CN101383745B - Mobile IP dissolving scheme suitable for special scenes - Google Patents
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Abstract
The invention relates to a mobile IP solution applicable to special scenes, the solution is as follows: the movement locus and the time period of a moving entity is recorded, a couple-in router on the node-moving path creates neighbor cache information of the moving entity in advance, a series of configuration information of the moving entity is created on the moving entity and a hometown agent, once the moving entity encounters a two-step switch, the moving entity forwardly reads the address information and initiates login switch according to the current moment, and the hometown agent also reads the configuration information and updates the banding cache according to the moment information. The moving entity can obtain the movement locus and the time period according to the own movement law or by adopting the navigation determination function or the movement forecasting function of a GPS. During the process of switch, the basic movement IP solution, the NEMO (Network Mobility) solution, the hierarchical movement IP solution, the quick movement IP solution, and the like are available.
Description
Technical field
The present invention relates to the mobility supporting technology of mobile Internet, be meant a kind of mobile IP solution that is applicable to special scenes especially.Have the scene that movement law periodically or movement law can be surveyed at mobile entity, by initiatively switching, provide a kind of mobile IP solution of optimization, the entity that is used to train, bus etc. to have the special exercise rule provides mobile IP service.
Background technology
Mobile IP has separated the duality of Traditional IP address by the notion of introducing home address and Care-of Address, adopt home address to describe the identity of mobile node, and use Care-of Address to describe the position of mobile node, thereby for node provides the mobility support of network layer, make node in moving process, to keep and Correspondent Node between continuous communiction.
But problem such as it is big that current mobile IP technology exists handoff delay, and packet loss is serious has influenced the performance of top service.Some improvement projects based on mobile IP comprise that fast moving IP and level move appearance in succession such as IP, and these methods have been improved the performance of handoffs of mobile substantially IP to a certain extent.But, poor-performing under some special scenes.
Mobile IP (Mobile IP) mistake! Do not find Reference source.A mistake! Do not find Reference source.Be the mobility expansion of IP agreement, a kind of special IP routing mechanism is provided, routing a data packet to those may make mobile node to be connected on any link with a permanent IP address always on the mobile node that changes the position apace.Internet engineering duty group (IETF in 2003, Internet Engineering Task Force) is provided with four working groups, study the special problem in the Internet mobility respectively, promptly study terminal mobility is supported in IPv4 and the IPv6 network MIPv4 (Mobility for IPv4) and MIPv6 (Mobility for IPv6) working group, research signaling and network handover optimization MIPSHOP (MIPv6Signaling and Handoff Optimization) working group, and NEMO (Network Mobility) working group that the research subnet moves on mobile IP basis.Along with the fast development of information network technique, the especially appearance of some new network technology makes people to the demand of information variation take place all on content and obtain manner.In January, 2005, NEMO working group has proposed the RFC3963 mistake! Do not find Reference source.。This standard comes down to the expansion of MIPv6, has described the basic supported protocol of mobile subnetwork access Internet.Current research to mobile IP mainly around switch fast, take over seamlessly, aspect such as level route organizes work.FMIPv6 (Fast MIPv6) mistake! Do not find Reference source.In advance for mobile node disposes new Care-of Address NCoA (New Care-of-Address), former and later two couple in routers between make up tunnel simultaneously in conjunction with two layers of information, reduce and switch packet loss.HMIPv6 (Hierarchical MIPv6) mistake! Do not find Reference source.By mobility anchor point MAP (MobilityAnchor Point) is set at field network, the partial function of sharing home agent reduces the transmission of overall hand off signaling.These schemes mainly are by the reduction address configuration time, reduce the switching delay that the signaling transmission time reduces mobile node, thereby improve the performance of mobile IP.
The technical scheme of prior art one
A FMIPv6 mistake! Do not find Reference source.It is a kind of fast moving IP agreement of the IPv6 of being used for network.This agreement makes that mobile node MN can be in current sub network, by neighboring access point AP and the pre-configured Care-of Address of subnet prefix information that links to each other.MN can carry out router discovery back or whenever carry out this process.By detecting, can obtain [an AP-ID, AR-Info] two tuples, the subnet information that record AP and it are connected, MN detects motion fast with this information, and when being connected to the AP of an AP-ID by name, MN just may know information such as its prefix, IP address and the L2 information of associated new router, thereby make the pre-configured Care-of Address of MN, saved the address configuration delay.In addition, FMIPv6 also provides the forwarding mechanism of the buffer memory between a kind of couple in router, makes packet to transmit between former and later two routers, switches packet loss thereby reduce.The general work process of FMIPv6 is shown in Fig. 1 (a).
Suppose that mobile node MN (Mobile Node) originally is connected to preceding couple in router PAR (Previous Access Router), be moved then and be linked into new couple in router NAR (New Access Router), in this course, its message flow is as follows:
(1) mobile node MN (Mobile Node) is carried out in current location and is added access point AP (Access Point) discovery procedure in addition, the information of scanning neighbor AP, and send proxy router solicitation RtSolPr to PAR, the subnet prefix information of request neighbor AP;
(2) after PAR receives RtSolPr message, generate [AP-ID, AR-Info] two tuples, and it is included in replies to MN among the PrRtAdv;
(3) MN obtains adjacent couple in router AP and subnet prefix information thereof from PrRtAdv message, selecting a new AP and AR is NAP and NAR, according to a new Care-of Address NCoA of subnet prefix information configuration (New care-ofAddress), be placed in quick neighbor advertisement message FBU (Fast NeighborAdvertisement) message and send to PAR;
(4) after PAR receives quick Binding Update information FBU (Fast Update) message, take out NCoA and be placed on and send to NAR in switch acknowledgment message HI (Handover Acknowledge) message and carry out duplicate address detection DAD (DuplicateAddress Detection);
(5) after NAR receives HI message, the duplicate address detection result is sent to PAR by switch acknowledgment message Hack (Handover Acknowledge) message;
(6) PAR reads Hack message, in case NCoA completes successfully the duplicate address detection process, then send quick binding acknowledgement message FBack (Fast BindingAcknowledgment) and give MN and PAR, and be established to the tunnel of NAR, and begin to be cached to the packet of MN;
(7) NAR receives the tunnel that is established to PAR behind the FBack, and the packet that sends over from PAR of buffer memory;
(8) after MN leaves PAR and is linked into NAR, send quick neighbor advertisement message FNA (Fast Neighbor Advertisement) message, begin forwarding after NAR receives and change data into to MN;
(9) in case MN finish with the binding procedure of NAR promptly in the list of bindings of upgrading home agent HA (Home Agent), the original tunnel of NAR deletion then.
Said process is a pattern in advance, be that MN obtains Care-of Address in advance at PAR, but when MN disconnects before reason such as too fast is sending FBU because of translational speed when being connected with PAR, it is that MN is encapsulated in FBU in the FNA message and sends NAR that FMIPv6 then provides reaction pattern, send to FBU by NAR, detailed process is shown in Fig. 1 (b).
The shortcoming of prior art one
FMIPv6 provides a kind of fast switch over method, but it has the following disadvantages:
(1) need existing couple in router of expansion and mobile node function, lower deployment cost is higher;
(2) lack a kind of effective link layer triggers mechanism, can't accurately predict the switching instant of mobile node;
(3) lack a kind of effectively new couple in router choice mechanism, might cause waste of network resources.
The technical scheme of prior art two
A HMIPv6 mistake! Do not find Reference source.Be to come in the base growth of mobile IP.In basic mobile IP protocol, node is moved at every turn all needs to send Binding Update to its home agent and all Correspondent Nodes, this process will cause producing a large amount of logon messages in network, cause bigger registration round trip delay time, and these time delays will make to flexibly connect interrupts.For this reason, HMIPv6 has introduced the notion that level moves, and has increased mobility anchor point MAP carries out local home agent in some territories function.
Suppose that mobile node is linked into AR1, AR2, AR3 and AR4 successively in moving process, wherein AR1 and AR2 are positioned at the MAP1 territory, and AR3 and AR4 are positioned at the MAP2 territory.In said process, the message interaction process of employing HMIPv6 as shown in Figure 2.
In the time of in mobile node moves to a MAP territory, to obtain on-link care-of address LCoA (On-link Care-of Address) and regional care-of address RCoA (Regional Care-ofAddress) simultaneously, mobile node is registered with LCoA and MAP earlier, carries out Binding Update with RCoA and home agent and peer node then.The mobile node that on behalf of it, MAP will serve receives all bags, and encapsulation also directly is forwarded to these bags the current address of mobile node.If mobile node has changed its current address (LCoA) in the MAP territory, it only need register new address to MAP.Therefore, do not need to change the RCoA that registers on Correspondent Node and the home agent.Mobile node and Correspondent Node can keep the transparency that moves.MAP just is equivalent to the local home agent of mobile node when mobile node uses the RCoA address, and MAP uses the tunnel to send to the LCoA of mobile node after receiving packet.When mobile node switched between the MAP territory, mobile node needed first MAP registration, and then first HA registration.
The introducing of MAP notion makes when mobile node changes its three layers of accessing points in the MAP territory, only need carry out once local Binding Update to MAP.
The shortcoming of prior art two
HMIPv6 provides a kind of level mobility management mechanism, but it comes with some shortcomings:
(1) needs expansion router advertisement function, MAP function etc., have the difficult problem of disposing;
(2) the still big and protocol interaction flow process complexity of switching delay between the territory.
Summary of the invention
The objective of the invention is to avoid above-mentioned weak point of the prior art and a kind of mobile IP solution that is applicable to special scenes is provided,, protocol message excessive at the delay that existing mobile IP technology adopts passive handover mechanism to cause be problem such as complexity too, the present invention has proposed a kind of mobile IP solution that is applicable to special scenes in conjunction with the specific application scenarios of mobile IP.The present invention has the scene that movement law periodically or movement law can be surveyed at mobile entity, by initiatively switching, provides a kind of mobile IP solution of optimization, can be widely used in systems such as railway, bus, steamer.
Purpose of the present invention can reach by following measure:
A kind of mobile IP solution that is applicable to special scenes, its solution is as follows:
1. during initial configuration, obtain the movement locus and the time cycle of mobile entity, comprise mobile entity subnet information that successively inserts and the temporal information that inserts certain subnet, the couple in router on the node motion path is set up the neighbor cache information of mobile entity in advance;
2. generate a series of configuration informations of this mobile entity on mobile entity and home agent, the physical record mobile entity is gone up the IP address information of a certain moment employing on the way on mobile entity, record banding cache clauses and subclauses on home agent;
3. mobile entity in case send two layers of switching, then reads address information and initiatively initiates to switch registration process according to the current moment in moving process, and home agent also reads configuration information according to time information simultaneously, upgrades banding cache;
4. after upgrading banding cache, mobile entity can continue to communicate by letter with original Correspondent Node, and continues execution in step 3.
Obtain the running orbit of mobile entity and the method for time cycle, comprise in the characteristics of motion, employing GPS navigation measurement function and the employing moving projection function that writes down mobile entity one or more.
Mobile entity adopts mobile substantially IP method or NEMO scheme or level to move IP method or fast moving IP method etc. in handoff procedure.
The present invention has following advantage compared to existing technology: the features of movement that the method applied in the present invention is based on mobile entity under the special scenes is distributing IP address on movement locus in advance, the mobile detection time-delay, the address configuration that reduce in original mobile IP method postpone and the part message transmission delay, thereby improve the performance of switching.
Description of drawings
Fig. 1 (a) FMIPv6 message flow is pattern in advance
Fig. 1 (b) FMIPv6 message flow is pattern in advance
Fig. 2 level moves the IP message flow process
Fig. 3 particular flow sheet of the present invention
Fig. 4 handoff delay comparison diagram
Embodiment
The existing passive handover mechanism of mobile IP does not fit into application scenarioss such as railway, bus, the special character of these scenes is: the motion path of mobile entity be can survey be the next switching point of mobile entity be as can be known or changeless, the motion of mobile entity has following feature:
(1) motion mode is limited, and the motion mode of mobile entity is subject to the topology of running route.For example, train will travel along predefined route (railway).
(2) motion mode rule, relative rule of mobile entity motion mode and repetition.For example, the train mobile network generally travels according to identical path and stops at identical position (station), and run duration also is relatively stable and rule.
Based on above feature, the present invention utilizes the motion feature of special scenes to make up one mobile IP solution.
The present invention program's flow chart as shown in Figure 3, detailed process is as follows:
(1) during initial configuration, obtain the movement locus and the time cycle information of mobile entity, at least comprise subnet information and temporal information that inserts certain subnet or the like that mobile entity successively inserts, this information can obtain by the periodic running orbit of record mobile entity, perhaps obtain by the GPS navigation measurement function, perhaps, perhaps comprehensively adopt one or more methods to obtain by adopting the moving projection function to obtain.In addition, the couple in router on the node motion path is set up the information such as neighbor cache of mobile entity in advance;
(2) a series of configuration informations of this mobile entity of generation on mobile entity and home agent, the physical record mobile entity is gone up the IP address information of a certain moment employing on the way on mobile entity, record banding cache clauses and subclauses on home agent;
(3) mobile entity is in moving process, mobile node can be carried out mobile IP process, in case send two layers of switching, then reads address information and initiatively initiates to switch registration process according to the current moment, home agent also reads configuration information according to time information simultaneously, upgrades banding cache;
(4) after upgrading banding cache, mobile entity can continue to communicate by letter with original Correspondent Node, and continues execution in step 3.
The features of movement that the method applied in the present invention is based on mobile entity under the special scenes is distributing IP address on movement locus in advance, the mobile detection time-delay, the address configuration that reduce in original mobile IP method postpone and the part message transmission delay, thereby the performance of switching is provided.Fig. 4 has showed that the present invention constitutes with the time-delay of other schemes in handoff procedure.
Among the present invention, mobile entity can adopt mobile substantially IP or NEMO scheme in handoff procedure, also can adopt level to move improvement projects such as IP and fast moving IP.
Foregoing invention at special scenes mainly be at having the mobile entity that movement law periodically or movement law can be surveyed, be that local scene as can be known also can adopt the present invention to carry out performance optimization for the movement locus of mobile node.Obtain the running orbit of mobile entity and the method for time cycle, comprise in the characteristics of motion, employing GPS navigation measurement function and the employing moving projection function that writes down mobile entity one or more.The method of the fixedly characteristics of motion of record mobile entity: mainly be at the mobile entity with certain movement rule, as train, light rail, subway etc., the route of its motion and concrete time are relatively stable.Therefore, by observing its concrete time and relevant routing iinformation of obtaining through each subnet on the path.Adopt the GPS navigation measurement function: be primarily aimed at mobile entity,, and, show the movement locus of mobile entity by map according to set destination calculating stroke by the current location of accurate location mobile entity with GPS navigation function.Employing moving projection function mainly is based on the historical movement path of mobile entity, infers the method for the next position of mobile entity according to certain moving projection method.
Characteristic part of the present invention is: in conjunction with the pre-configured relevant information of the motion feature of mobile entity, reduced time-delays such as mobile detection time-delay and duplicate address detection, optimized performance of handoffs.
Claims (3)
1. mobile IP solution that is applicable to special scenes, it is characterized in that: its solution is as follows:
(1) during initial configuration, obtain the movement locus and the time cycle information of mobile entity, comprise mobile entity subnet information that successively inserts and the temporal information that inserts certain subnet, the couple in router on the node motion path is set up the neighbor cache information of mobile entity in advance;
(2) a series of configuration informations of this mobile entity of generation on mobile entity and home agent, the physical record mobile entity is gone up the IP address information of a certain moment employing on the way on mobile entity, record banding cache clauses and subclauses on home agent;
(3) mobile entity in case send two layers of switching, then reads address information and initiatively initiates to switch registration process according to the current moment in moving process, and home agent also reads configuration information according to time information simultaneously, upgrades banding cache;
(4) after upgrading banding cache, mobile entity can continue to communicate by letter with original Correspondent Node, and continues execution in step (3).
2. a kind of mobile IP solution that is applicable to special scenes as claimed in claim 1, it is characterized in that: obtain the running orbit of mobile entity and the method for time cycle information, comprise the characteristics of motion that writes down mobile entity or adopt the GPS navigation measurement function, perhaps adopt the moving projection function, one or more in the above-mentioned several method of perhaps comprehensive employing.
3. a kind of mobile IP solution that is applicable to special scenes as claimed in claim 1 or 2 is characterized in that: mobile entity adopts mobile substantially IP method or NEMO scheme or level to move IP method or fast moving IP method in handoff procedure.
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| CN101932059B (en) * | 2010-08-02 | 2012-11-14 | 清华大学深圳研究生院 | Network-based navigation assisted fast three-layer switching method in V2I communication |
| CN102869062B (en) * | 2011-07-07 | 2016-05-18 | 中国科学院上海高等研究院 | A kind of WLAN rail communication system method of switching fast that realizes |
| CN108291811B (en) * | 2015-11-26 | 2021-07-09 | 华为技术有限公司 | Method and apparatus for switching roadside navigation units in a navigation system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6636498B1 (en) * | 1999-01-08 | 2003-10-21 | Cisco Technology, Inc. | Mobile IP mobile router |
| CN1645966A (en) * | 2005-01-14 | 2005-07-27 | 重庆邮电学院 | Determining method for two-layer message triggering time in mobile IP |
| CN1949727A (en) * | 2005-10-12 | 2007-04-18 | 北京邮电大学 | Method for implementing seamless switching by preconfiguration mobile IPv6 mobile node transmitting address |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6636498B1 (en) * | 1999-01-08 | 2003-10-21 | Cisco Technology, Inc. | Mobile IP mobile router |
| CN1645966A (en) * | 2005-01-14 | 2005-07-27 | 重庆邮电学院 | Determining method for two-layer message triggering time in mobile IP |
| CN1949727A (en) * | 2005-10-12 | 2007-04-18 | 北京邮电大学 | Method for implementing seamless switching by preconfiguration mobile IPv6 mobile node transmitting address |
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