving the message sent to described MN, by this packet buffer in the packet buffer district of this MN, and after receiving described Binding Update message, according to the new Care-of Address of described MN, send the message in the packet buffer district of this MN to described MN.
The embodiment provides a kind of changing method, active node and switched system, when MN switches, by specific message, as Binding Update message, the new Care-of Address obtained after this MN of active node switching that notice is corresponding and the Correspondent Node list of this MN, forward Binding Update message by active node to corresponding Correspondent Node, realize the synchronous of MN handover information, achieve transfer of data when MN under high reliability is cross-domain to be switched; And when MN initially switches, send to active node and shift out notification message, determine new Care-of Address after shifting out before, the message sent to this MN by active node buffer memory, further increases the reliability of transfer of data in handoff procedure.
Accompanying drawing explanation
Fig. 1 is the structural representation of the network environment of embodiments of the invention application;
The flow chart of a kind of changing method that Fig. 2 provides for embodiments of the invention;
The structural representation of a kind of active node that Fig. 3 provides for embodiments of the invention;
The structural representation of a kind of active node that Fig. 4 provides for another embodiment of the present invention;
The structural representation of a kind of switched system that Fig. 5 provides for embodiments of the invention.
Embodiment
MN needs to apply for new Care-of Address to the territory switched to doing in cross-domain moving process, in the process of application Care-of Address, easily there is packet loss in the data that Correspondent Node sends to this MN, and then have impact on ongoing communication, and when MN is cross-domain, the reliability of transfer of data is low.In order to solve in mobile IP network, the problem that time cross-domain, the reliability of transfer of data is low, The embodiment provides a kind of changing method, by Active Networks process switching flow, improves network reliability.
In order to the technical scheme that embodiments of the invention provide better is described, first Active Networks is introduced.
Active Networks concept is that this novel network architecture is put into more computing task in some specific network nodes in recent years for drawback and the not enough a kind of novel network architecture proposed of legacy network.
Active node in Active Networks has the computational higher than conventional node, and it can carry out self-defined process to the packet flowing through this section point.Active Networks originates from " pushing away (push) " and " drawing (pull) " two kinds of technology.The mode that " pull " Technology origin is driven by user on fire compartment wall, WEB agency, multicast router, mobile agent, video gateway and nodes similar with it.These modes have obtained certain application in traditional network." push " technology is the outstanding embodiment of Active Networks, and it makes active network technology further be developed.
Active Networks is for legacy network, and legacy network, owing to not processing message data or calculating, is therefore referred to as passive network.In a lot, Active Networks is compared with legacy network, more meets the trend of network Development, and the difference of Active Networks and legacy network is as follows:
1, Internet Transmission pattern: Active Networks adopts the transmission mode of storage-calculating-forwarding.Active node not only has the ability of packet transaction route, and can carry out computing to the content of grouping, makes grouping can be modified in transmitting procedure, store and be redirected, and advises for the forwarding or process further of grouping.And legacy network adopts the transmission mode of Store and forword end to end.Information is at the enterprising row relax of the terminal of network, although network node can change the header of grouping, but real user data is not processed, even change header and the relevant route of process also independent of user and application, the content in the routing mode that is divided into groups and concrete message is irrelevant;
2, network adaptability: in Active Networks, can intercourse the code of program between node, improve the adaptability of procotol by this mode; Meanwhile, user also can also perform within network nodes according to the needs custom program of oneself, this mode makes new application and service complete process from being contemplated that realization faster, and then be used in practice, and in traditional network architecture, the development progress of new agreement is slowly;
3, network flexibility: compared with traditional network, Active Networks has stronger flexibility.Active Networks better can coordinate the mutual or concurrent working between distinct device in a distributed system, thus effectively can avoid Single Point of Faliure, and effectively can shorten the process of user and the propagation delay time of grouping.The link of redundancy better can also be utilized to carry out the transmission of data at Active Networks, thus reduce network congestion, increase the current performance of network and the predictability of network.
The embodiment provides a kind of changing method, in network configuration as shown in Figure 1, use the method to complete the flow process of switching as shown in Figure 2, comprising:
Step 201, MN are shifted out by old access node (OAR), send shift out notice message to active node;
In this step, when MN shifts out from old access node, the Active Routers AR2 in territory, old access node place sends a message to the Active Routers AR3 of upper level active node, and notice MN shifts out territory, old access node place, and this message is specially and shifts out notice message.
AR3 is the even higher level of node of AR2, in the network configuration shown in Fig. 1, in tree between each node.
What step 202, active node reception MN sent shifts out notice message;
Just be connected into network in active node or carried out initial work when restarting, having completed self configuration, Getting Network Topology Information, the interpolation of active functions module.After initialization completes, active node opens the arrival of interface outstanding message bag.After having message to arrive, active node judges whether self allows reactiver outing function, if node is not allowed to carry out reactiver outing, then carries out common process to IP packet, and IP message load mode traditionally forwards.If node allows to carry out reactiver outing, then active packet handling process is carried out to packet.
In this step, what AR3 reception MN sent via AR2 shifts out notice message, and this shifts out the Correspondent Node list of carrying this MN in notice message, comprises the number and address that carry out the Correspondent Node (CN) communicated with this MN in list.
Step 203, active node are according to described Correspondent Node list, and inquiry local routing information, determines the strategy and the Correspondent Node that shift out notice message described in forwarding;
In this step, AR3 scanning is shifted out the Correspondent Node list in notice message and is compared with the routing iinformation (as node route list) of self, draws the number of copies (the corresponding message of each Correspondent Node) and routing direction that shift out notice message.
To each CN, the active node routing table of Grouping scan self, the number that message copies is determined by the contrast of the active node address in CN address and routing table, if the active node that two CN are corresponding identical, then only copy a message, and destination address original in message is stored in the former destination address field (DAF) in the active packet head shifting out notice message, the address of object active node is put into the destination address field (DAF) of IP message.
Step 204, active node shift out the strategy of notice message according to described forwarding, shift out notice message described in forwarding to corresponding Correspondent Node;
In this step, according to the forwarding strategy that CR3 in step 203 obtains, be specially because CN1 and AR4 is in same path, CN2, CN3 and AR5 are in same path, therefore AR3 copies a message issues AR4, former message sends to AR5, forwards the packet to each Correspondent Node of MN.
Equally, AR4 and AR5 adopts step 202 and the method described in step 203 to forward moving notification message, and the notice message that shifts out finally issuing AR4 is received by CN1 through AR6 and AR9.AR5 copies portion and shifts out notice message and be distributed to AR7, and former message is sent to AR8, finally shifts out and notify that message is received by CN2 and CN3.
Shifting out from old access node as MN but do not obtain new Care-of Address (NCoA) period, send to the message of MN to carry out buffer memory by the Active Routers of message on path, concrete steps are as follows:
Step 205, active node, after shifting out notice message described in receiving, for described MN creates packet buffer district, will send to the packet buffer of this MN in this packet buffer district;
In this step, each receives the node shifting out notice message, and as AR1 ~ AR11, detect the MN mark shifted out in notice message, in this locality, MN creates packet buffer district and starts active packet caching function for this reason.
Send to the packet buffer of MN in the packet buffer district of this locality CN1 for AR3, AR3, when AR3 buffer area is full, AR3 sends message informing AR4 continuation stored messages, sends the message of message informing AR6 to follow-up arrival and store when AR4 buffer area is full.
After MN obtains new Care-of Address, need the Care-of Address notifying that each Correspondent Node is new, and obtain the message be buffered in handoff procedure in each node, detailed process is as follows:
Step 206, active node are determined to receive Binding Update message, carry the Correspondent Node list of new Care-of Address and this MN obtained after MN switches in described Binding Update message;
In this step, after MN obtains new Care-of Address, send Binding Update message via AR2 to AR3, by AR3 this binding message sent to the node on each Correspondent Node and path, detailed process is see step 203.
Active node determines that the message received is that Binding Update message can check that its MH Type (mobile_node header Type) field realizes for the Mobile IP header by obtaining IP message, specifically by judging whether MH the type field equals 5, MH the type field equals 5, illustrate current processing for binding update messages message; Otherwise then traditionally IP message processes.If the message processed is binding update messages message, then obtains active packet head, in active packet head, have the list of MN Correspondent Node.
Step 207, active node, according to the strategy of described forwarding Binding Update message, forward described Binding Update message to corresponding Correspondent Node;
In this step, the forwarding strategy that MN determines according to step 206, forwards Binding Update message, see step 204 to each Correspondent Node.
Especially, when the number of CN is 0 in Correspondent Node list, represents this Binding Update message and only send to home agent, now active node starts the forwarding that traditional IP Message processing pattern carries out message; If CN number is not 0, then carry out the transmission of Binding Update message according to multicast or multicast protocol.
Step 208, active node, according to the new Care-of Address of described MN, send the message in the packet buffer district of this MN to described MN;
In this step, when AR3 receives the binding update messages of MN, the message in packet buffer district is issued the new Care-of Address of MN by AR3.
The embodiment provides a kind of changing method, when MN switches, by specific message, as Binding Update message, the new Care-of Address obtained after this MN of active node switching that notice is corresponding and the Correspondent Node list of this MN, forward Binding Update message by active node to corresponding Correspondent Node, realize the synchronous of MN handover information, achieve transfer of data when MN under high reliability is cross-domain to be switched; And when MN initially switches, send to active node and shift out notification message, determine new Care-of Address after shifting out before, the message sent to this MN by active node buffer memory, further increases the reliability of transfer of data in handoff procedure.
Embodiments of the invention additionally provide a kind of active node, and the structure of this active node as shown in Figure 3, comprising:
Message receiver module 301, receives Binding Update message for determining, carries the Correspondent Node list of new Care-of Address and this MN obtained after MN switches in described Binding Update message;
Forwarding strategy determination module 302, for according to described Correspondent Node list, inquires about local routing information, determines the strategy and the Correspondent Node that forward described Binding Update message;
Packet forwarding module 303, for the strategy according to described forwarding Binding Update message, forwards described Binding Update message to corresponding Correspondent Node.
Further, described message receiver module 301, also shifts out notice message for receiving, described in shift out notice message and indicate described MN to switch, described in shift out in notice message and carry the Correspondent Node list of this MN;
Described forwarding strategy determination module 302, also for according to described Correspondent Node list, inquires about local routing information, determines the strategy and the Correspondent Node that shift out notice message described in forwarding;
Described packet forwarding module 303, also for shifting out the strategy of notice message according to described forwarding, shifts out notice message described in forwarding to corresponding Correspondent Node.
Further, as shown in Figure 4, this active node also comprises:
Cache module 304, for after shifting out notice message described in receiving, for described MN creates packet buffer district, and when receiving the message sent to described MN, by this packet buffer in the packet buffer district of this MN;
Described packet forwarding module 303, also for after described message receiver module receives described Binding Update message, according to the new Care-of Address of described MN, sends the message in the packet buffer district of this MN to described MN.
Embodiments of the invention additionally provide a kind of switched system, and this system as shown in Figure 5, comprises the old access node 503 of active node 501, MN502 and described MN, and described active node 501 is the superior node of described old access node 503;
Described active node 501, Binding Update message is received for determining, the Correspondent Node list of new Care-of Address and the MN502 obtained after MN502 switches is carried in described Binding Update message, according to described Correspondent Node list, inquiry local routing information, determine the strategy and the Correspondent Node that forward described Binding Update message, according to the strategy of described forwarding Binding Update message, forward described Binding Update message to corresponding Correspondent Node;
Described MN502, for to switch and after getting new Care-of Address, send described Binding Update message by described old access node 503 to described active node 501, in described Binding Update message, carry the Correspondent Node list of new Care-of Address and the MN502 obtained after MN502 switches.
Further, described active node 501, also shift out notice message for receiving, the described notice message that shifts out indicates described MN502 to switch, described in shift out in notice message and carry the Correspondent Node list of MN502, according to described Correspondent Node list, inquiry local routing information, determine the strategy and the Correspondent Node that shift out notice message described in forwarding, shift out the strategy of notice message according to described forwarding, described in forwarding to corresponding Correspondent Node, shift out notice message;
Described MN502, also for when shifting out from described old access node 503, shifts out notice message by described old access node 503 to described active node transmission.
Further, described active node 501, also for after shifting out notice message described in receiving, for described MN502 creates packet buffer district, when receiving the message sent to described MN502, by this packet buffer in the packet buffer district of MN502, and after receiving described Binding Update message, according to the new Care-of Address of described MN502, send the message in the packet buffer district of this MN to described MN502.
Above-mentioned active node and switched system, can combine with a kind of changing method that embodiments of the invention provide, when MN switches, by specific message, as Binding Update message, the new Care-of Address obtained after this MN of active node switching that notice is corresponding and the Correspondent Node list of this MN, forward Binding Update message by active node to corresponding Correspondent Node, realize the synchronous of MN handover information, achieve transfer of data when MN under high reliability is cross-domain to be switched; And when MN initially switches, send to active node and shift out notification message, determine new Care-of Address after shifting out before, the message sent to this MN by active node buffer memory, further increases the reliability of transfer of data in handoff procedure.
One of ordinary skill in the art will appreciate that realizing all or part of step that above-described embodiment method carries is that the hardware that can carry out instruction relevant by program completes, described program can be stored in a kind of computer-readable recording medium, this program perform time, step comprising embodiment of the method one or a combination set of.
In addition, each functional unit in each embodiment of the present invention can adopt the form of hardware to realize, and the form of software function module also can be adopted to realize.If described integrated module using the form of software function module realize and as independently production marketing or use time, also can be stored in a computer read/write memory medium.
The above-mentioned storage medium mentioned can be read-only memory, disk or CD etc.
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; change can be expected easily or replace, 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 described in claim.
Claims (11)
1. a changing method, is characterized in that, comprising:
Determine to receive Binding Update message, in described Binding Update message, carry the Correspondent Node list of new Care-of Address and this MN obtained after mobile host MN switches;
According to described Correspondent Node list, inquiry local routing information, determines the strategy and the Correspondent Node that forward described Binding Update message;
According to the strategy of described forwarding Binding Update message, forward described Binding Update message to corresponding Correspondent Node;
Described determine to receive the step of Binding Update message before, also comprise:
After receiving and shifting out notice message, be that described MN creates packet buffer district;
When receiving the message sent to described MN, by this packet buffer in the packet buffer district of this MN; When described packet buffer district is full, notice upstream node continues to store the message sent to described MN.
2. changing method according to claim 1, is characterized in that, described determine to receive the step of Binding Update message before, also comprise:
Notice message is shifted out in reception, described in shift out notice message and indicate described MN to switch, described in shift out in notice message and carry the Correspondent Node list of this MN;
According to described Correspondent Node list, inquiry local routing information, determines the strategy and the Correspondent Node that shift out notice message described in forwarding;
Shift out the strategy of notice message according to described forwarding, described in forwarding to corresponding Correspondent Node, shift out notice message.
3. changing method according to claim 1, is characterized in that, the described strategy according to described forwarding Binding Update message, after corresponding Correspondent Node forwards the step of described Binding Update message, also comprises:
According to the new Care-of Address of described MN, send the message in the packet buffer district of this MN to described MN.
4. changing method according to claim 1, is characterized in that, describedly determines that receiving Binding Update message is specially:
Receive message, check the mobile node head type MH the type field of this message header;
If MH the type field is 5, then think that described message is Binding Update message.
5. changing method according to claim 1, is characterized in that, also comprises:
If do not have Correspondent Node information in the Correspondent Node list of described MN, then the home agent to described MN sends described Binding Update message.
6. an active node, is characterized in that, comprising:
Message receiver module, receives Binding Update message for determining, carries the Correspondent Node list of new Care-of Address and this MN obtained after mobile host MN switches in described Binding Update message;
Forwarding strategy determination module, for according to described Correspondent Node list, inquires about local routing information, determines the strategy and the Correspondent Node that forward described Binding Update message;
Packet forwarding module, for the strategy according to described forwarding Binding Update message, forwards described Binding Update message to corresponding Correspondent Node;
Cache module, for after receiving and shifting out notice message, is that described MN creates packet buffer district, and when receiving the message sent to described MN, by this packet buffer in the packet buffer district of this MN;
Described active node, for when described packet buffer district is full, notice upstream node continues to store the message sent to described MN.
7. active node according to claim 6, is characterized in that,
Described message receiver module, also shifts out notice message for receiving, described in shift out notice message and indicate described MN to switch, described in shift out in notice message and carry the Correspondent Node list of this MN;
Described forwarding strategy determination module, also for according to described Correspondent Node list, inquires about local routing information, determines the strategy and the Correspondent Node that shift out notice message described in forwarding;
Described packet forwarding module, also for shifting out the strategy of notice message according to described forwarding, shifts out notice message described in forwarding to corresponding Correspondent Node.
8. active node according to claim 6, is characterized in that, also comprises:
Described packet forwarding module, also for after described message receiver module receives described Binding Update message, according to the new Care-of Address of described MN, sends the message in the packet buffer district of this MN to described MN.
9. a switched system, is characterized in that, comprises the old access node of active node, mobile host MN and described MN, and described active node is the superior node of described old access node;
Described active node, Binding Update message is received for determining, the Correspondent Node list of new Care-of Address and this MN obtained after MN switches is carried in described Binding Update message, according to described Correspondent Node list, inquiry local routing information, determine the strategy and the Correspondent Node that forward described Binding Update message, according to the strategy of described forwarding Binding Update message, forward described Binding Update message to corresponding Correspondent Node;
Described active node, also for after receiving and shifting out notice message, is that described MN creates packet buffer district, when receiving the message sent to described MN, by this packet buffer in the packet buffer district of this MN; When described packet buffer district is full, notice upstream node continues to store the message sent to described MN;
Described MN, for to switch and after getting new Care-of Address, send described Binding Update message by described old access node to described active node, in described Binding Update message, carry the Correspondent Node list of new Care-of Address and this MN obtained after MN switches.
10. switched system according to claim 9, is characterized in that,
Described active node, also shift out notice message for receiving, the described notice message that shifts out indicates described MN to switch, described shifting out in notice message carries the Correspondent Node list of this MN, according to described Correspondent Node list, inquiry local routing information, determines the strategy and the Correspondent Node that shift out notice message described in forwarding, shift out the strategy of notice message according to described forwarding, described in forwarding to corresponding Correspondent Node, shift out notice message;
Described MN, also for when shifting out from described old access node, shifts out notice message by described old access node to described active node transmission.
11. switched systems according to claim 9, is characterized in that,
Described active node, also for after receiving described Binding Update message, according to the new Care-of Address of described MN, sends the message in the packet buffer district of this MN to described MN.
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| CN101018189A (en) * | 2006-02-10 | 2007-08-15 | 北京航空航天大学 | A path optimization method for hierarchical mobile IPv6 |
| CN101005444A (en) * | 2006-06-24 | 2007-07-25 | 华为技术有限公司 | Method and device for quick switching |
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