CN1253024C - Fast switching method between subnetworks used on MIPV6 - Google Patents
Fast switching method between subnetworks used on MIPV6 Download PDFInfo
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Abstract
The present invention relates to a method for quickly switching between MIPv6 subnetworks, which relates to the field of internet mobile communication, particularly to a method for quickly switching a mobile node between the subnetworks under wireless mobile environment according to MIPv6. The method is characterized in that information relevant to switching is diffused to wireless access points and access routers connected with the wireless access points of an intersection by calculating the intersection of adjacent wireless access points of two access routers before and after switching; then, quick switching specification is carried out. The present invention defines the calculation method of the intersection and a process for diffusing switching information, which can increase the successful rate of quick mobile switching. Particularly, under the condition of poor wireless link mass ratios, the effect of the present invention is obvious, and network resources can not be excessively occupied.
Description
Technical field:
The present invention relates to the internet mobile communication field, especially between subnet, carry out fast switching method according to MIPv6 mobile node under wireless mobile environment.
Background technology:
In the Internet traffic field, along with popularizing of portable equipment, the mobile subscriber is more and more, during they press for and enter the Internet whenever and wherever possible, and at the subnet internetwork roaming.Therefore, internet engineering task tissue (InternetEngineering Task Force, hereinafter to be referred as IETF) mover agreement (Mobility Support for Internet Protocol version 6 the is called for short MIPv6) rules of Internet Protocol the 6th edition have been proposed.MIPv6 is the agreement of the visit IP network that the mobile node that makes roaming (Mobile Node is called for short MN) can be seamless.MIPv6 uses WAP (wireless access point) (Access Point is called for short AP) to realize that wireless network is linked in the cable network usually.WAP (wireless access point) is connected with a router in the cable network, then can connect a plurality of WAP (wireless access point) on the router, and this router is commonly referred to couple in router (Access Router is called for short AR).WAP (wireless access point) is responsible for receiving the wireless signal of mobile node, and wireless signal is converted to link signal sends to the couple in router that is attached thereto, otherwise or.Couple in router also should be able to be handled the access of mobile node except possessing common router feature.
As Fig. 1, the MIPv6 protocol definition: the subnet at the original place of mobile node is local network (Home Network), and the address with home network prefix that obtains in local network is raw address (Home Address).Local agent (Home Agent is called for short HA) is arranged in local network, and special disposal communication corresponding node (Correspondent Node is called for short CN) is for the visit of mobile node.When mobile node moves to field network (Foreign Network), acquisition belongs to the temporary address of field network---be also referred to as Care-of Address (Care of Address, be called for short CoA), and register to local agent, make local agent know the network and the Care-of Address at the current place of mobile node.Like this, when the raw address of certain communication corresponding node visit mobile node, local agent is tackled these messages, and is forwarded to the Care-of Address (be as label among Fig. 11 path) of mobile node by the tunnel.When communication after corresponding node knows the Care-of Address of mobile node, can also be directly and the Care-of Address of mobile node communicate (be 2 path) as label among Fig. 1.
Because mobile node is when a field network moves to another field network, WAP (wireless access point) and couple in router all change thereupon, its Care-of Address in field network also should change, and to new subnet and the Care-of Address of local agent registration, this process is referred to as standard and switches.When mobile node moved to field network away from local network, standard is switched will produce following problem:
1) overlong time of Qie Huaning especially causes very big influence to real time business.
2) message dropping is more serious in the handoff procedure, the interruption that causes service quality to descend even serve.
In order to address the above problem, the mobile IP working group (mobileip) of IETF has proposed quick handover scheme.In the draft Fast Handovers for Mobile IPv6 of in March, 2002 issue, defined a kind of quick handover scheme.This scheme is utilized source trigger (Source Trigger, be called for short ST, being the link layer interface, for example providing by wireless network card) information with mobile node before switching beginning sends to new couple in router by old couple in router, thereby accelerates handoff procedure.But this scheme is not considered the new WAP (wireless access point) of pointing out and the actual asynchronous situation of switching of new WAP (wireless access point) in the trigger of source, switching will be failed fast this moment, and the standard of getting back to is switched.And not good in radio link quality, perhaps under the situation, the occurrence probability of this situation is bigger to the mobile node translational speed faster.Thereby need the better fast switch over method of a kind of robustness in this case.
Summary of the invention:
The purpose of this invention is to provide fast switch over method between the subnet that a kind of robustness better is used for MIPv6, under wireless mobile environment, to improve the MIPv6 success rate for switching.
Technical solution of the present invention is as follows:
Changing method is: 1. adopt the set of all adjacent WAP (wireless access point) of new couple in router pointed in the selection of AP intersection algorithm and old couple in router and the source trigger; 2. old couple in router with the diffusion of information of relevant switching in the corresponding couple in router of the selected WAP (wireless access point) of this AP intersection algorithm; 3. mobile node switches fast.
In such scheme, the concrete workflow of each device is as follows:
When the workflow of described mobile node comprises the steps: that (1) mobile node will switch to new WAP (wireless access point), receive the notice of source trigger; (2) send router solicitation to old couple in router and act on behalf of message; (3) receive the agent router bulletin that old couple in router returns; (4) before link switchover begins, receive the notice of loss of link trigger, send the FBU message, enter physical link then and switch to old couple in router; When (5) link switchover is finished, receive that link connects the notice of trigger,, send the NA message if mobile node has been received the FBACK message; If do not receive, send the FNA message, and wait for the RA message that comprises NAACK option and IP option that new couple in router sends; (6) if new Care-of Address is effective, sends the BU message, register to local agent;
The workflow of described old couple in router comprises the steps: that (1) disposes the adjacent WAP (wireless access point) and the information of couple in router; (2) regularly send the APNS message, and receive the APNA message of response, try to achieve the set of common adjacent WAP (wireless access point) to adjacent couple in router; (3) router solicitation that receives mobile node is acted on behalf of message, returns the agent router advertisement message; (4) Xiang Yuxin, the common adjacent couple in router set of old couple in router send the HI message, receive the HACK message that they return; (5) receive the FBU message that mobile node sends, be established to the tunnel of new couple in router; Result according to the HACK message sends the FBACK message to the old Care-of Address of mobile node; (6) receive the message of the old Care-of Address that mails to mobile node, mail to new couple in router after using the IP tunnel encapsulation;
The workflow of the selected corresponding couple in router of described AP intersection algorithm comprises the steps: that (1) disposes the adjacent WAP (wireless access point) and the information of couple in router; (2) receive the APNS message, respond an APNA message; (3) receive the HI message that old couple in router sends, wherein Care-of Address is carried out duplicate address detection, return the HACK message; (4) add the main frame route of the old Care-of Address of mobile node to; (5) if receive the NA message that mobile node sends, return common RA message; If receive the FNA message that mobile node sends, return the RA message of band NAACK option and IP option; (6) receive the message of tunnel encapsulation, after the decapsulation with the old Care-of Address of message routing to mobile node; (7) if do not receive the NA or the FNA message of mobile node, then regularly deletion is the handover information of mobile node buffer memory.
Wherein: in 1. old couple in router and the source trigger between the pointed new couple in router by the APNS AP information adjacent with the APNA message switching, calculate adjacent AP and occur simultaneously.2. old couple in router sends the HI message to the corresponding couple in router of the selected WAP (wireless access point) of AP intersection algorithm, and receives the HACK message of its response, thereby handover information is diffused in these couple in routers.
The present invention can improve the MIPv6 success rate for switching greatly under wireless mobile environment, make the switching of MIPv6 under abominable wireless environment seldom fail, and is the better fast switch over method of robustness of a kind of MIPv6 of being applicable to, has good application prospects.
Description of drawings:
Fig. 1 is the structural representation of MIPv6 agreement.
Fig. 2 is the fast handover procedures schematic diagram of ietf draft Fast Handovers for Mobile IPv6.
Fig. 3 is the packet format of APNS message.
Fig. 4 is the packet format of APNA message.
Fig. 5 is the form of the sub-option of the stay of two nights of AP link layer address.
Fig. 6 is the form of the IP address option of icmp packet.
Fig. 7 is the embodiment workflow diagram of mobile node.
Fig. 8 is the embodiment workflow diagram of old couple in router.
Fig. 9 is the embodiment workflow diagram of the corresponding couple in router of AP common factor.
(Fig. 7～9 are subjected to page-size to limit every figure to be divided into two sections because of flow process is longer)
Concrete execution mode:
Embodiments of the invention are realized (but the present invention is not restricted to this embodiment) under linux operating system, main implementation process is as follows:
In linux operating system, load IPv6 module and MIPv6 module, load the software module of writing then,, mobile node is switched fast between WAP (wireless access point) with the function of simulation corresponding mobile node or couple in router according to said method.The realization block diagram of each concrete module sees also accompanying drawing 7～9.
Below content of the present invention is described in detail:
A) application scenarios
Mobile node is current to be connected on the field network, and prepares to switch on another field network.Residing field network was old subnet before we claimed to switch, and couple in router wherein is old couple in router, and the WAP (wireless access point) that is attached thereto is called old WAP (wireless access point), and the Care-of Address in this network is old Care-of Address; Switching the residing field network in back is new subnet, and couple in router wherein is new couple in router, and the WAP (wireless access point) that is attached thereto is new WAP (wireless access point), and the Care-of Address in this network is new Care-of Address.
In the present invention, the WAP (wireless access point) adjacent with couple in router refers to the WAP (wireless access point) that connect with this couple in router itself adjacent those WAP (wireless access point) on coverage; The couple in router adjacent with couple in router refers to the couple in router that WAP (wireless access point) be connected adjacent with this couple in router; The WAP (wireless access point) common adjacent with certain two adjacent couple in router refers to those WAP (wireless access point) all adjacent with these two couple in routers.
B) the existing fast switch over method of MIPv6
Fast handover procedures under the MIPv6 condition among the draft Fast Handovers for Mobile IPv6 in the Radio Link of defined is as shown in Figure 2:
For mobile node: when (1) will switch to new WAP (wireless access point), receive the notice of source trigger, comprising the link layer address of new WAP (wireless access point).(2) send router solicitation to old couple in router and act on behalf of message (RouterSolicitation Proxy is called for short RtSolPr), wherein comprise the link layer address of the new WAP (wireless access point) that from the trigger of source, obtains.(3) receive agent router advertisement message (the Proxy RouterAdvertisement that old couple in router returns, be called for short PrRtAdv), the subnet prefix that wherein comprises the new subnet at the new WAP (wireless access point) place of being asked, the link layer address of new couple in router, and advise the Care-of Address that mobile node uses in new subnet.(4) before link switchover begins, receive the loss of link trigger notice of (Link-Down trigger is called for short LD), send quick Binding Update (Fast Binding Update is called for short FBU) message, enter link switchover then to old couple in router.When (5) link switchover is finished, receive that link connects trigger (Link-Up trigger, abbreviation LU) notice, if mobile node has received that quick binding admits (Fast Binding Acknowledgment, be called for short FBACK) message (pointing out wherein whether the new Care-of Address in the agent router advertisement message is effective), just send neighbours' bulletin (Neighbor Advertisement is called for short NA) message; If do not receive, then send quick neighbours' bulletin (FastNeighbor Advertisement, be called for short FNA) message, and wait for router advertisement (the Router Advertisement that new couple in router sends, be called for short RA) message, wherein comprise neighbours' bulletin and admit (NeighborAdvertisement Acknowledge is called for short NAACK) option, point out whether new Care-of Address is effective.(6), send Binding Update (Binding Update is called for short BU) message to local agent and register if new Care-of Address is effective.
For old couple in router: the map information of the couple in router that (1) configuration is adjacent and the WAP (wireless access point) of connection thereof, comprise the IP address of couple in router and the link layer address of WAP (wireless access point), build table.(2) router solicitation that receives mobile node is acted on behalf of message, tables look-up, and returns the agent router advertisement message.(3) send switching beginning (Handover Initiate is called for short HI) message to new couple in router, request is carried out duplicate address detection to new Care-of Address; And receive the switching that new couple in router returns and admit (Handover Acknowledge is called for short HACK) message, comprising the Care-of Address of being asked information whether effectively.(4) receive the FBU message that mobile node sends, be established to the tunnel of new couple in router; The result of the HACK message that returns according to new couple in router sends the FBACK message to the old Care-of Address of mobile node.(5) receive the message of the old Care-of Address that mails to mobile node, by mailing to new couple in router after the tunnel encapsulation.
Whether effectively for new couple in router: (1) receives the HI message that old couple in router sends, and the new Care-of Address of wherein pointing out is carried out duplicate address detection, return new Care-of Address information in the HACK message.(2) add the main frame route of the old Care-of Address of mobile node to.(3) the FNA message of reception mobile node, whether effective information is returned in the NAACK of RA message option with the new Care-of Address in the HI message.(3) receive the message of tunnel encapsulation, after the decapsulation with the old Care-of Address of message routing to mobile node.
C) fast switch over method of the selection AP common factor of the present invention's proposition
Bad in radio link quality, perhaps under the too fast situation of mobile node translational speed, be easy to occur mobile node and in fact switch on the WAP (wireless access point) different, cause above-mentioned quick handoff failure, can not improve switch speed and quality with indication in the trigger of source.
Find that after deliberation in these cases, when the source trigger triggered, in fact mobile node was in the coverage of two WAP (wireless access point) (being new WAP (wireless access point) and old WAP (wireless access point)) overlapping.So the WAP (wireless access point) of the actual switching of mobile node must be the common neighbours of these two WAP (wireless access point).Therefore, the present invention proposes, should will not only be sent to about the information of switching in the couple in router that is connected with the WAP (wireless access point) pointed out in the trigger of source, also be sent to couple in router that both all common adjacent WAP (wireless access point) are connected in carry out information exchange.Can predict, the WAP (wireless access point) of the actual switching of mobile node, must be among them, like this, because the actual couple in router that WAP (wireless access point) connected that switches has been received handover information in advance, so can directly switch fast, thereby speed and quality that assurance is switched.
Fast switch over method proposed by the invention is as follows:
1. adopt the set of all adjacent WAP (wireless access point) of new couple in router pointed in the selection of AP intersection algorithm and old couple in router and the source trigger;
2. old couple in router with the diffusion of information of relevant switching in the corresponding couple in router of the selected WAP (wireless access point) of this AP intersection algorithm;
3. mobile node switches fast.
Concrete improvement thes contents are as follows:
(1) in old couple in router and the source trigger between the pointed new couple in router by the APNS AP information adjacent with the APNA message switching, calculate adjacent AP and occur simultaneously.
In above-mentioned processing, needing increases a key technology---neighbor AP choice mechanism, and the AP that promptly obtains between old couple in router and the new couple in router occurs simultaneously.For this reason, need definition two new ICMP (being ICMP, Internet Control Message Protocol) message, be used for exchange neighbor AP information between new, the old couple in router.
1. neighbor AP request (AP Neighbor Solicitation is called for short APNS).This message is used for old couple in router to other adjacent access router request neighbor AP information.Message format such as accompanying drawing 3.Particular content is:
Type: type, value is tentative to be 159, treats internet numerical value distributor gear (Internet Assigned NumbersAuthority is called for short IANA) affirmation;
Code:ICMP code, value are 0;
The Checksum:ICMP verification and;
Reserved: untapped territory, it must the person of being sent out be set to 0, and the person of being accepted ignores;
Options: the option that this message comprises.Be link layer address (Link-layer Address) option of this couple in router, the sub-type in this option must be set to 1, is the link layer address of AP to show this.
2. neighbor AP is announced (AP Neighbor Advertisement is called for short APNA).This message is used to receive that the couple in router of APNS returns the neighbor AP information of oneself to the requestor.Message format such as accompanying drawing 4.Particular content is:
Type: type, value is tentative to be 160, treats that IANA confirms;
Code:ICMP code, value are 0;
The Checksum:ICMP verification and;
Reserved: untapped territory, it must the person of being sent out be set to 0, and the person of being accepted ignores;
Options: the option that this message comprises.Be link layer address (Link-layer Address) option of this couple in router, the sub-type in this option must be set to 1, is the link layer address of AP to show this.
AP occurs simultaneously and can obtain by following steps:
(1) each couple in router is all preserved the information (being link layer address) of the AP adjacent with oneself, builds table.This neighbor AP information can obtain by method or other suitable method of manual configuration.
(2) the neighbor AP table of each couple in router periodic refreshing oneself when certain list item is soon expired, sends the neighbor AP request to corresponding couple in router, receives that the couple in router of neighbor AP request returns the neighbor AP bulletin in response.
(3) couple in router that sends request is made a common factor with the neighbor AP set of oneself with the neighbor AP set in the bulletin, and the common element of two set i.e. neighbor AP and the common neighbours of oneself for this reason; This AP occurs simultaneously and is the selected WAP (wireless access point) of AP intersection algorithm.
(2) occur simultaneously, send the HI message according to the AP that obtained by old couple in router corresponding couple in router (i.e. the couple in router that is connected with the selected WAP (wireless access point) of AP intersection algorithm) in AP occurs simultaneously, thus will be to these couple in routers about the diffusion of information of switching; And receive the HACK message that these couple in routers return.
(3) before link switchover began, mobile node sent the FBU message to old couple in router, wherein comprised the link layer address of the new WAP (wireless access point) of actual switching, entered physical link then and switched.After link switchover is finished,, then send the NA message if mobile node has been received the FBACK message; Otherwise send the FNA message.
(4) if new couple in router is received the NA message that mobile node sends, return common RA message; If receive the FNA message that mobile node sends, return the RA message of band NAACK option and IP option.
For this reason, also need to redefine or revise some messages, be listed below:
1. the sub-option of the FBU stay of two nights is added the sub-option of AP link layer address (Link-layer Address of AP), optional
There is not sub-option can comprise the information of the AP of actual switching in the optional sub-option of former FBU stay of two nights option.In order to add the information of the actual AP that switches in FBU stay of two nights option, the present invention has defined this sub-option, as one of optional sub-option of FBU.This is the sub-option of an IPv6 message stay of two nights option.Message format such as accompanying drawing 5.Particular content is:
Type: type, 1 byte, value is tentative to be 5, treats that IANA confirms;
Length: length, 1 byte, expression does not comprise the sub-option of AP link layer address in type and length territory, is unit with the byte;
The link layer address of Link-layer Address of AP:AP.
2. the RA message is added IP address (IP Address) option, optional
In MIPv6 switches fast, the RA message has been added a NAACK option, be used for pointing out whether the new Care-of Address of HI message is effective.Also need add optional IP address option among the present invention, the AP that switches in reality and the AP in the trigger of source not simultaneously, the effectively new Care-of Address that provides that mobile node uses in new subnet.Message format such as accompanying drawing 6.Particular content is:
Type: type, 1 byte, value is tentative to be 7, treats that IANA confirms;
Length: length, 1 byte, value are 16, the length of expression IP address option is unit with 8 bytes;
Reserved: keep, 4 bytes must be set to 0 in the side of being sent out, and the side of being received is ignored;
IPv6 Address:IPv6 address, new Care-of Address, 16 bytes.
Above-mentioned message has been arranged, can finish the present invention, its concrete switch step is as follows:
When the workflow of described mobile node comprises the steps: that (1) mobile node will switch to new WAP (wireless access point), receive the notice of source trigger, comprising the link layer address of new WAP (wireless access point).(2) send router solicitation to old couple in router and act on behalf of message, wherein comprise the link layer address of the new WAP (wireless access point) that from the trigger of source, obtains.(3) receive the agent router bulletin that old couple in router returns, wherein comprise the subnet prefix of new subnet at the new WAP (wireless access point) place of request, the link layer address of new couple in router, and the Care-of Address that in new subnet, uses of suggestion mobile node.(4) before link switchover begins, receive the notice of loss of link trigger, wherein comprise the link layer address of the new WAP (wireless access point) of actual switching; Send the FBU message to old couple in router, wherein comprise the link layer address of the new WAP (wireless access point) of actual switching, enter physical link then and switch.When (5) link switchover is finished, receive that link connects the notice of trigger, if the AP of actual switching is identical with the AP in the trigger of source, and mobile node has received that (if the actual AP that switches is identical with AP in the trigger of source, the FBACK message points out whether the new Care-of Address of agent router in announcing be effective to the FBACK message; If the AP of actual switching is different with the AP in the trigger of source, then the FBACK message points out that the new Care-of Address in the agent router bulletin is invalid), send the NA message; In addition, mobile node sends the FNA message, and wait for the RA message that new couple in router sends, wherein comprise NAACK option and IP address option (if the actual AP that switches is identical with AP in the trigger of source, the NAACK option points out whether the new Care-of Address in the agent router bulletin is effective, if invalid, in the IP option, provide effectively new Care-of Address; If the actual AP that switches is different with AP in the trigger of source, then ignore the NAACK option, with the address in the IP option as effective Care-of Address newly).(6) if new Care-of Address is effective, sends the BU message, register to local agent.
The workflow of described old couple in router comprises the steps: that (1) disposes the adjacent WAP (wireless access point) and the information of couple in router, builds table.(2) regularly send the APNS message to adjacent couple in router, and the APNA message of reception response, adjacent WAP (wireless access point) set is wherein done one with the adjacent WAP (wireless access point) set of oneself occurs simultaneously, try to achieve the set of the WAP (wireless access point) common adjacent, and write down this common factor with these two couple in routers.(3) router solicitation that receives mobile node is acted on behalf of message, link layer address according to wherein WAP (wireless access point) is tabled look-up, return the agent router advertisement message, the prefix that wherein comprises new subnet, the new Care-of Address that the link layer address of new couple in router and suggestion mobile node use in new subnet.(4) Xiang Yuxin, the common adjacent couple in router set of old couple in router send the HI message, and request is carried out duplicate address detection to new Care-of Address; Receive the HACK message that they return, point out wherein whether the new Care-of Address of asking is effective.Simultaneously, buffer memory HACK message information.(5) receive the FBU message that mobile node sends,, be established to the tunnel of new couple in router according to the AP of the actual switching that wherein comprises; (whether if the AP that the new AP of the actual switching that mobile node is pointed out in FBU and router solicitation are acted on behalf of in the message is identical, it is effective to return the new Care-of Address of agent router in announcing in the FBACK message to send the FBACK message according to the result of HACK message to the old Care-of Address of mobile node; If the AP that the new AP and the router solicitation of the actual switching that mobile node is pointed out are acted on behalf of in the message is different, point out that in the FBACK message the new Care-of Address in the agent router bulletin is invalid in FBU).And the HACK message information of the correspondence of deletion buffer memory.(6) receive the message of the old Care-of Address that mails to mobile node, mail to new couple in router after using the IP tunnel encapsulation.
The workflow of the selected corresponding couple in router of described AP intersection algorithm comprises the steps: that (1) disposes the adjacent WAP (wireless access point) and the information of couple in router, builds table.(2) receive the APNS message, table look-up, respond an APNA message, wherein comprise set with own adjacent WAP (wireless access point).(3) receive the HI message that old couple in router sends, wherein Care-of Address is carried out duplicate address detection, return the HACK message, the new Care-of Address that wherein comprises suggestion is invalid information effectively still; When Care-of Address is invalid, return an effective Care-of Address.And the information of buffer memory HACK message information and relevant mobile node.(4) add the main frame route of the old Care-of Address of mobile node to.(5) if receive the NA message that mobile node sends, return common RA message; If receive the FNA message that mobile node sends, return the RA message of band NAACK option and IP address option, comprise whether effectively information of the Care-of Address of advising in the HI message in the NAACK option, and use the IP option to return effectively new Care-of Address.(6) receive the message of tunnel encapsulation, after the decapsulation with the old Care-of Address of message routing to mobile node.(7) if do not receive the NA or the FNA message of mobile node, then delete the information and the HACK message information of corresponding mobile node afterwards at certain hour (recommended value is 1 second).
During concrete enforcement,, can finish corresponding every function as long as in corresponding each device, load the software module of writing according to said method.
By above-mentioned processing, just avoided, thereby improved the quick success rate for switching of MIPv6 owing to the quick handoff failure of the different MIPv6 of causing of AP in the AP of the actual switching of mobile node and the source trigger.
D) effect
In order to check effect of the present invention, the WAP of having simulated the source trigger at the linux platform switches with actual The different situation of WAP. The result shows that when not using the inventive method, handoff failure returns fast Switch to standard, handoff delay is about 1 second; When using the inventive method, quick handover success, handoff delay reduces To about 200 milliseconds.
In above-mentioned processing, added some new options and sub-option, when not being familiar with these options and sub-option, move Moving node and couple in router are only ignored them, so new method and original method are complete compatibilities.
And in above-mentioned processing, old couple in router only returns an agent router bulletin to mobile node, other Couple in router also only return the HACK message to old couple in router, the newspaper of having avoided mobile node when switching, to process Literary composition is too much, and over-burden; Each couple in router receive need behind the HI message to preserve about the information of mobile node also tool Arranged certain life cycle, after the existence expiration, if find that mobile node is not in active state in subnet, just delete this A little information are with conserve network resources.
Claims (2)
1, fast switch over method between a kind of subnet that is used for MIPv6 is characterized in that:
1. adopt the set of all adjacent WAP (wireless access point) of new couple in router pointed in the selection of AP intersection algorithm and old couple in router and the source trigger;
2. old couple in router with the diffusion of information of relevant switching in the corresponding couple in router of the selected WAP (wireless access point) of this AP intersection algorithm;
3. mobile node switches fast.
When the workflow of described mobile node comprises the steps: that (1) mobile node will switch to new WAP (wireless access point), receive the notice of source trigger; (2) send router solicitation to old couple in router and act on behalf of message; (3) receive the agent router bulletin that old couple in router returns; (4) before link switchover begins, receive the notice of loss of link trigger, send the FBU message, enter physical link then and switch to old couple in router; When (5) link switchover is finished, receive that link connects the notice of trigger,, send the NA message if mobile node has been received the FBACK message; If do not receive, send the FNA message, and wait for the RA message that comprises NAACK option and IP option that new couple in router sends; (6) if new Care-of Address is effective, sends the BU message, register to local agent;
The workflow of described old couple in router comprises the steps: that (1) disposes the adjacent WAP (wireless access point) and the information of couple in router; (2) regularly send the APNS message, and receive the APNA message of response, try to achieve the set of common adjacent WAP (wireless access point) to adjacent couple in router; (3) router solicitation that receives mobile node is acted on behalf of message, returns the agent router advertisement message; (4) Xiang Yuxin, the common adjacent couple in router set of old couple in router send the HI message, receive the HACK message that they return; (5) receive the FBU message that mobile node sends, be established to the tunnel of new couple in router; Result according to the HACK message sends the FBACK message to the old Care-of Address of mobile node; (6) receive the message of the old Care-of Address that mails to mobile node, mail to new couple in router after using the IP tunnel encapsulation;
The workflow of the selected corresponding couple in router of described AP intersection algorithm comprises the steps: that (1) disposes the adjacent WAP (wireless access point) and the information of couple in router; (2) receive the APNS message, respond an APNA message; (3) receive the HI message that old couple in router sends, wherein Care-of Address is carried out duplicate address detection, return the HACK message; (4) add the main frame route of the old Care-of Address of mobile node to; (5) if receive the NA message that mobile node sends, return common RA message; If receive the FNA message that mobile node sends, return the RA message of band NAACK option and IP option; (6) receive the message of tunnel encapsulation, after the decapsulation with the old Care-of Address of message routing to mobile node; (7) if do not receive the NA or the FNA message of mobile node, then regularly deletion is the handover information of mobile node buffer memory.
2, the method for claim 1 is characterized in that:
1. in old couple in router and the source trigger between the pointed new couple in router by the APNS AP information adjacent with the APNA message switching, calculate adjacent AP and occur simultaneously;
2. old couple in router sends the HI message to the corresponding couple in router of the selected WAP (wireless access point) of AP intersection algorithm, and receives the HACK message of its response, thereby handover information is diffused in these couple in routers.
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| US7483409B2 (en) * | 2005-12-30 | 2009-01-27 | Motorola, Inc. | Wireless router assisted security handoff (WRASH) in a multi-hop wireless network |
| CN101005444B (en) * | 2006-06-24 | 2011-12-07 | 华为技术有限公司 | Method and device for quick switching |
| CN101304365B (en) * | 2007-05-08 | 2012-12-12 | 华为技术有限公司 | Authentication method and authentication system |
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