CN102938919B - The routing optimization method of selectable distributed mobile management - Google Patents
The routing optimization method of selectable distributed mobile management Download PDFInfo
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Abstract
A kind of routing optimization method of selectable distributed mobile management, it is the option that a proxy mobile IPv 6 is set, can in the foundation of session and keep-process, send along with entrained by each proxy mobile IPv 6 message, so that router is selected according to the configuration feature of user's request or local router and performs corresponding route optimization strategy, bring the variation support in optimisation strategy for proxy mobile IPv 6 network, to make network self for support refinement and the optimization more of different application simultaneously.This option be one adjustable length, comprise 0, one or more " Type-Length-Value " the mobility option of encoding, its total word length is the integral multiple of 8 characters; This territory and this coded format defer to the requirements of 6.2 joints of RFC3775, ignore and skip unrecognizable option number and option content to enable Mobile Access Gateway.The present invention can be applicable to plurality of application scenes, has good popularizing application prospect.
Description
Technical field
The present invention relates to a kind of selectable distributed mobile management routing optimization method, exactly, relate to one and relate to mobile IP v 6 (MobileIPv6) and proxy mobile IPv 6 (ProxyMobileIPv6) agreement, by carrying the message option of Mobile IP, make the anchor point (couple in router) of BlueDrama can carry out the identification of routing optimality demand to the new session initiated, and then in fast mobile terminal process, different routing optimality strategies is used to session and realizes the polynary and controlled routing optimization method of optimisation strategy, belong to the technical field of multimedia communication,
Background technology
The route of traditional IP bag and service Quality Control Technology are only the five-tuple information that analyzing IP packet header comprises source address, destination address, source port, destination interface and protocol type, to determine the essential information of flow.The information that conventional IP routers also just obtains according to five-tuple realizes the guarantee of route to a certain degree and service quality.But along with the universal of mobile device and the extensive use of mobile network, the movement of mobile device between diverse access point, usually can break the rule of original fixed network session five-tuple.And Mobile IP can support the use of mobile terminal under situation of movement, during utilize home agent, Foreign Agent and address mapping relation to solve new address that fast mobile terminal obtains, how to keep the problem of already-existing session.
Mobile IPv 6 takes full advantage of IPv6 agreement and supports ambulant inherence.First, router indicates it and whether can serve as local agent in router broadcast message.Allow to there is multiple local agent in same subnet, mobile node can be registered to any one local agent.Local agent preserves the home address of mobile node and the table of comparisons of Care-of Address, after it receives the message sending to mobile node, gives mobile node according to this table of comparisons message repeating.In addition, after mobile node receives the message that other main frames send, using Care-of Address as source address in response message, and the home address of mobile node to incidentally be gone up; The subsequent packet just address for the purpose of the Care-of Address of mobile node of other main frames.But attach source routing and select header, header content is the home address of mobile node.The object of this mechanism is used to be ensure that mobile node can not lose message in moving process.Finally, redirection process is defined in IPv6.When mobile node is at handover between cells, mobile node re-registers successfully, and redirection message should be sent out to original base station in base station, enables the message devious of route in handoff procedure pick up mobile node.
Along with the development of mobile IP technology and the promotion of IPv6 agreement, the network equipment is compared to terminal, and support all to assume responsibility for more function for the foundation of session, maintenance and position, proxy mobile IPv 6 agreement is arisen at the historic moment.Proxy mobile IPv 6 agreement is a kind of network localized mobility management agreement, compared with other mobile IPv 6 protocols (as mobile IPv 6 protocol, transferring IPv6 agreement, hierarchical IPv6 agreement fast), proxy mobile IPv 6 agreement does not need mobile node to participate in any decision-making relevant to movement, network entity is responsible for the movement following the tracks of mobile node, and initiates and mobile relevant signalling.In addition, IPv6 address need not be changed when this agreement also ensures that mobile node is roamed in whole territory.These characteristics, for operator, can improve it to network-based control ability.And for mobile subscriber, then can reduce the design complexities of terminal protocol stack, thus reduce device resource and energy ezpenditure.
Be subject to the impact of communication network, the deployment of mobile Internet is more tending towards centralized management.This form depends on an independent mobile anchor node and carries out mobility support to terminal equipment, but this form exists following three problems usually:
1, route non-optimal, when the server particularly in content distributing network is pushed to network edge, cause the propagation delay time between mobile subscriber and content server very large, load unnecessary in core net is also too much.
2, extensibility is bad, and because the quantity of anchor node increases along with the growth of mobile subscriber's quantity, along with the increase of business, mobile anchor node can be more and more crowded.
3, mobility support carries out according to " each node " instead of " each stream ", and this is impossible by causing " unloading " of some flow to become.People can not expect that the optimization ability of route is present in each Correspondent Node.When all from mobile node and mail to the flow of mobile node all must through central anchor node, afore-mentioned is just degrading.Particularly when the communication of mobile node is created in fixed position.
In order to solve centralized management Problems existing, the thought of distributed mobile management starts to ferment formation in the industry cycle.The purport of distributed mobile management is the framework based on mobile IP v 6 and proxy mobile IPv 6, anchor node in centralized management is split for the management function of terminal and data retransmission function and comes, make anchor node only be responsible for the management function of terminal, data retransmission function is placed on the couple in router being more closely connected to network edge.Anchor node issues prefix or address by couple in router to terminal, and the data traffic mailing to terminal will directly be forwarded by couple in router, the anchor node of the responsible terminal management function that no longer detours.Alleviating the load of data processing like this with regard to the anchor node for being responsible for mobile management, increasing extensibility, reducing the possibility of Single Point of Faliure.Meanwhile, because anchor node has broken away from data retransmission function, make it in management function, have greater flexibility, the routing optimality possible for future and flow control provide larger space.
Summary of the invention
In view of this, the object of this invention is to provide a kind of routing optimization method of selectable distributed mobile management, network can be needed according to it the application of the existing and following mobile Internet the method and feature is selected and the optimisation strategy performing differentiation.Because the feature of mobile Internet application and varying to the demand of service quality, there is the routing optimality solution of " optimum " hardly, take unified optimisation strategy obviously can not meet the demand of application itself.In addition, be subject to the impact of possible network topology, different couple in routers may be unwilling as the anchor node of session because of certain cause specific, or different application may be avoided intentionally carry out grappling to session on current couple in router.Consider based on this point, the present invention to have given a definition a mobility option at proxy mobile IPv 6 framework, for client to routing optimality strategy needed for it of couple in router and anchor point request, also can be used for the negotiation carrying out routing optimality strategy between couple in router.
In order to achieve the above object, the invention provides a kind of routing optimization method of selectable distributed mobile management, it is characterized in that: because of multiple optimisation strategy that network has coexisted simultaneously, therefore the option of a proxy mobile IPv 6 is set, can in the foundation of session and keep-process, send along with entrained by each proxy mobile IPv 6 message, so that router is selected according to the configuration feature of user's request or local router and performs corresponding route optimization strategy, bring the variation support in optimisation strategy for proxy mobile IPv 6 network simultaneously, to make network self for support refinement and the optimization more of different application, described option is an adjustable length territory, and its total word length is the integral multiple of 8 characters, this territory comprises 0, one or more " Type-Length-Value " the mobility option of encoding, and this coded format defers to the requirements of 6.2 joints of RFC3775, ignores and skip unrecognizable option number and option content to enable Mobile Access Gateway.
Described option comprises following each territory and connotation is:
Type, word length 8 bit is option number, is organized distribute its numerical value by IANA;
Length, word length 8 bit, be option total length, unit is 1 character;
Reserved, word length 8 bit, for retaining item;
PrefixLength, word length 8 bit is the effective length of the prefix that comprises in option or address Prefix/Address;
OptimizingOption, word length 16 bit, be strategy number, its numerical value organizes Unified number by setting, to make couple in router equipment or anchor point device unify process to this codomain, avoids confusion occurs;
Period, word length 16 bit is the cycle, and its meaning under Different Strategies is had nothing in common with each other;
Prefix/Address, word length is adjustable, for setting strategy lower required 0, one or more prefixes or address.
Described option is used for following six kinds of scenes:
(1) Dialog request set up temporally carries out renewal and the switching of anchor point:
This session, according to own characteristic, does not need extremely strong real-time and high-quality routing optimality, but has dependence to time-sensitive or to the time; This scene setting OptimizingOption territory is " TIME " pattern, and Period is the time cycle, namely every setting-up time in seconds, upgrades the anchor node of a session; If need specific prefix to support, then indicate in Prefix/Address;
(2) Dialog request set up often just upgrades an anchor point through the couple in router of set point number:
This session, according to own characteristic, does not need extremely strong real-time and high-quality routing optimality, but along with the continuous increase of moving range, conversation continuity is declined; This scene setting OptimizingOption territory is " JUMP " pattern, and namely often just upgrade the anchor node of a session through the couple in router of set point number, Period is renewal frequency; If need specific prefix to support, then indicate in Prefix/Address;
(3) Dialog request set up avoids the couple in router of setting prefix or address as session anchor point:
This session, according to own characteristic, does not need extremely strong real-time and high-quality routing optimality, but the grappling session because of certain reason attempt avoidance certain or some couple in router; This scene setting OptimizingOption territory is " AVOID " pattern, on the couple in router setting prefix or address, namely do not upgrade the anchor node of this session, and in Prefix/Address, indicate these prefixes requiring to avoid or address; Period in this pattern is inoperative, therefore its numerical value is left in the basket when couple in router or terminal processes;
(4) session of setting up is required the switching not carrying out anchor point in the prefix or address of setting:
When fast mobile terminal is in the range of signal of certain couple in router, this couple in router because of certain reason not as this session anchor point and be transmitting data flow; This scene setting OptimizingOption territory is " REFUSE " pattern, i.e. current access route refusal grappling session, a processing forward request; Period is the time limit of this refusal requirement, works as Period=FFFF, shows permanent refusal; Now, this option is sent to previous couple in router, for protocol negotiation by current Access Router;
(5) session of setting up all more new session anchor point when each mobile:
This session is according to own characteristic, do not need extremely strong real-time and high-quality routing optimality, but along with the continuous increase of moving range, conversation continuity is declined, therefore after moving to current Access Router, according to the anchor node of the probable value Stochastic choice whether more new session arranged; at every turn This scene setting OptimizingOption territory is " RANDOM " pattern, and Period is the update probability value of this session anchor node;
(6) access between route and carry out policy conferring, for being confirmed whether as session setup specific policy:
Carry out policy conferring according to himself ability between couple in router, this scene setting OptimizingOption territory is " DISCUSS " pattern, and often kind that indicates couple in router tactful concrete function and parameter thereof.
The various different modes in the OptimizingOption territory in described six kinds of scenes are all that the respective code of employing 16 bit word length represents.
In described scene (5), represent that the describing method of the update probability value Period of session anchor node is; Start until the rightmost side with position, the leftmost side in its word length 16 bit, be respectively the 1st after binary digit decimal point until after decimal point the 16th; Couple in router or mobile terminal according to network configuration or session need this Period numerical value is set, when mobile terminal moves to current Access Router place, this couple in router judges whether one of its stochastic generation probable value between 0 to 1 is not more than Period numerical value, if so, then this couple in router Session Anchor that mobile terminal is being continued in this locality; Otherwise this couple in router only carries out data retransmission operation, and the session of this terminal of not grappling.
The alternative of the routing optimization method of described distributed mobile management carries out purposive selection in optimisation strategy category that is existing or that confirmed by International Organization for standardization, and provide extending space for the novel strategy that occur from now on and application.
Compared with prior art, its innovation advantage is the improvement at least with following two aspects: first in the present invention, and the prior art solution that just independence that proposes is feasible based on the consideration of certain specific factor usually, can not take into account many-sided factor simultaneously.Secondly, prior art is generally divided into two classes: a class is can some other method compatible, and another kind of is other method incompatible.Not possess the inventive method can consult access route and make multiple optimisation strategy coexist in the characteristic of network simultaneously.
According to current network flow statistic numeral, there is the data flow of number of different types in mobile Internet, due to different application and the own services content of software entity and the difference of feature, its requirement for service quality differs greatly.If adopt the optimisation strategy of same " optimum " in theory and method very unrealistic, and, the unification of optimization method, just mean that router manufacturer must realize the height of its hardware configuration, i.e. relevant parameter unanimously, these situations all do not meet liberty of commerceization development and the principle of competing yet.In addition, different optimisation strategy is all for different application scenarioss and service function usually, and service function itself also can along with social development, technological progress and produce unpredictable change.Such as video data is the heavy load phenomenon that network brings, and very likely can be solved in future along with the development of the coding of application layer, compress technique, and the unified optimisation strategy of thus carrying out for transmission of video service now will become futile.In fact, along with the nearly 2 years developments of video coding technique and improving constantly of compression efficiency, the developing direction of WeiLai Technology is also manifested gradually.The object of the inventive method wishes to make network layer routing optimality strategy can symbiotic co-existence, and provide optimum optimisation strategy for difference service, and make the anchor point of responsible terminal management and data retransmission, access routing device effectively can reduce unnecessary process operation.
In addition, as mentioned above, because routing optimality strategy is among development, for the network equipment that magnanimity is disposed, a New Policy is often had to be unpractical with regard to upgrading the respective protocol of all-network equipment; And it is equally also unpractical that often kind of New Policy will be made can both to carry out forward compatibility to original old strategy.Therefore, the development of routing optimality scheme should be the process of an increment type, external hanging type, should have a kind of mechanism like this: can either the renewal of support policy, also makes New Policy can coexist with old strategy simultaneously.Further, no matter whether its compatibility, and both all can individually for special services provides support.The inventive method can meet above-mentioned requirements: the New Policy being only required to be generation provides a standard strategy numbering, and the symbiosis when incompatible of itself and Existing policies just can be made to deposit together.Meanwhile, the present invention can also support the independence support for session dissimilar in each terminal respectively, is " each stream " and provides different service strategies respectively, but not provides unified optimisation strategy for each terminal.
In sum, the present invention is the variation support that proxy mobile IPv 6 network brings in optimisation strategy, makes network itself for support refinement and the optimization more of different application, has good popularizing application prospect.
Accompanying drawing explanation
Fig. 1 is the choice format schematic diagram of the proxy mobile IPv 6 in routing optimization method of the present invention.
Fig. 2 is the sequential flow chart of the first application scenarios of routing optimization method of the present invention.
Fig. 3 is the sequential flow chart of the second application scenarios of routing optimization method of the present invention.
Fig. 4 is the sequential flow chart of the third application scenarios of routing optimization method of the present invention.
Fig. 5 is the sequential flow chart of the 4th kind of application scenarios of routing optimization method of the present invention.
Fig. 6 is the sequential flow chart of the 5th kind of application scenarios of routing optimization method of the present invention.
Fig. 7 is the sequential flow chart of the 6th kind of application scenarios of routing optimization method of the present invention.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly, below in conjunction with the application scenarios of drawings and Examples, the present invention is described in further detail.
Because network has coexisted multiple optimisation strategy simultaneously, therefore the routing optimization method of the selectable distributed mobile management of the present invention is the option arranging a proxy mobile IPv 6, can in the foundation of session and keep-process, send along with entrained by each proxy mobile IPv 6 message, so that router is selected according to the configuration feature of user's request or local router and performs corresponding route optimization strategy, bring the variation support in optimisation strategy for proxy mobile IPv 6 network simultaneously, to make network self for support refinement and the optimization more of different application.
See Fig. 1, introduce the form of this option: it is one and comprises 0, one or more " Type-Length-Value " the adjustable length territory of mobility option of encoding, and total word length is the integral multiple of 8 characters; And this coded format defers to the requirement of 6.2 joints of RFC3775, ignores and skip unrecognizable option number and option content to enable Mobile Access Gateway.This option comprises following each territory and connotation is:
Type is option number, word length 8 bit, is organized distribute its numerical value by IANA;
Length is option total length, word length 8 bit, and unit is 1 character;
Reserved is for retaining item, word length 8 bit;
The effective length that PrefixLength is the prefix that comprises in option or address Prefix/Address, word length 8 bit;
OptimizingOption is strategy number, word length 16 bit, and its numerical value organizes Unified number by setting, to make couple in router equipment or anchor point device unify process to this codomain, avoids confusion occurs;
Period is the cycle, word length 16 bit, and its meaning under Different Strategies is had nothing in common with each other;
Prefix/Address is setting strategy lower required 0, one or more prefixes or address, and word length is adjustable.
Inventions have been and repeatedly implement test, the emulation embodiment below in conjunction with six kinds of different application scenes illustrates the operation principle of the inventive method.
See Fig. 2, introduce the specific implementation process of the inventive method embodiment in the 1st kind of application scenarios:
(1) mobile terminal is registered to management node by the couple in router 1 at current place.
(2) mobile terminal is for Correspondent Node initiation session, sends request message to couple in router 1, requires to carry out routing optimality with TIME model-based optimization strategy, and sets Period value.
(3) management node receives this message, record relevant entry, and marks the optimisation strategy that this session is TIME pattern, and sets Period value.
(4) management node informs Correspondent Node position (i.e. couple in router 3) to couple in router 1, and mobile terminal sends to the packet of Correspondent Node to encapsulate by couple in router 1, after sending to couple in router 3 by tunnel.Data division by bag decapsulation, and is sent to Correspondent Node by couple in router 3.Correspondent Node returns corresponding data bag with reverse path and mode again, session establishment.Now, mobile terminal and Correspondent Node can mutual transceiving datas each other simultaneously by couple in router 1 and 3.
(5) mobile terminal starts roaming, moves in the scope of couple in router 2.Now, Period is not then.Session is maintained by tunnel style.The route of the data process sent from Correspondent Node is: Correspondent Node → couple in router 3 → couple in router 1 → couple in router 2 → mobile terminal.The route of the data process sent from mobile terminal is: mobile terminal → couple in router 2 → couple in router 1 → couple in router 3 → Correspondent Node.In each figure of Fig. 2 ~ Fig. 7, single lined arrows represents that hollow frame arrow expression tunnel form sends packet by common route-pattern transmission packet.
(6) through after a while, then, management node controls couple in router and initiates routing optimality Period: couple in router 1 sends packet to couple in router 2, informs address and the port information of its access route 3; Couple in router 1 sends packet to couple in router 3, informs address and the port information of its access route 2.Then, send the path of data no longer through couple in router 1, and directly between couple in router 2 and couple in router 3, adopt tunnel style to transmit, tunnel re-establishes.The data interaction of mobile terminal and Correspondent Node has been come by the communication of couple in router 2 with couple in router 3.
(7) session proceeds, until terminate.As roamed into next couple in router region, repeat step (5) and (6).
See Fig. 3, introduce the specific implementation process of the inventive method embodiment in the 2nd kind of application scenarios:
(1) mobile terminal is registered to management node by the couple in router 1 at current place.
(2) mobile terminal is for Correspondent Node initiation session: first send request message to couple in router 1, require to carry out routing optimality with JUMP model-based optimization strategy, and to set Period value be 1, namely every a couple in router again grappling session once.
(3) management node receives this message, record relevant entry, and to mark this session be JUMP model-based optimization strategy, and to set Period value be 1, Jump value is 0.
(4) with reference to the content of operation of the step (4) in the 1st kind of application scenarios, session establishment.
(5) mobile terminal starts roaming, moves in the scope of couple in router 3.Now, from management node, couple in router 3 knows that this session is JUMP mode session, and Jump is current is 0, is not equal to the Period value be set, and characterizes and does not need to switch session anchor node.Couple in router 3 transmission comprises the message of routing optimality option to management node, and the Jump value of this session is added 1, and session is maintained by tunnel style.The data sent from Correspondent Node are through following route: Correspondent Node → couple in router 4 → couple in router 1 → couple in router 3 → mobile terminal; The data sent from mobile terminal are through following route: mobile terminal → couple in router 2 → couple in router 1 → couple in router 3 → Correspondent Node.
(6) through after a while, mobile terminal roaming is in the scope of couple in router 2, from management node, couple in router 2 knows that this session is JUMP mode session, and Jump is current is 1, equals the Period value be set, and characterizes and needs to switch session anchor node.With reference to the initiation process of step (6) routing optimality in the 1st kind of scene, management node controls couple in router and initiates routing optimality, and tunnel re-establishes.The data interaction of mobile terminal and Correspondent Node has been come by the communication of couple in router 2 with couple in router 4.
(7) session proceeds, until terminate.As roamed into next couple in router region, repeat step (5) and (6).
See Fig. 4, introduce the specific implementation process of the inventive method embodiment in the 3rd kind of application scenarios:
(1) mobile terminal is registered to management node by the couple in router 1 at current place.
(2) mobile terminal is for Correspondent Node initiation session: first send request message to couple in router 1, require to carry out routing optimality with AVOID model-based optimization strategy, and set Prefix value as IPv6 prefix p, namely when moving to the couple in router region that prefix is p, the grappling do not conversated.
(3) management node receives this message, record relevant entry, and to mark this session be AVOID model-based optimization strategy, and sets Prefix value as p.
(4) with reference to the content of operation of the step (4) in the 1st kind of application scenarios, session establishment.
(5) mobile terminal starts roaming, moves to by within the scope of the couple in router avoided.Now, known that this session is AVOID pattern by the couple in router avoided from management node, the Prefix of avoidance is p, identical with the Prefix of self current configuration, and characterize and do not need to switch session anchor node, session is maintained by tunnel style.The data sent from Correspondent Node are through following route: Correspondent Node → couple in router 4 → couple in router 1 → by the couple in router → mobile terminal avoided; The data sent from mobile terminal are through following route: mobile terminal → and by the couple in router → couple in router 1 → couple in router 4 → Correspondent Node avoided.
(6) through after a while, mobile terminal roaming is in couple in router 2 scope, from management node, couple in router 2 knows that this session is AVOID pattern, and the Prefix of avoidance is p, be not inconsistent with the Prefix of self current configuration, characterize and need to switch session anchor node.With reference to the initiation process of step (6) routing optimality in the 1st kind of application scenarios, management node controls couple in router and initiates routing optimality, and tunnel re-establishes.Mobile terminal and the data interaction of Correspondent Node have been communicated with couple in router 4 by couple in router 2.
(7) session proceeds, until terminate.As roamed into next couple in router region, repeat step (5) and (6).
See Fig. 5, introduce the specific implementation process of the inventive method embodiment in the 4th kind of application scenarios:
(1) mobile terminal is registered to management node by the couple in router 1 at current place.
(2) mobile terminal is for Correspondent Node initiation session: first send request message to couple in router 1, require to carry out routing optimality with TIME model-based optimization strategy, and to set TIME value be 0, namely whenever moving in a couple in router region, the grappling conversated immediately.
(3) management node receives this message, record relevant entry, and to mark this session be TIME model-based optimization strategy, and to set TIME value be 0.
(4) with reference to the content of operation of the step (4) in the 1st kind of application scenarios, session establishment.
(5) mobile terminal starts roaming, moves in couple in router 2 scope.Now, known that this session is TIME pattern by the couple in router avoided from management node, session is maintained by tunnel style.The data sent from Correspondent Node are through following route: Correspondent Node → couple in router 3 → couple in router 1 → couple in router 2 → mobile terminal; The data sent from mobile terminal are through following route: mobile terminal → couple in router 2 → couple in router 1 → couple in router 3 → Correspondent Node.In figure, single lined arrows represents that hollow frame arrow expression tunnel form sends packet by common route-pattern transmission packet.
(6) couple in router 1 initiates routing optimality request to couple in router 2 and couple in router 3.Couple in router 2 initiates to the couple in router 3 of couple in router 1 and Correspondent Node the option containing REFUSE, and the Period thresholding set in option is FFFF, show permanent refusal, notice its refusal grappling session, do not carry out if scene 1 the 6th step is by Optimum Operation.Session anchor point does not change, and packet institute via line is constant.
(7) session proceeds, until terminate.As roamed into next couple in router region, repeat step (5) and (6).
See Fig. 6, introduce the specific implementation process of the inventive method embodiment in the 5th kind of application scenarios:
(1) mobile terminal is registered to management node by the couple in router 1 at current place.
(2) mobile terminal is for Correspondent Node initiation session: first send request message to couple in router 1, require to carry out routing optimality with RANDOM model-based optimization strategy, and set Period value as 8FFF(and represent 0.5), namely when the random number that current Access Router produces is greater than 0.5, the grappling conversated.
(3) management node receives this message, record relevant entry, and to mark this session be RANDOM model-based optimization strategy, and to set Period value be 0.5.
(4) with reference to the content of operation of the step (4) in the 1st kind of application scenarios, session establishment.
(5) mobile terminal starts roaming, moves in couple in router 3 scope.Now, from management node, couple in router 3 knows that this session is RANDOM pattern, Period value is 0.5, generation one is immediately greater than 0, is less than the random number of 1, and this random number is less than 0.5(such as: random number is 0.4), then do not need to switch session anchor node, session is maintained by tunnel style.The data sent from Correspondent Node are through following route: Correspondent Node → couple in router 4 → couple in router 1 → couple in router 3 → mobile terminal; The data sent from mobile terminal are through following route: mobile terminal → couple in router 3 → couple in router 1 → couple in router 4 → Correspondent Node.
(6) through after a while, mobile terminal roaming is in couple in router 2 scope, from management node, couple in router 2 knows that this session is RANDOM pattern, Period value is 0.5, generation one is immediately greater than 0, is less than the random number of 1, and this random number is greater than 0.5(such as: random number is 0.6), then need to switch session anchor node.Control couple in router with reference to step (6) management node in the 1st kind of application scenarios and initiate routing optimality, tunnel re-establishes.Mobile terminal and the data interaction of Correspondent Node have been communicated with couple in router 4 by couple in router 2.
(7) session proceeds, until terminate.As roamed into next couple in router region, repeat step (5) and (6).
See Fig. 7, introduce the specific implementation process of the inventive method embodiment in the 6th kind of application scenarios:
(1) couple in router 1 sends request to management node, inquires the prefix of other couple in router or address prefix or address information.
(2) management node returns the prefix of other couple in router or address prefix or address information to couple in router 1.
(3) couple in router 1 sends the message with DISCUSS option according to the prefix returned or address information to couple in router 2, inquires its optimisation strategy code supported.
(4) couple in router 2 returns message with DISCUSS option to couple in router 1, records the code of the routing optimality strategy himself supported in this message.
In a word, multiple emulation embodiment tests of the inventive method are all successful, achieve goal of the invention.
Claims (3)
1. the routing optimization method of a selectable distributed mobile management, it is characterized in that: because of multiple optimisation strategy that network has coexisted simultaneously, therefore the option of a proxy mobile IPv 6 is set, can in the foundation of session and keep-process, send along with entrained by each proxy mobile IPv 6 message, so that router is selected according to the configuration feature of user's request or local router and performs corresponding route optimization strategy, bring the variation support in optimisation strategy for proxy mobile IPv 6 network simultaneously, to make network self for support refinement and the optimization more of different application, described option is an adjustable length territory, and its total word length is the integral multiple of 8 characters, this territory comprises 0, one or more " Type-Length-Value " the mobility option of encoding, and this coded format defers to the requirements of 6.2 joints of RFC3775, ignores and skip unrecognizable option number and option content to enable Mobile Access Gateway,
Described option is used for following six kinds of scenes:
(1) Dialog request set up temporally carries out renewal and the switching of anchor point:
This session, according to own characteristic, does not need extremely strong real-time and high-quality routing optimality, but has dependence to time-sensitive or to the time; This scene setting OptimizingOption territory is " TIME " pattern, and Period is the time cycle, namely every setting-up time in seconds, upgrades the anchor node of a session; If need specific prefix to support, then indicate in Prefix/Address;
(2) Dialog request set up often just upgrades an anchor point through the couple in router of set point number:
This session, according to own characteristic, does not need extremely strong real-time and high-quality routing optimality, but along with the continuous increase of moving range, conversation continuity is declined; This scene setting OptimizingOption territory is " JUMP " pattern, and namely often just upgrade the anchor node of a session through the couple in router of set point number, Period is renewal frequency; If need specific prefix or address to support, then indicate in Prefix/Address;
(3) Dialog request set up avoids the couple in router of setting prefix or address as session anchor point:
This session, according to own characteristic, does not need extremely strong real-time and high-quality routing optimality, but the grappling session because of certain reason attempt avoidance certain or some couple in router; This scene setting OptimizingOption territory is " AVOID " pattern, on the couple in router setting prefix or address, namely do not upgrade the anchor node of this session, and in Prefix/Address, indicate these prefixes requiring to avoid or address; Period in this pattern is inoperative, therefore its numerical value is left in the basket when couple in router or terminal processes;
(4) session of setting up is required the switching not carrying out anchor point in the prefix or address of setting:
When fast mobile terminal is in the range of signal of certain couple in router, this couple in router because of certain reason not as this session anchor point and be transmitting data flow; This scene setting OptimizingOption territory is " REFUSE " pattern, i.e. current access route refusal grappling session, a processing forward request; Period is the time limit of this refusal requirement, works as Period=FFFF, shows permanent refusal; Now, this option is sent to previous couple in router, for protocol negotiation by current Access Router;
(5) session of setting up all more new session anchor point when each mobile:
This session is according to own characteristic, do not need extremely strong real-time and high-quality routing optimality, but along with the continuous increase of moving range, conversation continuity is declined, therefore after moving to current Access Router, according to the anchor node of the probable value Stochastic choice whether more new session arranged; at every turn This scene setting OptimizingOption territory is " RANDOM " pattern, and Period is the update probability value of this session anchor node;
(6) access between route and carry out policy conferring, for being confirmed whether as session setup specific policy:
Carry out policy conferring according to himself ability between couple in router, this scene setting OptimizingOption territory is " DISCUSS " pattern, and often kind that indicates couple in router tactful concrete function and parameter thereof;
Described option comprises following each territory and connotation is:
Type, word length 8 bit is option number, is organized distribute its numerical value by IANA;
Length, word length 8 bit, be option total length, unit is 1 character;
Reserved, word length 8 bit, for retaining item;
PrefixLength, word length 8 bit is the effective length of the prefix that comprises in option or address Prefix/Address;
OptimizingOption, word length 16 bit, be strategy number, its numerical value organizes Unified number by setting, to make couple in router equipment or anchor point device unify process to codomain, avoids confusion occurs;
Period, word length 16 bit is the cycle, and its meaning under Different Strategies is had nothing in common with each other;
Prefix/Address, word length is adjustable, for setting strategy lower required 0, one or more prefixes or address.
2. method according to claim 1, is characterized in that: the various different modes in the OptimizingOption territory in described six kinds of scenes are all that the respective code of employing 16 bit word length represents.
3. method according to claim 1, it is characterized in that: in described scene (5), represent that the describing method of the update probability value Period of session anchor node is: start until the rightmost side with position, the leftmost side in its word length 16 bit, be respectively the 1st after binary digit decimal point until after decimal point the 16th; Couple in router or mobile terminal according to network configuration or session need this Period numerical value is set, when mobile terminal moves to current Access Router place, this couple in router judges whether one of its stochastic generation probable value between 0 to 1 is not more than Period numerical value, if so, then this couple in router Session Anchor that mobile terminal is being continued in this locality; Otherwise this couple in router only carries out data retransmission operation, and the session of this terminal of not grappling.
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| CN102647708A (en) * | 2012-04-06 | 2012-08-22 | 中山大学 | Distributive mobile IPv6 method based on network mobile management and routing optimization |
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| KR20100011250A (en) * | 2008-07-24 | 2010-02-03 | 성균관대학교산학협력단 | Method of optimizing route for data packet transmission between mobile node and onlink node using routing table in mobile access gateway of pmipv6 environment |
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