CN103581019B - A kind of information centre's network mobility management method of content-based popularity - Google Patents
A kind of information centre's network mobility management method of content-based popularity Download PDFInfo
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Abstract
Information centre's network mobility management method of content-based popularity, belongs to Next Generation Internet technical research technical field. Requestor's side shifting, content requestor sends the request of Interest bag, and the router in network is received Interest message, first searches local cache, if local cache has this content directly to return to requestor, otherwise inquiry PIT table; Agent node compares according to the popularity of this content and popularity threshold k; Does content source move to reposition, to proxy? node sends " switching completes " message, and M home position is that " 2 " represent finishing switching, and K home position is " NULL ". The present invention has realized the mobility of content center Network Mobility node, based on the motion management method of agent node and two kinds of forms of network-caching, the communication disruption of having avoided single fault node and link failure to cause; Cannot continue service once agent node breaks down, network can be selected to carry out switching by the mode of network-caching automatically, ensures normally carrying out of communication.
Description
Technical field
The information centre's network mobility management method that the present invention relates to a kind of content-based popularity, belongs to Next Generation InternetTechnical research technical field.
Background technology
Next Generation Internet is studied just in like a raging fire, ardent carrying out. Current internet is faced with unprecedented skillThe challenge of art and non-technology, is difficult to meet the demand of the aspects such as contents distribution, mobility, security. From technological layer,Internet designed before 40 years, and design principle is simple, and the hourglass model of IP network is difficult to amendment, by continuous patch installing and foldedScreening method increases new function, and increment changes very difficult ever-increasing contents distribution, mobility, the reliability requirement supported.Lack intrinsic safety, often suffer day by day complicated network attack. From non-technical level, a large amount of flows of current internetThe info web and the multimedia retrieval service that generate from Static and dynamic, user's care obtains information instead of IP agreement is adoptedWith end-point addresses, therefore internet need to be converted to supported data, content and user from the bag distribution mode of host-to-hostDiversity mode.
Change current internet towards host design pattern, based on designing the Internet architecture centered by information, establish IP-basedMeter converts the design of content-based or Data dissemination to, can meet at present and Future Internet contents distribution, mobility, peaceThe demand of the aspects such as Quan Xing, at present relevant study and standardized process has been obtained greater advance. But frame for information aboutName autgmentability and the polymerization of structure, data and content caching management, the fermentation such as safety and privacy also need further research, spyNot to also have larger research space in conjunction with mobile Internet framework and algorithm research centered by mobile network's information.
Information centre's network is a kind of new network architecture, has changed the communication mode of original TCP/IP network end-to-end, passes throughContent name is carried out identification data, ask the node of this content without the position of knowing content in network, but broadcast is askedThe name of content can obtain from the intermediate router or the content source that are cached with this content. It is current mutual designing main starting pointNetworking pattern [1] (approximately 90% flow) is the Data dissemination from data source to user, and information centre's network is exactly in order to makeWith current internet use pattern design.
There is at present the research of a lot of research projects network centered by the information of carrying out, as European PSIRP, 4WARD, PURSUIT,The CCN of SAIL and the U.S., DONA, NDN. For rapping off, within 2011, IRTF sets up information centre's network research group [2].Centered by proposed content in the scheme of network, although their network structure difference has identical hypothesis,Target and some structure attribute, and interruption, interference and the sudden strain of a muscle that can adapt to preferably communication service such as gather around at the impact. In content beIn central site network, communication comes initial [3] by recipient's solicited message entity, and network can be by holding these data or numberMeet this request according to the source of copy, effectively caching function independently of simultaneously network support.
Although information centre's network content share aspect there is good advantage, be mobile for content source and requestorScene under this advantage just no longer obvious. Therefore the mobility mechanism problem of information centre's network also will divide under two kinds of scenesNot Tao Lun: the mobility scene in content-based source and the scene moving based on requestor.
The scene that the intrinsic support requestor of information centre's network moves, in the time that requestor carries out switching in communication process, netRouter in network does not know that requestor's position has changed, and therefore, the packet of passing back from content source is reversed to be routed to and asksThe person's of asking original position. In the time that requestor is switched to reposition, sends and do not have requested person to receive but still need to retransmit thesePacket, so just brought unnecessary network resource loss. Meanwhile, due to the renewal of routing table, be buffered in requestNear packet person's original position on node can not provide real time service nearby, and requestor may still need be from content far awaySource is request data again. In order to find the content of local cache, need to upgrade Routing Protocol, this just makes information centre's networkLayer naming routing variable obtains more complicated.
For the mobility of content source, content source all routers in need advertised network after switching upgrade routing table,To successfully receive following or ongoing request message, owing to upgrading the time that routing table need to be longer, request message alsoCan not promptly and accurately send to content source. Meanwhile, because requestor does not know network problem or node mobility causesPacket cannot return, brought unnecessary bandwidth and resource loss and resend request message. In addition, considerThe impact of route aggregation, according to the network topological information of position after switching, renames content the receipts that are conducive to routeHold back, but because the name of request content changes, requestor cannot obtain new content name, causes content source handoff procedureIn communication disruption be also need consider problem. So under the scene moving in content source, should consider content name moreThe new impact on routing convergence, considers to retransmit network overhead and the resource loss problem brought again, and this is just to information centre's netNetwork mobile management has brought baptism.
1. prior art one related to the present invention:
1.1 sending out fast due to mobile technology and multimedia technology (as message, web page browsing, video camera, media player)Exhibition, the Mobile data flow that user issues constantly increases, and from the viewpoint of quantity, quality and real-time, current network isCan not meet user's demand. Information centre's network is born as a kind of emerging network architecture, but does not consider for establishingStandby ambulant problem.
Document [4] proposes to adopt a kind of part Path extension mechanism to meet the mobility of content source in content center network. When interiorHold source node and carry out while switching, source node is to router advertisement ' Prefixregistration ' message of original position, networkIn the local prefix of router contrast oneself of all approach compare, if unanimously identify the corresponding interface of this message arrivalFor ' valid ', will be designated as ' tentative ' with the Interface status objective of this prefix matching simultaneously; Otherwise according to FIB(ForwardingInformationBase) ' Prefixregistration ' message is mail to next hop router by table.The router of original position is received after this message, sends ' Pregconfirmation ' message and oppositely passes to content source, like thisBetween the original position of content source and reposition, set up a paths, all packets that mail to original position all pass through this pathBe transmitted to reposition. If the previous dive topology location of content source is not original position, original position router needs to send' Prefixrevocation ' message to the previous dive router of content source with remove and original position router between path, on the wayAlso new routing information more of the internetwork router in footpath, is labeled as ' stale ' by corresponding port entries. This mode isThe mobile management of content center network provides serves access delay and network is only born lower routing cost faster.
The shortcoming of 1.2 prior aries one:
Although prior art one has proposed a kind of scheme that solves content source mobile context in content center network, only formerBetween beginning territory router and mobile domains router, set up an extensions path, do not consider route extensibility, route break andLink failure problem. Once the arbitrary router on original domain router failure or path breaks down, cannot set up originalTerritory, to the connection between mobile domains, causes packet loss, communication disruption.
2. prior art two related to the present invention:
2.1 documents [5] propose to adopt the mode of interim prefix encapsulation in content source handoff procedure. In content center network,Suppose the prefix information of each router broadcast oneself, each content source has a local router node that the whole network is unique, inRong Yuan judges the position of oneself by monitoring constantly the prefix information of institute's couple in router notice, if prefix information is inconsistent, sayThe position of bright content source is moved.
After content source detects and switches, generate one according to the prefix of the content name prefix of holding and couple in router noticeIndividual interim prefix, and interim prefix is carried to the local route that mails to content source in " Prefixupdate(PU) " messageDevice, the all-router of approach is by checking the local prefix of carrying in message packet header, and compares with the prefix of oneself,If consistent judge that this router is the local router of content source, otherwise mail to next-hop node according to the entry of fib table.Local router is received to extract interim prefix after PU message and send " PUacknowledgment(PACK) " message and is oppositely passedGive content source, so just between the territory, local of content source and mobile domains, formed the communication of a tunnel execution handoff procedure.In handoff procedure, the packet in all request contents source all can mail to the local router of content source, and local router will be askedInformation (Interest) encapsulates, and in the temporary address in data packet head encapsulated content source, mails to through intermediate routerContent source, the original prefix that now decapsulation of request bag is obtained request message by intermediate router is to set up PIT(PendingInterestTable) table. Content source receives that request message wraps reverse road by the data corresponding with request content name at DataBy giving local router, same Data also wants the interim prefix in encapsulated content source in packet header, and Data is wrapped deblocking by intermediate routerDress, obtains data content corresponding to original prefix, is stored in local cache, and Data bag arrives local router and carries out deblockingDress, then according to PIT table, content-data is routed to each requestor.
The shortcoming of 2.2 prior aries two
Prior art two has proposed a kind of content center network mobility Managed Solution based on tunnel, in the territory, local of content sourceAnd between mobile domains, set up a tunnel, all packets that mail to content source or send from content source all will be via territory, local routeDevice encapsulation and decapsulation. Although this mechanism has reduced the expense of routing update, with prior art one, still existThe possibility of router failure and link failure, all data flow of handoff procedure in local router administration, have formed single eventBarrier node, once router lost efficacy, network service is interrupted, and irrecoverable. In addition, to Interest and DataThe encapsulation of bag is difficult for realizing, and does not also consider overhead and delay problem that encapsulation brings in literary composition.
3. prior art three related to the present invention
3.1 bibliography [6] propose a kind of request bag pass-through mode. In the time that content source is about to carry out switching, upper hop accessRouter sends and switches advertised information, and now couple in router receives all Interest bag buffer memorys that mail to content source, whenContent source is switched under new couple in router, sends a virtual request " virtualinterest " message, this messageCarry the name information of content source, network can be forwarded to primary access router according to the longest prefix match principle of fib table,The all-router of approach upgrades the interface message corresponding with content name in fib table. Primary access router is received " virtualInterest " after message, the Interest message of buffer memory is oppositely passed to content source, follow-up Interest bag can rootAccording to directly forwarding, fib table needn't forward through primary access router.
The shortcoming of 3.2 prior aries three
Prior art three is by " virtualinterest " message, by the route between the original position of content source and repositionDevice fib table upgrades, in the caching function of primary access router is oppositely passed to the Interest bag in handoff procedure simultaneouslyRong Yuan, follow-up Interest message is carried out route according to the fib table after upgrading. Although this scheme has reduced path moreNew expense and handover delay, but owing to remaining in content source handoff procedure that content name is constant, after not considering to switchRoute aggregation convergence problem, can cause fib table entry excessive, bring burden to server.
Partial reference document:
[1]V.Jacobson,D.K.Smetters,J.D.Thornton,M.F.Plass,N.H.Briggs,andR.L.Braynard.Networkingnamedcontent.InProceedingsofthe5thinternationalconferenceonEmergingnetworkingexperimentsandtechnologies,ser.CoNEXT'09.NewYork,NY,USA:ACM,2009.
[2]Information-CentricNetworkingResearchGroup(ICNRG).
http://trac.tools.ietf.org/group/irtf/trac/wiki/icnrg,2012.01.20.
[3]ZhangL,EstrinD,BurkeJ,etal.Nameddatanetworking(ndn)project[J].RelatórioTécnicoNDN-0001,XeroxPaloAltoResearchCenter-PARC,2010.
[4]J.LeeandD.Kim,“MobilityManagementforMobileConsumerDevicesinContentCentricNetworking(CCN),”IEEEInt’l.Conf.ConsumerElectronics(ICCE),Jan.2012.
[5]J.Lee,S.ChoandD.Kim,“DeviceMobilityManagementinContent-CentricNetworking,”IEEECommunicationsMagazine,Dec.2012.
[6]D.Kim,J.Kim,Y.Kim,H.Yoon,andI.Yeom,“MobilitySupportinContentCentricNetworks,”InProc.SIGCOMMWorkshoponICN,2012.
Summary of the invention
The object of the invention is to propose a kind of in information centre's network the motion management method of content-based popularity, pass throughThe suitable mobility scheme of alternative of content popularit threshold value.
The present invention is based on content center network, proposed the motion management method of content-based popularity under a kind of this network.The present invention relates to two kinds of mobility scenes, i.e. requestor's side shifting and content source side shifting. Under requestor's side shifting scene, inHold requestor and send a content of Interest bag request, the router in network is received Interest message, first searchesLocal cache, if local cache has this content directly to return to requestor, otherwise inquiry PIT table, if in PIT table, have withThe option that this content name is corresponding, illustrates that this content does not expire in requested mistake and life span, now by InterestAbandon, search fib table according to longest prefix match principle continuation forwarding if do not set up PIT option simultaneously. Work as requestorIn the time of request data, switch, only need after switching is carried out, resend and not receive that the Interest bag of Data data continuesRequest, content center network is supported requestor's mobility inherently. The mobile context of content source is according to content popularit differenceBe divided into two kinds of situations: the motion management method based on agent node and the motion management method of buffer memory Network Based. Based onThe motion management method of agent node is to be in charge of and to switch by dispose agent node " proxynode " in networkInformation interaction, Interest buffer memory in journey also carries out the replacement between the new and old name of content source.
Before content source is carried out switching, source node sends " switch and notice " message to agent node, and M home position is " 0 "Represent handover request message, K home position is " NULL ".
The content of request is obeyed Zipf and is distributed, and the content that popularity is high requested number of times in network is more, network nodeThe probability of this content of buffer memory is larger, and content is easy to obtain from adjacent node; The requested number of times of content that same popularity is low is got overLow, the probability of network node buffer memory is less, and the content of request is not easy to obtain from adjacent node.
Agent node is received the popularity threshold value of the content name of carrying in computation request message after this message
J represents asked content, and k represents the number of times of request content j, and α represents distribution of contentDense degree, α is larger, distribute more intensive, α ∈ (0,1), according to the content distributed quantity of internet site and access ratio,We are α=0.9 herein conventionally. Content popularitObeying Zipf distributes.
Agent node compares according to the popularity of this content and popularity threshold k, is less than K by the side of agent nodeFormula is carried out handoff procedure, is greater than K and obtains Data message by the mode of network-caching. Which kind of agent node judgement carried out and cutChange after mode, send " switch and confirm " message to requestor, M home position is that " 1 " expression switching is confirmed, K flagBe set to " 0 " and represent the mode based on agent node, K home position is the mode that " 1 " represents buffer memory Network Based.
Content source moves to reposition, sends " switching completes " message to proxynode, and M home position is that " 2 " representFinishing switching, K home position is " NULL ".
Described content popularit ρ (j) calculates according to the request bag of the Interest receiving of every node statistics in network, every node is shown the Interest message with different prefixes receiving according to local PIT, the different prefixes of computation requestsThe percentage of Interest bag, so content popularit is a percentage (< 1).
The present invention proposes the mobility management scheme of the content-based popularity of a kind of content center network, according to content popularit thresholdValue is selected suitable mobility scene. Design network agent node, be in charge of in the handoff procedure based on agent nodeAll data flow, the request data package in buffer memory handoff procedure. Design name prefix replacement policy, in handoff procedure, enteredThe new and old name of row content is replaced, and makes handoff procedure transparent to requestor. Three kinds of hand off signaling are designed: " switch and notice " disappearsBreath, " switch and confirm " message, " switching completes " message.
Beneficial effect of the present invention:
The present invention, in content center network, adopts the mobility management scheme of content-based popularity, has realized content centerThe mobility of Network Mobility node. For based on agent node and two kinds of modes of network-caching, mobile node can be according to content flowWhich kind of mobility scheme row degree selects to carry out. The popularity of content is higher, and in network, this content node number of buffer memory is more,After carrying out switching, can obtain data from node nearby. The popularity of contrary content is lower, this content of buffer memory in networkInterstitial content less, consider routing convergence characteristic, carry out mobile management by the mode of agent node and be more suitable for spyFixed network topology.
This selectable mobility management scheme can reduce network handover delay, reduces signalling expense in handoff procedure,Agent node is replaced the new and old name of content source simultaneously, is completely transparent for requestor, has ensured switchingTransparent transmission.
Adopt the motion management method based on agent node and two kinds of forms of network-caching, can effectively avoid single fault jointPoint and link failure cause the possibility of communication disruption. Cannot continue service once agent node breaks down, network can be certainlyMoving selection carried out switching by the mode of network-caching, ensures normally carrying out of communication.
Brief description of the drawings
Fig. 1 is that the content center network request person who the present invention is based on popularity moves schematic diagram.
Fig. 2 is that schematic diagram is moved in the content center Web content source that the present invention is based on popularity.
Fig. 3 is flow chart of the present invention.
Detailed description of the invention
Further illustrate the present invention below in conjunction with drawings and Examples.
Information centre's network mobility management method of content-based popularity,
The present invention mainly solves following problem:
In network, dispose agent node, be responsible for the pre-switch signaling of reception & disposal content source, in buffer memory handoff procedureInterest message is responsible for the reposition name of content source and the replacement of original position name simultaneously.
Definition popularity threshold value, according to the popularity computation threshold k of request content, determines to adopt based on agent node or network slowThe mode of depositing solves the mobility problem of content source.
Definition " is switched and is noticed ", " switch and confirm ", " switching completes " three hand off signaling.
Technical scheme provided by the invention is,
(1) requestor's side shifting
The content center network mobility Managed Solution topology based on popularity that the present invention realizes is as Fig. 1, shown in Fig. 2.
Fig. 1 is the content center network request person mobile context schematic diagram that the present invention is based on popularity.
For the mobility of requestor's side as shown in Figure 1, requester requests content name is "/ccn/CR1/ccnfile.doc "File. In communication implementation, content requestor is switched to content router n from accessing content router one, only need switchAfter completing, resend the Interest request bag of not receiving that Data bag is replied. Because content center network is based on interiorAppearance name is carried out request data, is different from the IP address of TCP/IP network, requestor's movement and the position of request content letterBreath is irrelevant.
(2) content source moves
For the mobility of content source as shown in Figure 2, Fig. 2 is that the content center Web content source that the present invention is based on popularity is movedMoving scene. Content source is carried content name for the file of "/ccn/CR1/ccnfile.doc/ " is from accessing content router one(ContentRouter1, CR1) is switched to content router n(ContentRoutern, CRn).
The method that content source based on popularity moves, the method step is:
Step 1: requestor sends to network the Interest request that name prefix is "/ccn/CR1/ccnfile.doc " and disappearsBreath message.
Step 2: content source is received request bag, will send to by Data message with the content of solicited message name prefix matchingRequestor.
Step 3: content source is carried out mobility switching in advance, sends and " cuts to the agent node (proxynode) of content LoginChange notice " message, the reset of M flag, K home position " NULL ", carries the content name that content source is held in messageWord "/ccn/CR1/ccnfile.doc ".
Step 4: agent node is received after " switch and notice " message, calculates content popularit threshold k according to content name, willThe popularity ρ (j) of content name and K compare, if ρ (j) < K adopts the motion management method based on agent node,If ρ (j) > K adopts the motion management method of buffer memory Network Based.
Step 5: agent node sends " switch and confirm ", and message is to content source, and M home position is " 1 ", carries in messageHave K flag, K=0 represents the mode based on agent node; K=1 represents the mode of buffer memory Network Based. If K=0, generationReason node mails to name prefix for the request message of "/ccn/CR1/ccnfile.doc " slow from now starting to receive networkExist in local cache. If K=1, agent node does not carry out any operation, now requestor by re-transmission request message from vicinityNetwork-caching in obtain request content
Step 6: content source checks which kind of switchover policy is K flag carry out with judgement after receiving " switch and confirm " message, withTime be switched to content router n from content router 1. Consider routing convergence, content source is being switched to after content router n,According to the variation of network topology, corresponding content name prefix updates is "/ccn/CRn/ccnfile.doc ". If K=0,Carrying to agent node transmission " switching completes " message that name prefix is "/ccn/CRn/ccnfile.doc " shows to cutChange, M home position " 2 ", K home position " NULL " informs the name prefix that agent node has upgraded simultaneously.
Step 7: agent node receives that " switching completes " message searches the name prefix of renewal, by buffer memory in handoff procedureThe name prefix updates of Interest request message sends to content source for "/ccn/CRn/ccnfile.doc ", and content source is receivedTo request message, forward rule according to content center network Data and forward.
Step 8: agent node is received the Data bag that name prefix is "/ccn/CRn/ccnfile.doc ", again by nameReplace with "/ccn/CR1/ccnfile.doc " and be transmitted to requestor.
(3) signaling format
According to mobility management scheme of the present invention, define the corresponding signaling of handoff procedure, be defined as follows:
1) switch notice message
Index value: identification message sequence number, unique index value mark for a pair of Interest-Data message.
Scope: the position of having limited Interest diffusion.
Scope=0 is limited in this locality and searches
Spread to content source scope=1
Scope=2 diffusion one is jumped
Retain position: use as expansion
The life span of Interest life span: Interest bag abandons same name within life spanInterest message, the overtime Interest that resends of life span asks.
Length: represent the bit length of field below.
M flag: be used for representing hand off signaling. M=0 represents " switch and notice " message.
K flag: represent to switch implementation strategy. In this message, be set to " NULL ".
Name: new (old) name of content source.
2) switch acknowledgment message
Index value: identification message sequence number, unique index value mark for a pair of Interest-Data message.
Scope: the position of having limited Interest diffusion.
Scope=0 is limited in this locality and searches
Spread to content source scope=1
Scope=2 diffusion one is jumped
Retain position: use as expansion
The life span of Interest life span: Interest bag abandons same name within life spanInterest message, the overtime Interest that resends of life span asks.
Length: represent the bit length of field below.
M flag: be used for representing hand off signaling. M=1 represents " switch and confirm " message.
K flag: represent to switch implementation strategy. K=0 represents to adopt the motion management method based on agent node; K=1 tableShow the motion management method of Adoption Network cache way.
Name: new (old) name of content source.
3) handoff completion message
Index value: identification message sequence number, unique index value mark for a pair of Interest-Data message.
Scope: the position of having limited Interest diffusion.
Scope=0 is limited in this locality and searches
Spread to content source scope=1
Scope=2 diffusion one is jumped
Retain position: use as expansion
The life span of Interest life span: Interest bag abandons same name within life spanInterest message, the overtime Interest that resends of life span asks.
Length: represent the bit length of field below.
M flag: be used for representing hand off signaling. M=2 represents " switching completes " message.
K flag: represent to switch implementation strategy. In this message, be set to " Null ".
Name: new (old) name of content source.
Content center network mobility Managed Solution of the present invention relates to two kinds of scenes: the mobility based on requestor and content-basedThe mobility in source. For requestor's mobility, requestor need resend and not receive reply after switchingInterest request message. For content source, because content center network is to obtain data by request content name, for the ease of routing convergence, content source is after switching, and content name will be upgraded according to network topology, soUnder mobility management scheme based on agent node, agent node is responsible for receiving all packets that mail to content source while switching,Treat, after content source is switched, the Interest bag of buffer memory is issued to content source, be responsible for replacing between requestor and content source simultaneouslyChange the content name of packet, realize transparent switching for requestor.
The present invention adopts selectable mobility management scheme, selects based on agent node or network slow according to the popularity of contentThe mode of depositing solves the switching problem of content source. Because switching can bring the variation of network topology and the position of node switching alsoBe random, for the low content of popularity, we dispose an agent node in network, have agent node management to switchRequest message in process, is responsible for being transmitted to the reposition of content source after switching, and the name of content is replaced; ForThe content that popularity is high, in network, the nodes of this content of buffer memory is more, after switching, can obtain data from adjacent nodeAnd without through agent node, reduced the unnecessary expense that all will produce via agent node due to all data.
The present invention proposes the mobility management scheme of the content-based popularity of a kind of content center network, according to content popularit thresholdValue is selected suitable mobility scene. Design network agent node, be in charge of in the handoff procedure based on agent nodeAll data flow, the request data package in buffer memory handoff procedure. Design name prefix replacement policy, in handoff procedure, enteredThe new and old name of row content is replaced, and makes handoff procedure transparent to requestor. Three kinds of hand off signaling are designed: " switch and notice " disappearsBreath, " switch and confirm " message, " switching completes " message. The present invention adopts content-based popularity in content center networkMobility management scheme, realized the mobility of content center Network Mobility node. For slow based on agent node and networkDeposit two kinds of modes, which kind of mobility scheme mobile node can select to carry out according to content popularit. The popularity of content is higher,In network, this content node number of buffer memory is more, after carrying out switching, can obtain data from node nearby. Like this canTo reduce network handover delay, reduce signalling expense in handoff procedure, agent node is by the new and old name of content source simultaneouslyReplacing, is completely transparent for requestor, has ensured the transparent transmission of switching. Adopt based on agent node andThe motion management method of two kinds of forms of network-caching, can effectively avoid during single fault node and link failure cause communicating by letterDisconnected possibility. Cannot continue service once agent node breaks down, network can be selected the side by network-caching automaticallyFormula is carried out and is switched, and ensures normally carrying out of communication.
Claims (4)
1. information centre's network mobility management method of content-based popularity, is characterized in that, the method step asUnder:
(1) requestor's side shifting
Content requestor sends content of Interest message request, and the router in network is received Interest message,First search local cache, if local cache has this content directly to return to requestor, otherwise inquiry PIT table, if PITIn table, there is the option corresponding with this content name, illustrate that this content does not expire in requested mistake and life span, now willInterest message abandons, if do not have, sets up PIT option and searches fib table simultaneously and continue according to longest prefix match principleForward; When requestor switches during in request data, only need not receive Data data switching resend after carrying outInterest message continues request, and content center network is supported requestor's mobility inherently;
(2) content source side shifting
The mobile context of content source is divided into two kinds of situations according to content popularit difference: based on the mobile management side of agent nodeThe motion management method of method and buffer memory Network Based;
Motion management method based on agent node is to be responsible for pipe by dispose agent node " proxynode " in networkInformation interaction, Interest message buffering in reason handoff procedure also carries out the replacement between the new and old name of content source;
Before content source is carried out switching, source node sends " switch and notice " message to agent node, and M home position is " 0 "Represent handover request message, K home position is " NULL ";
The content of request is obeyed Zipf and is distributed, and the content that popularity is high requested number of times in network is more, network nodeThe probability of this content of buffer memory is larger, and content is easy to obtain from adjacent node; The requested number of times of content that same popularity is low is got overLow, the probability of network node buffer memory is less, and the content of request is not easy to obtain from adjacent node;
Agent node is received the popularity threshold value of the content name of carrying in computation request message after this messageJ represents asked content, and k represents the number of times of request content j, and what α was distribution of content is intensiveDegree, α ∈ (0,1); Content popularitObeying Zipf distributes;
Agent node compares according to the popularity of this content and popularity threshold k, is less than K by the side of agent nodeFormula is carried out handoff procedure, is greater than K and obtains Data message by the mode of network-caching; Which kind of agent node judgement carried out and cutChange after mode, send " switch and confirm " message to requestor, M home position is that " 1 " expression switching is confirmed, K flagBe set to " 0 " and represent the mode based on agent node, K home position is the mode that " 1 " represents buffer memory Network Based;
Content source moves to reposition, sends " switching completes " message to proxynode, and M home position is that " 2 " representFinishing switching, K home position is " NULL ".
2. information centre's network mobility management method of a kind of content-based popularity according to claim 1, its spyLevy and be, described α=0.9.
3. information centre's network mobility management method of a kind of content-based popularity according to claim 1, its spyLevy and be, described content popularit ρ (j) is according to the request bag of the Interest message receiving of every node statistics in networkCalculate, every node is shown the Interest message with different prefixes receiving, computation requests difference according to local PITThe percentage of the Interest message of prefix, content popularit is a percentage and is less than 1.
4. information centre's network mobility management method of a kind of content-based popularity according to claim 1, its spyLevy and be, the signaling format of described handoff procedure is:
1) switch notice message
Index value: identification message sequence number, unique index value mark for a pair of Interest-Data message;
Scope: the position of having limited Interest message dissemination;
Scope=0 is limited in this locality and searches
Spread to content source scope=1
Scope=2 diffusion one is jumped
Retain position: use as expansion
Interest message life span: the life span of Interest message abandons same name within life spanInterest message, the overtime Interest message request that resends of life span;
Length: represent the bit length of field below;
M flag: be used for representing hand off signaling; M=0 represents " switch and notice " message;
K flag: represent to switch implementation strategy; In this message, be set to " NULL ";
Name: the new or old name of content source;
2) switch acknowledgment message
Index value: identification message sequence number, unique index value mark for a pair of Interest-Data message;
Scope: the position of having limited Interest message dissemination;
Scope=0 is limited in this locality and searches
Spread to content source scope=1
Scope=2 diffusion one is jumped
Retain position: use as expansion
Interest message life span: the life span of Interest message abandons same name within life spanInterest message, the overtime Interest message request that resends of life span;
Length: represent the bit length of field below;
M flag: be used for representing hand off signaling; M=1 represents " switch and confirm " message;
K flag: represent to switch implementation strategy; K=0 represents to adopt the motion management method based on agent node; K=1 tableShow the motion management method of Adoption Network cache way;
Name: the new or old name of content source;
3) handoff completion message
Index value: identification message sequence number, unique index value mark for a pair of Interest-Data message;
Scope: the position of having limited Interest message dissemination;
Scope=0 is limited in this locality and searches
Spread to content source scope=1
Scope=2 diffusion one is jumped
Retain position: use as expansion
Interest message life span: the life span of Interest message abandons same name within life spanInterest message, the overtime Interest message request that resends of life span;
Length: represent the bit length of field below;
M flag: be used for representing hand off signaling; M=2 represents " switching completes " message;
K flag: represent to switch implementation strategy; In this message, be set to " Null ";
Name: the new or old name of content source.
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| CN201310471355.4A CN103581019B (en) | 2013-10-10 | 2013-10-10 | A kind of information centre's network mobility management method of content-based popularity |
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| CN201310471355.4A CN103581019B (en) | 2013-10-10 | 2013-10-10 | A kind of information centre's network mobility management method of content-based popularity |
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| CN103581019B true CN103581019B (en) | 2016-05-18 |
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Families Citing this family (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104158842B (en) * | 2014-07-14 | 2017-05-31 | 中国人民解放军信息工程大学 | A kind of dynamic data power supply management method based on many agencies |
| CN104468515B (en) * | 2014-10-31 | 2017-10-24 | 许继集团有限公司 | A kind of intelligent transformer substation communication method and system based on information centre's network |
| CN105188088B (en) * | 2015-07-17 | 2019-07-12 | 中国科学院信息工程研究所 | Caching method and device based on content popularit and node replacement rate |
| CN105025111B (en) * | 2015-08-10 | 2018-11-09 | 广州大学 | Data Source Apportionment in a kind of information centre's network ICN |
| CN105357246B (en) * | 2015-08-12 | 2018-08-24 | 北京交通大学 | Caching method based on information centre's network and system |
| WO2018007349A1 (en) * | 2016-07-05 | 2018-01-11 | Koninklijke Kpn N.V. | Systems and methods for transmitting and receiving interest messages |
| CN107733948B (en) * | 2016-08-11 | 2021-01-05 | 中国电子科技集团公司电子科学研究院 | User mobility support method for distinguishing content in CCN (content-centric networking) |
| CN106790421B (en) * | 2016-12-01 | 2020-11-24 | 广东技术师范大学 | ICN two-step caching method based on community |
| EP3556083B1 (en) * | 2016-12-14 | 2021-10-06 | IDAC Holdings, Inc. | System and method to register fqdn-based ip service endpoints at network attachment points |
| CN106603297B (en) * | 2016-12-22 | 2019-05-31 | 北京邮电大学 | Content provider's mobile switch method of content center network |
| CN106936833B (en) * | 2017-03-15 | 2020-08-11 | 广东工业大学 | Content center network privacy protection method based on mixed encryption and anonymous group |
| CN107317754B (en) * | 2017-05-12 | 2019-12-31 | 北京大学深圳研究生院 | NDN mapping table updating method and device, NDN interest packet forwarding method and device and NDN |
| CN107135271B (en) * | 2017-06-12 | 2020-05-19 | 浙江万里学院 | Energy-efficient content-centric network caching method |
| CN107908357B (en) * | 2017-10-13 | 2020-08-21 | 天津大学 | Named data network forwarding plane PIT storage structure and data retrieval method thereof |
| CN108600107B (en) * | 2017-11-07 | 2021-06-01 | 北京交通大学 | Flow matching method capable of customizing content field |
| US10595222B2 (en) * | 2018-03-07 | 2020-03-17 | Futurewei Technologies, Inc. | Enabling cross-layer receiver oriented dynamic multicast in cellular access |
| CN108777874A (en) * | 2018-05-31 | 2018-11-09 | 安徽电信器材贸易工业有限责任公司 | A kind of method and its system that router mutually switches |
| CN111404972B (en) * | 2019-01-02 | 2023-04-07 | 中国移动通信有限公司研究院 | Data processing method, device, equipment and storage medium |
| CN110099005B (en) * | 2019-05-20 | 2021-05-28 | 哈尔滨英赛克信息技术有限公司 | Information center network route optimization method based on redirection |
| CN112134803B (en) * | 2020-09-25 | 2022-03-25 | 中国人民解放军陆军装甲兵学院 | Named data network system and data transmission method and device thereof |
| CN112351075B (en) * | 2020-10-21 | 2022-08-12 | 重庆邮电大学 | Combined mobile management method and system based on content-centric networking |
| CN112261128B (en) * | 2020-10-21 | 2022-08-12 | 重庆邮电大学 | Active push caching method for content source movement in CCN |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2562978A1 (en) * | 2011-08-12 | 2013-02-27 | Alcatel Lucent | Content router of a content centric network |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8694675B2 (en) * | 2011-09-01 | 2014-04-08 | Futurewei Technologies, Inc. | Generalized dual-mode data forwarding plane for information-centric network |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| EP2562978A1 (en) * | 2011-08-12 | 2013-02-27 | Alcatel Lucent | Content router of a content centric network |
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