CN102045769A - Heading compress text transfer method in Internet of things (IOT) prestressed handover - Google Patents
Heading compress text transfer method in Internet of things (IOT) prestressed handover Download PDFInfo
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Abstract
The invention relates to a heading compress text transfer method in Internet of things (IOT) prestressed handover, and belongs to the technical field of network handover text transfer. The method mainly comprises two steps that: a mobile phone predicts that an old access router is informed to prepare text transfer after handover; and the old access router and the mobile node acquire link disconnection information by using two layers of triggers, and then synchronously start text transfer operation. By transferring the heading compress text, a process of rebuilding the heading compress text during handover is avoided, the influence of the handover on the heading compress performance is reduced, and the problem of high overhead for rebuilding the heading compress text during handover is solved.
Description
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Technical field:
The present invention relates to a letter compressed context metastasis in a kind of network switching process, shift trigger policy with the real-time context that uses two layers of trigger more specifically to a kind of two step letter compressed context transfer method.
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Background technology:
At Internet protocol (IP, Internet Protocol) carries out context transfer (CT between access network nodes, Context Transfer) mainspring is to be the Fast Reconstruction context, participates in reruning a whole set of agreement and need not mobile node, avoid from the signaling that mails to mobile node.
There is a lot of articles all to relate to the thought of context transfer before this, such as:
Rajeev Koodli discusses the context transfer under the mobile environment, has reduced the message time delay on the Radio Link as much as possible.
People such as C edric Westphal use the mathematical modeling method, to rebuilding robustness letter head compression (ROHC, RObustness Heading Compress) cost paid of context is analyzed, point out to be necessary to use a kind of mechanism, when switching with current ROHC context transfer in new couple in router.
People such as Ha Duong shift the compressed context of the letter in the mobile IP network and discuss, solved the problem that message dropping need retransmit when switching, propose a kind of method of compressive state rollback, avoid the problem that between transfer period, causes the ROHC context to rebuild because of packet loss.Simultaneously, he has also proposed to utilize mobile IP signaling directly the ROHC context to be transferred on the new couple in router from mobile node, with context asynchronous problem with the mobile node end after switching of avoiding going over from old couple in router transfer, but this method will increase the Radio Link burden.
People such as Liu Chuda have proposed a kind of context transfer framework based on service quality (QoS) based on the fast hierarchical mobile IP v 6, remedied the deficiency that context only shifts between couple in router in the context transfer protocol (CXTP, Context Transfer Protocol) before and after switching.People such as Sun Weifeng and Sun Haitao also is that research is based on QoS context transfer technology on handover mechanism, and groundwork also is to study how effectively in conjunction with context transfer message and hand off signaling.Fabien Allard has proposed a kind of scheme based on CXTP under the mobile IP v 6 environment, be used in context transfer security threat being protected.
People's such as Peng Jun scheme is by the quick Binding Update (FBU of expansion fast hierarchical MIPv6, Fast Binding Update)/switch and initiate (HI, Handover Initiate)/handover acknowledge (HAck, Handover Acknowledge) message is in order to activation and shift context.In the scheme context transfer is activated request message as the FBU messages option, context transfer data message is carried transmission by HI, HAck carries the context transfer data acknowledge message, when triggering switching fast, trigger the context transfer between couple in router, make context transfer to switch concurrent execution with mobile node.But the limitation of this scheme is: the context transfer data acknowledge message is attached to be with slightly in HAck as option send back to, so the HAck signaling need wait for that context transfer finishes, be that the end that handoff procedure depends on the context transfer process could continue down to carry out, and in fact whether handoff procedure should not depend on the context transfer process and finish.
Context transfers mechanism to the expense on the minimizing Radio Link of great use.But from existing research, most of context transfer technology is all at QoS, in their scheme contextual real-time is also considered simultaneously, do not consider the context situation of mobile node end equally, also exist the compression and decompression context at the mobile node end, variation has also taken place in these contexts before and after switching.
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Summary of the invention
Technical problem to be solved of the present invention provides the method for the context transfer of a kind of ROHC of being applicable to; By shifting a letter compressed context, rebulid the process of letter head compressed context when avoiding switching, reduce to switch influence to the compression of letter head, solve in the handoff procedure and rebulid the big problem of letter head compressed context expense.
The present invention adopts following technical scheme for achieving the above object:
A letter compressed context transfer method during a kind of Internet of Things formula of answering is in advance switched comprises the steps:
Couple in router is switched in the selected target from candidate access router of steps A, mobile node, predict after switching will take place by two layers of trigger then, adopt fast hierarchical MIPv6 module notification context transfer protocol module to send context transfer message to old couple in router, old couple in router is ready to context to be used for transfer operation;
After step B, old couple in router and mobile node adopt separately two layers of trigger to obtain link disconnection information respectively, extracting required contextual information respectively from a robustness letter compression module separately shifts, old couple in router end transmits old compression/decompression contextual information to new couple in router end, enters next step;
Step C, when the context transfer of robustness letter head compression to new couple in router, the new on-link care-of address information that new couple in router will adopt fast hierarchical MIPv6 module to obtain is sent to the context transfer protocol module;
Step D, new couple in router carry out contextual information according to new on-link care-of address information to be upgraded, and the contextual information after will upgrading is installed in the robustness letter compression module;
Step e, after the context transfer process begins, old couple in router obtains the sequence number of last grouping of compressing with old compressed context, send it to new couple in router, after the context transfer process is finished, adopt this sequence number from the grouping of buffer memory, to find out next grouping at new couple in router end, and utilize new compressed context that it is compressed.Obtain continuity like this, also guarantee the continuity of the grouping of understanding pressure side institute decompress(ion) simultaneously to a certain extent packed compressed process.
Further, a letter compressed context transfer method during the Internet of Things of the present invention formula of answering is in advance switched, described old couple in router, mobile node, new couple in router comprise two layers of trigger, fast hierarchical MIPv6 module, context transfer protocol module, a robustness letter compression module respectively.
Further, a letter compressed context transfer method during the Internet of Things of the present invention formula of answering is in advance switched, the concrete contextual information content that described old couple in router, mobile node shift is in a robustness letter compression module.
Further, Internet of Things of the present invention is answered a letter compressed context transfer method in the formula switching in advance, and the context type of described robustness letter head compression comprises that the compressed context reconciliation presses hereinafter; For upstream packet, what mobile node need upgrade is compressed context, and new couple in router need be the decompress(ion) context by what shift acquisition; For downlink grouped, what mobile node need upgrade is the decompress(ion) context, and new couple in router need be a compressed context by what shift acquisition.
Further, a letter compressed context transfer method during the Internet of Things of the present invention formula of answering is in advance switched does not cause packet loss and can obtain less time delay in handoff procedure, then:
On old link, old couple in router and mobile node utilize old compressed context and old decompress(ion) context that last grouping of transmitting on the old link is compressed and decompress(ion) respectively before switching;
Switch the back on new link, new couple in router and mobile node utilize new compressed context and new explanation to press hereinafter respectively first grouping of transmitting on the new link is compressed and decompress(ion).
Further, a letter compressed context transfer method during the Internet of Things of the present invention formula of answering is in advance switched, two layers of trigger comprise that the old link between announcement mobile node and the old couple in router disconnects, and the announcement mobile node is connected with the new link establishment between the couple in router newly.
The present invention adopts above technical scheme, has following beneficial effect:
The present invention rebulids the process of letter head compressed context by shifting a letter compressed context when avoiding switching, reduce to switch the influence to a letter compression performance, solves in the handoff procedure and rebulids the big problem of letter head compressed context expense.
Description of drawings:
Fig. 1 is the fast hierarchical MIPv6 hand off signaling flow chart that a band robustness letter compressed context shifts.
Among the figure:
RtSolPr(Router Solicitation for Proxy): be the router proxy requests notice message that mobile node (MN) sends to mobility anchor point (MAP);
PrRtAdv(Proxy Router Advertisement): be the agent router notice message that the mobility anchor point sends to mobile node;
FBU(Fast Binding Update): be the quick binding update messages that mobile node (MN) sends to mobility anchor point (MAP);
HI(Handover Initiate): be that the switching about mobile node (MN) that mobility anchor point (MAP) sends to new couple in router (nAR) begins message;
Hack(Handover Acknowledge): be that new couple in router (nAR) sends to the switch acknowledgment message of mobility anchor point (MAP) as the response of HI;
FBAck(Fast Binding Acknowledgment): the quick binding acknowledgement message that is mobility anchor point (MAP) response FBU;
CTAR(Context Transfer Activate Request): be the context transfer activation request message that mobile node (MN) sends to old couple in router (pAR);
CTD(Context Transfer Data): be the context transfer data message that old couple in router (pAR) sends to new couple in router (nAR);
CTDR(Context Transfer Data Reply): be the context transfer data response message that new couple in router (nAR) sends to old couple in router (pAR);
UNA(Unsolicited Neighbor Advertisement): be the unsolicited neighbor advertisement message that mobile node (MN) sends to new couple in router (nAR);
LBU(Local Binding Update): be the local binding update messages that mobile node (MN) sends to mobility anchor point (MAP);
LBAck(Local Binding Acknowledge): mobility anchor point (MAP) sends to the local Binding Update acknowledge message of mobile node (MN);
CARD(Candidate Access Router Discovery): be that the candidate inserts route discovery protocols;
LinkDown: be two layers of trigger that link disconnects;
LinkUp: two layers of trigger that are link establishment.
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Specific embodiments:
Be described in further detail below in conjunction with the enforcement of accompanying drawing technical scheme:
Fig. 1 is that a band robustness letter compressed context of the present invention shifts the fast hierarchical MIPv6 hand off signaling flow chart of (ROHC CT), is specially:
A) mobile node (MN, Mobile Node) inserts route discovery mechanisms (CARD by the candidate, Candidate Access Router Discovery) couple in router (TAR is switched in selected target, Target Access Router), to mobility anchor point (MAP, Mobility Anchor Point) distributes quick Binding Update (FBU, Fast Binding Update) after the message, immediately to old couple in router (pAR, Previous Access Router) sends context transfer trigger request (CTAR, Context Transfer Activate Request), inform to switch and be about to take place, trigger it to new couple in router (nAR, New Access Router) transmission context, CTAR message comprises context type and new couple in router (nAR) information that requirement is shifted.
B) mobile node (MN) distributes after quick Binding Update (FBU) message, promptly predicted switching, according to coordination strategy, compressive state is rolled back to the one-level compressive state, this moment is from really beginning two layers of switching also for some time, thereby guaranteed that compressive state belongs to non-secondary compressive state when switching.
C) after old couple in router (nAR) receives context transfer trigger request (CTAR) message, also foreseen imminent switching, equally according to coordination strategy with the compressive state rollback, ready for context transfer simultaneously.
D) old couple in router (nAR) utilizes two layers of trigger mechanism, when perceiving mobile node (MN) with the link disconnection, immediately current old couple in router (nAR) end compression/de-compression context is sent on the new couple in router (nAR), two layers of switching meanwhile take place.
E) new couple in router (nAR) is if end receives context transfer data piece (CTD, Context Transfer Data) message, if do not meet with an accident, current compressive state is the one-level compressive state, installs hereinafter on new couple in router (nAR).
F) new couple in router (nAR) is replied (CTDR, Context Transfer Data Reply) message to old couple in router (nAR) transmission context transfer and is informed that context transfer finishes.
G) after mobile node (MN) is connected to new link, send unsolicited neighbor advertisement (UNA, Unsolicited Neighbor Advertisement) message, and inform the bag that it does not receive to new couple in router (nAR).
H) new couple in router (nAR) is analyzed unsolicited neighbor advertisement (UNA) message, find the bag of losing in the buffer memory, and utilize mounted compressed context to compress, and be passed to mobile node (MN), begin the one-level compressive state compressed package of decompress(ion) simultaneously from mobile node (MN).
Can see that from flow process the real-time context that the present invention proposes shifts thought and is: the context transfer triggering is divided into two steps,
At first, mobile node (MN) notifies old couple in router (pAR) to be ready to context transfer after predicting switching;
Secondly, old couple in router (pAR) perceives to switch and starts the context transfer process when being about to take place.
In addition, mobile node (MN) and old couple in router (pAR) end are when sending and receiving context transfer trigger request (CTAR) message, judge current compressive state, if secondary compressive state, then rollback of compressive state fully, robustness letter head compression (ROHC) process is in low compression state when taking place to guarantee to switch.The buffer memory that can also see new couple in router (nAR) end in the fast hierarchical MIPv6 mechanism effectively reduces packet loss, and is contextual synchronous after also having guaranteed to a certain extent to switch.
Above-mentioned concrete scheme has comprised a fast hierarchical mobile IP v 6 and a letter compressed context metastasis, wherein the former has solved the IP routing issue that the mobile node switching brings, the latter has realized switching the service status information Fast Reconstruction of back at ROHC, and these two problems are key points that seamless mobility is provided for mobile node.The present invention can really promote to switch transparent to ROHC, reduces out of service time, thereby realizes better seamless mobility.
Claims (6)
1. a letter compressed context transfer method during the Internet of Things formula of answering is in advance switched is characterized in that, comprises the steps:
Couple in router is switched in the selected target from candidate access router of steps A, mobile node, predict after switching will take place by two layers of trigger then, adopt fast hierarchical MIPv6 module notification context transfer protocol module to send context transfer message to old couple in router, old couple in router is ready to context to be used for transfer operation;
After step B, old couple in router and mobile node adopt separately two layers of trigger to obtain link disconnection information respectively, extracting required contextual information respectively from a robustness letter compression module separately shifts, old couple in router end transmits old compression/decompression contextual information to new couple in router end, enters next step;
Step C, when the context transfer of robustness letter head compression to new couple in router, the new on-link care-of address information that new couple in router will adopt fast hierarchical MIPv6 module to obtain is sent to the context transfer protocol module;
Step D, new couple in router carry out contextual information according to new on-link care-of address information to be upgraded, and the contextual information after will upgrading is installed in the robustness letter compression module;
Step e, after the context transfer process begins, old couple in router obtains the sequence number of last grouping of compressing with old compressed context, send it to new couple in router, after the context transfer process is finished, adopt this sequence number from the grouping of buffer memory, to find out next grouping at new couple in router end, and utilize new compressed context that it is compressed.
2. a letter compressed context transfer method during the Internet of Things according to claim 1 formula of answering is in advance switched is characterized in that: described old couple in router, mobile node, new couple in router comprise two layers of trigger, fast hierarchical MIPv6 module, context transfer protocol module, a robustness letter compression module respectively.
3. a letter compressed context transfer method during the Internet of Things according to claim 1 formula of answering is in advance switched is characterized in that: the concrete contextual information content that described old couple in router, mobile node shift is in a robustness letter compression module.
4. Internet of Things according to claim 1 is answered a letter compressed context transfer method in the formula switching in advance, it is characterized in that: the context type of described robustness letter head compression comprises that the compressed context reconciliation presses hereinafter; For upstream packet, what mobile node need upgrade is compressed context, and new couple in router need be the decompress(ion) context by what shift acquisition; For downlink grouped, what mobile node need upgrade is the decompress(ion) context, and new couple in router need be a compressed context by what shift acquisition.
5. a letter compressed context transfer method during the Internet of Things according to claim 1 formula of answering is in advance switched is characterized in that: in handoff procedure, do not cause packet loss and can obtain less time delay, then:
On old link, old couple in router and mobile node utilize old compressed context and old decompress(ion) context that last grouping of transmitting on the old link is compressed and decompress(ion) respectively before switching;
Switch the back on new link, new couple in router and mobile node utilize new compressed context and new explanation to press hereinafter respectively first grouping of transmitting on the new link is compressed and decompress(ion).
6. a letter compressed context transfer method during the Internet of Things according to claim 1 formula of answering is in advance switched, it is characterized in that: described two layers of trigger comprise that the old link between announcement mobile node and the old couple in router disconnects, and the announcement mobile node is connected with the new link establishment between the couple in router newly.
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Application publication date: 20110504 |