CN103916253A - Information transmission method and system on basis of information center network - Google Patents
Information transmission method and system on basis of information center network Download PDFInfo
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Abstract
The invention discloses an information transmission method on the basis of the information center network. The method comprises the steps of information transmission mode establishment, multi-path transmission and multicast transmission. The step of information transmission mode establishment is used for establishing a one-to-many information transmission mode, wherein the one-to-many information transmission mode maintains a total transmission task of information, distributes the total transmission task of the information to a plurality of subsidiary transmission streams through a main transmission stream, and achieves one-to-many information transmission; the multi-path transmission step is used for sending and receiving the information by adopting a multi-path transmission strategy on the basis of the one-to-many information transmission mode; the multicast transmission step is used for distributing information content by adopting a multicast strategy on the basis of the one-to-many information transmission mode. The invention further discloses an information transmission system on the basis of the information center network.
Description
Technical field
Technical field of the present invention is computer network, particularly a kind of information transferring method and system thereof based on information centre's network.
Background technology
Along with the development of applying on the Internet changes, the existing the Internet based on TCP/IP also exposes many being not suitable with gradually.Current, the problem mainly exposing on the Internet has: dangerous, poor mobility, poor reliability, very flexible.In order to address these problems, Present Domestic mainly contains " improvement " and " revolution " two kinds of thinkings outward.Say simply, all principal status of public economys that does not change internet ip, belong to " improvement "; And want the network of the principal status of public economy that substitutes IP just to cry " revolution ".At present have in the world a lot of research institutions to carry out the design studies of following network, ICN is one of current main research direction.
Information centre's network (Information-Centric Networking, ICN) is the novel internet architecture model of a class.The main thought of ICN derives from the observation of the change to applying on current the Internet.Current the Internet is at the beginning of origin, and main application demand is computing resource sharing, and through the development of more than 50 years, huge variation occurred in the use of the Internet, and the main user demand of the Internet is now obtaining of content and distributes.Although there is so large variation in application, but the architecture of the Internet remains Host-to-Host communication pattern, for the Internet as leading take issue and obtaining information, Host-to-Host communication pattern exists significantly not enough, such as each access content, all to indirectly be mapped to the equipment at content place.In order to address this problem, ICN will adopt the content of certain rule name as the eel-like figure of its architecture.Each content is endowed a unique name, does not need the position at prior query contents place when user obtains content, but directly expresses by the name of this content.The sharpest edges of ICN can be carried out buffer memory for content exactly, thereby greatly increase the efficiency of communication; Meanwhile, carry out safety certification for content itself, safer than legacy network.At present mainly contain DONA, CCN/NDN, PSIRP/PURSUIT, SOFIA, NetInf etc. about the main architecture model of information centre's network.
ICN is a kind of abstract system model, for convenient narration, briefly introduces the implementation of a kind of ICN, Service-oriented ICN(SOFIA at this) architectural model.
SOFIA is a kind of service-oriented architectural framework, using the name of service as the eel-like figure part of architecture, make application program without knowing the position of service direct access services itself.Service can be net cast, the networking telephone, webpage etc.Router in SOFIA has service processing ability, such as content, the poly-and identical service request etc. of buffer memory service transmission.
Fig. 1 is the system model schematic diagram of SOFIA, as shown in Figure 1, transport layer (Transport Layer) is responsible for congestion control, service layer (Service Layer) is responsible for service establishment of connection, maintenance and management, network layer (Network Layer) is responsible for package forward end to end, also comprises: application layer (Application Layer) and link layer (Comm Medias).SOFIA adopts hybrid route: the route based on service and the route based on address.When request service, transmit according to Service name inquiry service, when transfer of data according to network address inquiry data retransmission table.
Fig. 2 is that SOFIA service forwards and transfer of data schematic diagram, as shown in Figure 2 in SOFIA, and the process of service request and transfer of data.First Service Instance Inst1(Service Instance of client a generation is the instantiation of service connecting needle to different content), then send request the service request of serving X.Service request when through intermediate router R1, R2, R3 all inquiry service transmit SFIB, finally arrive server c.C receives after service request, newly-built Service Instance XInst1, and complete the mapping of XInst1 to remote service example.Next the packet that, c replys can be transmitted (according to address route) by data query when through intermediate router.A, after the reply of receiving c, can complete the mapping of local service example Inst1 to remote service instance X Inst1.So far connect completely and set up, follow-up transfer of data is all transmitted data query.
In ICN, in the time carrying out the communication of one-to-many, in network, tend to produce some and repeat the packet copying.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of multipath and multicast information transmission method based on information centre's network, repeats copy to overcome the packet existing in prior art, and occupied bandwidth, causes the problem of bandwidth waste and high time delay.
For reaching above-mentioned purpose, the invention provides a kind of information transferring method based on information centre's network, it is characterized in that, described method comprises:
Message transmission mode establishment step: for setting up one-to-many message transmission mode, described one-to-many message transmission mode is by the total transmission task of a total transport stream maintenance information, and by described total transport stream, the described total transmission task of information is distributed to multiple sub-transport stream, to realize the communication of one-to-many;
Multi-path transmission step: for based on described one-to-many message transmission mode, adopt multi-path transmission strategy to carry out the sending and receiving of information.
The above-mentioned information transferring method based on information centre's network, is characterized in that, described message transmission mode establishment step also comprises:
Total transport stream step: for the overall status of maintenance information transmission, and based on different distribution policies, described total transport stream is distributed to described multiple sub-transport stream;
Sub-transport stream step: for carrying out communication by described sub-transport stream and remote host.
The above-mentioned information transferring method based on information centre's network, is characterized in that, described multi-path transmission strategy is in message transmitting procedure, selects described sub-transport stream to carry out transfer of data by described total transport stream at request of data end according to different scheduling strategies.
The above-mentioned information transferring method based on information centre's network, is characterized in that, described multi-path transmission step comprises:
Send request step: sending when data, described total transport stream is updated to data content requests in described multiple sub-transport stream according to scheduling strategy, and after the parameter of carrying out described sub-transport stream arranges, send described data content requests by described sub-transport stream;
Reception information step: receive subdata content from described sub-transport stream, and the described subdata content receiving is integrated, form complete data content and offer upper level applications use.
The present invention also provides a kind of information transmission system based on information centre's network, adopts the described information transferring method based on information centre's network, it is characterized in that, described system comprises:
Message transmission mode is set up module: for setting up one-to-many message transmission mode, described one-to-many message transmission mode is by the total transmission task of a total transport stream maintenance information, and by described total transport stream, the described total transmission task of information is distributed to multiple sub-transport stream, to realize the communication of one-to-many;
Multi-path transmission module: for based on described one-to-many message transmission mode, adopt multi-path transmission strategy to carry out the sending and receiving of information.
The above-mentioned information transmission system based on information centre's network, is characterized in that, described message transmission mode is set up module and also comprised:
Total transport stream module: for the overall status of maintenance information transmission, and based on different distribution policies, described total transport stream is distributed to described multiple sub-transport stream;
Sub-transport stream module: for carrying out communication by described sub-transport stream and remote host.
The present invention also provides a kind of information transferring method based on information centre's network, it is characterized in that, described method comprises:
Message transmission mode establishment step: for setting up one-to-many message transmission mode, described one-to-many message transmission mode is by the total transmission task of a total transport stream maintenance information, and by described total transport stream, the described total transmission task of information is distributed to multiple sub-transport stream, to realize the communication of one-to-many;
Multicast transmission step: for based on described one-to-many message transmission mode, adopt multicast transmission strategy to carry out information content distribution.
The above-mentioned information transferring method based on information centre's network, is characterized in that, described message transmission mode establishment step also comprises:
Total transport stream step: for the overall status of maintenance information transmission, and based on different distribution policies, described total transport stream is distributed to described multiple sub-transport stream;
Sub-transport stream step: for carrying out communication by described sub-transport stream and remote host.
The above-mentioned information transferring method based on information centre's network, it is characterized in that, described multicast transmission strategy is that content supplier sends request of data by described total transport stream to relay router, provides content at described relay router by described multiple sub-transport stream to multiple request of data ends simultaneously.
The above-mentioned information transferring method based on information centre's network, is characterized in that, described multicast transmission step also comprises:
Router receives request step: router receives after the request of data X of client, the action queries of asking X in router solicitation table;
Set up total transport stream step: when described router described admission receive in request step, search matched data request X be operating as relaying RELAY, set up the described total transport stream between client and server;
Request polymerization procedure: when described router continues to receive after the described request of data X of other clients, the polymerization of asking, sends a described request of data X by up described total transport stream to server;
Data dissemination step: by the descending data content client that is distributed to each and sends described request of data X by multiple sub-transport stream.
The present invention also provides a kind of information transmission system based on information centre's network, adopts the described information transferring method based on information centre's network, it is characterized in that, described system comprises:
Message transmission mode is set up module: for setting up one-to-many message transmission mode, described one-to-many message transmission mode is by the total transmission task of a total transport stream maintenance information, and by described total transport stream, the described total transmission task of information is distributed to multiple sub-transport stream, to realize the communication of one-to-many;
Multicast transmission module: for based on described one-to-many message transmission mode, adopt multicast transmission strategy to carry out information content distribution.
The above-mentioned information transmission system based on information centre's network, is characterized in that, described message transmission mode is set up module and also comprised:
Total transport stream module: for the overall status of maintenance information transmission, and based on different distribution policies, described total transport stream is distributed to described multiple sub-transport stream;
Sub-transport stream module: for carrying out communication by described sub-transport stream and remote host.
Compared with prior art, beneficial effect of the present invention is, the packet causing can reduce one-to-many transmission in network time repeats copy, for some network service such as net cast etc. can effectively improve the utilance of bandwidth.Meanwhile, client can flexible customization transmission plan to reach the transfer of data of low time delay, high-speed, high reliability.
Accompanying drawing explanation
Fig. 1 is the system model schematic diagram of SOFIA;
Fig. 2 is that SOFIA service forwards and transfer of data schematic diagram;
Fig. 3 is multipath information transferring method schematic flow sheet of the present invention;
Fig. 4 is multicast information transmission method schematic flow sheet of the present invention;
Fig. 5 is one embodiment of the invention multipath information transferring method schematic diagram;
Fig. 6 is one embodiment of the invention multicast information transmission method schematic diagram;
Fig. 7 is information transmission system structural representation one of the present invention;
Fig. 8 is information transmission system structural representation two of the present invention.
Wherein, Reference numeral:
1 message transmission mode is set up module 2 multi-path transmission modules
3 message transmission modes are set up module 4 multicast transmission modules
The sub-transport stream module of 11 total transport stream module 12
The sub-transport stream module of 31 total transport stream module 32
S1～S4, S11～S12, S21～S22, S41～S44: the administration step of various embodiments of the present invention
Embodiment
Provide the specific embodiment of the present invention below, in conjunction with diagram, the present invention has been made to detailed description.
Packet while the object of the invention is to reduce the transmission of one-to-many in ICN repeats to copy number of times, improves the effective rate of utilization of transmission link.
First the present invention proposes the message transmission mode of the one-to-many in a kind of ICN, has then realized two kinds of transmission policys based on this pattern: multipath strategy and multicast strategy.Such as: when the same content of multiple client-requested, on link, can there is a large amount of packets that repeats copy, reduce the effective rate of utilization of transmission link.For this reason, propose the multicast strategy based on one-to-many transmission mode, can effectively reduce the copy number of times of packet, reduced link occupancy.Because ICN obtains data content by content name, the request of its information has the irrelevant characteristic in address, has therefore proposed the multipath strategy based on one-to-many transmission mode, can customize neatly dispatching algorithm, accelerate the speed that client data obtains, reduce data acquisition time delay.
A kind of information transferring method based on information centre's network provided by the invention, Fig. 3 is multipath information transferring method schematic flow sheet of the present invention, as shown in Figure 3, the method comprises:
Message transmission mode establishment step S1: for setting up one-to-many message transmission mode, one-to-many message transmission mode is by the total transmission task of a total transport stream maintenance information, and by total transport stream, the total transmission task of information is distributed to multiple sub-transport stream, to realize the communication of one-to-many;
Multi-path transmission step S2: for based on one-to-many message transmission mode, adopt multi-path transmission strategy to carry out the sending and receiving of information.
Message transmission mode establishment step S1 also comprises:
Total transport stream step S11: for the overall status of maintenance information transmission, and based on different distribution policies, total transport stream is distributed to multiple sub-transport stream;
Sub-transport stream step S12: for carrying out communication by sub-transport stream and remote host.
Wherein, multi-path transmission strategy is in message transmitting procedure, selects described sub-transport stream to carry out transfer of data by described total transport stream at request of data end according to different scheduling strategies.
Wherein, multi-path transmission step S2 also comprises:
Send request step S21: sending when data, total transport stream is updated to data content requests in multiple sub-transport stream according to scheduling strategy, and after the parameter of carrying out sub-transport stream arranges, send data content requests by sub-transport stream;
Reception information step S22: receive subdata content from sub-transport stream, and the subdata content receiving is integrated, form complete data content and offer upper level applications use.
The present invention also provides a kind of information transferring method based on information centre's network, and Fig. 4 is multicast information transmission method schematic flow sheet of the present invention, and as shown in Figure 4, method comprises:
Message transmission mode establishment step S3: for setting up one-to-many message transmission mode, one-to-many message transmission mode is by the total transmission task of a total transport stream maintenance information, and by total transport stream, the total transmission task of information is distributed to multiple sub-transport stream, to realize the communication of one-to-many;
Multicast transmission step S4: for based on one-to-many message transmission mode, adopt multicast transmission strategy to carry out information content distribution.
Wherein, message transmission mode establishment step S3 also comprises:
Total transport stream step S31: for the overall status of maintenance information transmission, and based on different distribution policies, total transport stream is distributed to multiple sub-transport stream;
Sub-transport stream step S32: for carrying out communication by sub-transport stream and remote host.
Wherein, multicast transmission strategy is that content supplier sends request of data by described total transport stream to relay router, provides content at relay router by multiple sub-transport stream to multiple request of data ends simultaneously.
Wherein, multicast transmission step S4 also comprises:
Router receives request step S41: router receives after the request of data X of client, the action queries of asking X in router solicitation table;
Set up total transport stream step S42: when router admission receive search matched data request X in request step be operating as relaying RELAY, set up the total transport stream between client and server;
Request polymerization procedure S43: when router continues to receive after the request of data X of other clients, the polymerization of asking, sends a request of data X by up total transport stream to server;
Data dissemination step S44: by the descending data content client that is distributed to each and sends described request of data X by multiple sub-transport stream.
, provide the specific embodiment of the present invention below, with concrete embodiment, the present invention is described in detail by reference to the accompanying drawings.
1, message transmission mode is set up: the message transmission mode of one-to-many in a kind of ICN.It is characterized in that setting up a total transport stream Flow<X> for a certain content X, this Flow can safeguard multiple sub-transport stream SubFlow<Local simultaneously, Remote>, every sub-transport stream is responsible for carrying out communication with different remote hosts.When transmission information, based on scheduling strategy, communication task is distributed to each sub-transport stream by Flow<X>, is transmitted with remote host respectively by each sub-transport stream; While receiving data, the data of being responsible for that by total transport stream each subflow is received are integrated multiplexing, form complete delivery of content to upper layer application.
2, multipath communication: the multi-path transmission strategy (Multipath) based on one-to-many message transmission mode in a kind of ICN.Its essence is by the application of the request of data end in ICN of the message transmission mode shown in 1.It is characterized in that request of data end is by repeatedly sending identical request of data, can set up sub-transport stream with different far-end servers.Sub-transport stream is responsible for and far-end server carries out communication.The network condition information such as the propagation delay time based on customizable scheduling strategy and different sub-transport stream, total transport stream can be done the distribution of transformation task, realizing sooner, communication more neatly.
3, multicast information transmission: the multicast transmission strategy (Multicast) based on one-to-many message transmission mode in a kind of ICN.Its essence is the application on the relay router in ICN by the Information Transmission Model shown in 1.It is characterized in that safeguarding the multicast hierarchical tree starting from server end.Request of data end is the leaf node of tree, the router in network with relay function is the internal node of tree, internal node need to be safeguarded two total transport stream, and up Flow is responsible for communicating by letter with father node, and descending Flow will safeguard a SubFlow for each child nodes.The transmission of information becomes the process that starts to spread to bottom layer node successively from root node.Can support leaf node dynamically add and delete simultaneously.
First, the present invention proposes the message transmission mode of one-to-many in a kind of ICN.Secondly, the design of the message transmission mode based on this one-to-many realizes two kinds of communication strategies: multipath strategy and multicast strategy.Content of the present invention is specifically described as follows:
1, the message transmission mode of one-to-many in ICN
The general implementation of the message transmission mode of one-to-many is first introduced in this part, then take SOFIA architecture as example, tells about concrete application process.
The message transmission mode of one-to-many is a total transport stream of transmission maintenance (Flow) of certain content, and total transport stream is safeguarded again multiple sub-transport stream (SubFlow).Total transport stream is responsible for the overall status (FlowState) of maintenance information transmission, and communication task is distributed to sub-transport stream.Sub-transport stream is responsible for and remote host carries out communication.In the communication of one-to-many, the process of establishing of the transport stream of different transmission policys is different, and the process of establishing of the one-to-many transport stream of multipath strategy and multicast strategy can be described herein below.How the message transmission mode that we specifically narrate one-to-many herein works.
Suppose that host A set up Flow and carried out request content X, and set up subNum bar SubFlow, SubFlow is numbered 0,1,2 ... subNum-1.First need, the request that the request of content X is divided into the sub-content of multiple X, can adopt strategy or other sequence number mode of byte level of piecemeal.If adopt the mode of piecemeal, and represent piecemeal by the form of (NAME:Block), host A can produce a series of sub-block request, Request<X:1>, Request<X:2>, Request<X:3> etc.If adopt uniform scheduling strategy, host A will be distributed to Request<X:blockNum> the transport stream that is numbered (blockNum%subNum), and sub-transport stream can be responsible for request and the reception work of this content blocks.The data block that total transport stream is responsible for each sub-transport stream to receive is integrated, and forms complete data content and offers upper level applications.
In the communication of this one-to-many, can be by information decision network link circuit conditions such as the propagation delay times of each sub-transport stream, thus select the less sub-transport stream of propagation delay time to distribute more transmission request.Or the request of each content sub-block is distributed to all sub-transport stream, then only need to process the sub-block data that receive the earliest.Generally speaking, based on the message transmission mode of this one-to-many, can adopt various scheduling strategies to meet transmission needs.The transmission mode of one-to-many is different with traditional MPTCP in essence.MPTCP has utilized multiple paths to carry out transfer of data on the same TCP of two end points connects, and in the transmission mode of one-to-many, single transport stream can be simultaneously and multiple server end carry out transfer of data.
Take SOFIA architecture as example, specifically tell about the mode of one-to-many and how to realize below.In SOFIA, single client can send multiple service requests by single Service Instance, and each request will be set up a service with far-end and is connected, and has so just formed the mapping of a kind of single local service example to multiple remote service examples.As shown in Figure 2, NIL represents unknown server, if client a sends a service request by local example 1 again for Inst1, client a will be connected with the server d service of setting up so.Suppose that the Service Instance 2 that server d sets up is XInst2, will there is mapping: Inst1-> (XInst1, c) in client a so, (XInst2, d).For client a, here, Inst1 just can regard total transport stream of serving X as, and Inst1-> (XInst1, c) and Inst1-> (XInst2, d) can regard sub-transport stream as.When receiving after the request of data of upper layer application, a both can be by mapping Inst1-> (XInst1, c) send request of data, also can be by mapping Inst1-> (XInst2, d) send request of data, can also, first by request of data piecemeal, then send request of data sub-block with different mappings respectively, this is just corresponding to the scheduling strategy in the message transmission mode of one-to-many.Herein, because server c is identical in the position of network topology with server d, may be better so apply uniform scheduling strategy.Suppose a request X.example.jpeg, be so just divided into X.example.jpeg:1, X.example.jpeg:2 etc., and issue equably different remote service examples.Far-end server is received after data block request, can calculate data-bias with block size by piece number, takes out respective data blocks content, and composition data bag replies to client.Certainly, need to appoint with far-end server in advance the size (in SOFIA, a data block is 1024 bytes) of data block.After Inst1 receives that data block is replied, need the out of order and integrity issue of process data block, data are passed to upper layer application after completing integration again.
2, based on a pair of multimodal multi-path transmission strategy
The essence of the multipath strategy in ICN is that the Information Transmission Model of one-to-many in ICN in this paper is in the application of request of data end.While adopting multipath strategy to carry out transfer of data in ICN, total transport stream Flow<X> is responsible for safeguarding the state FlowState of total transmission information, each sub-transport stream SubFlow is responsible for to far-end server request and transmission data separately, and safeguards transmission state SubFlowState.Concerning upper level applications, it only sees a single total transport stream Flow, and in the time of transfer of data, the scheduling mechanism by Flow based on special carrys out chooser transport stream SubFlow<Client, Server> carries out actual transfer of data.
Fig. 5 is one embodiment of the invention multipath information transferring method schematic diagram, is illustrated in figure 5 an example that carries out multipath strategy and carry out transfer of data in ICN.At the beginning, the request of the content X that client a sends is routed device R1 and R2 is transmitted to server b.On client a, total transport stream Flow<X> of request X only has a sub-transport stream SubFlow<a, b>.In order to increase the throughput of transfer of data of Flow<X>, client a can resend the request of obtaining content X.If b has the another one network address, b can be by a new SubFlow<b so, and a> is tied to in the communicating by letter of client a.Other the server c that X content is provided and d also can bind and flow to a.Now, total transport stream Flow<X> of a has had 3 sub-transport stream flow, respectively SubFlow<a, b>, SubFlow<a, c>, SubFlow<a, d>.Client a can pass through dispatching algorithm now, obtains content X by three subflow SubFlow.And in the transmitting procedure of data, can dynamically add or delete subflow SubFlow.
Different from traditional multi-path transmission protocol, the multipath policy data transmission in ICN can make full use of multiple different servers, rather than some specific servers.The flow chart of data processing of multipath strategy is as follows: multipath strategy need to be carried out in the protocol stack of client.The process of establishing of stream has been responsible for by protocol stack.Following false code is mainly described the relevant treatment flow process of the client that adopts multipath strategy in the time sending data and receive data.In the time sending data, first traffic control strategy, the data content of wanting and information (piece number or sequence number etc.) are updated in each subflow subFlow, and the args field of subFlow is set, data field is copied in subFlow from main Flow according to args parameter, then each subflow is called to send process, send corresponding request of data.
In the time processing receiving course, first in each subflow of total transport stream main, receive data.When receiving after data, travel through all subflows, according to the args field of subflow (parameter field arranging when transmission), the data of receiving in subflow are inserted in total transport stream (main->data).After twice traversal, in main, just obtain partial data content.Through such processing, just complete the multiplex process of each transmission subflow data.Concerning upper layer application, the multipath strategy of bottom is transparent.
3, based on a pair of multimodal multicast transmission strategy
Multicast strategy is a kind of network function, and it can promote the distribution of information effectively.We by the multicast policy definition of content in ICN are: single content supplier provides contents distribution to one group of request of data end by total transport stream Flow simultaneously.In order to realize this function, need to support the ICN router of multicast strategy to coordinate.The router of ICN need to possess the function of relaying, and it can carry out polymerization by the request of multiple clients, then by up Flow, sends a request of data to ICN router or the content supplier on upper strata.Descending Flow is responsible for to client distributing data, so descending Flow need to safeguard multiple SubFlow, each SubFlow and a client are carried out transfer of data.Receive after data at up Flow, data are copied to the SubFlow of descending Flow and send.
Fig. 6 is one embodiment of the invention multicast information transmission method schematic diagram, Figure 6 shows that an example that carries out multicast strategy and carry out transfer of data in ICN.Suppose that content X is a content that needs multicast characteristic, a, b and c are client (Consumer), and d is server (Server), and router R(Router in ICN) be RELAY to the operational motion that should ask in transmitting.In the time that router R receives a request from client a, it can be by the request field of packet as KEY, the required list of querying router so.Because operation corresponding to request X is RELAY, router meeting active and client a and server d set up respectively a total transport stream Flow so.When receive from client b and c the request for content X time, router is found content X have been made to relaying before it, therefore, router can be set up sub-transport stream SubFlow with client b and c respectively, and will can not forwarded from the request of client b and c again.A now, b and c have subscribed to X content on router.Content supplier only need to copy portion by content and send to router, and router is responsible for X contents distribution to client a, b and c.
Between client and service end, can there be multiple routers with relay function.The all stream starting from server can form a multicast tree.Only need to be to content be once copied to transmission on every limit of tree.Client a, by sending a Terminate Packet to relay router R, exits multicast process.Receiving after the Terminate Packet that client a sends the flow transmission (disconnecting a strip transport stream) of router active disconnection and client a.If all down-stream entities (may be client or relay router) have all been cancelled the subscription to content X on relay router R, router R just can disconnect the flow transmission of it and up-stream router so.After server and all relay routers all disconnect flow transmission, the processing of multicast strategy is just through with.The flow chart of data processing of multicast strategy is as follows:
In the time that request bag arrives router, can first search the content of router and transmit, carry out corresponding actions according to the corresponding entry inquiring.If the forwarding rule of this content is RELAY, inquires about this router and whether set up flow transmission with far-end server.If router does not also have and server is set up flow transmission, first and server is set up up total transport stream server_Flow, then produce a descending total transport stream client_Flow, a newly-built sub-transport stream SubFlow<local in this client_Flow, remote>, is responsible for and this client communication.If router has been set up flow transmission passage server_Flow with far-end server, if in client_Flow and newly to client set up subflow SubFlow<local, remote> transmits.In addition, need to safeguard the mapping of Server_Flow to Client_Flow on relay router, with FlowMap<Flow1, Flow2> realizes.The processing procedure of core is shown in false code handle_request.
In the time that router is received the data from server from server_Flow, first according to FlowMap, corresponding being responsible for and client_Flow that all clients are carried out information transmission of server_Flow found in mapping.The data that server_Flow is received copy in each the sub-transport stream of ClientFlow, finally every sub-transport stream are all called to send function, send the data to each client.The core false code of processing procedure is shown in handle_data.
The present invention also provides a kind of information transmission system based on information centre's network, adopts the described information transferring method based on information centre's network, and Fig. 7 is information transmission system structural representation one of the present invention, and as shown in Figure 7, this system comprises:
Message transmission mode is set up module 1: for setting up one-to-many message transmission mode, one-to-many message transmission mode is by the total transmission task of a total transport stream maintenance information, and by total transport stream, the total transmission task of information is distributed to multiple sub-transport stream, to realize the communication of one-to-many;
Multi-path transmission module 2: for based on one-to-many message transmission mode, adopt multi-path transmission strategy to carry out the sending and receiving of information.
Wherein, message transmission mode is set up module 1 and is also comprised:
Total transport stream module 11: for the overall status of maintenance information transmission, and based on different distribution policies, total transport stream is distributed to multiple sub-transport stream;
Sub-transport stream module 12: for carrying out communication by sub-transport stream and remote host.
The present invention also provides a kind of information transmission system based on information centre's network, adopt as described in information transferring method based on information centre's network, Fig. 8 is information transmission system structural representation two of the present invention, as shown in Figure 8, this system comprises:
Message transmission mode is set up module 3: for setting up one-to-many message transmission mode, one-to-many message transmission mode is by the total transmission task of a total transport stream maintenance information, and by total transport stream, the total transmission task of information is distributed to multiple sub-transport stream, to realize the communication of one-to-many;
Multicast transmission module 4: for based on one-to-many message transmission mode, adopt multicast transmission strategy to carry out information content distribution.
Wherein, message transmission mode is set up module 3 and is also comprised:
Total transport stream module 31: for the overall status of maintenance information transmission, and based on different distribution policies, total transport stream is distributed to described multiple sub-transport stream;
Sub-transport stream module 32: for carrying out communication by sub-transport stream and remote host.
Certainly; the present invention also can have other various embodiments; in the situation that not deviating from spirit of the present invention and essence thereof; those of ordinary skill in the art are when making according to the present invention various corresponding changes and distortion, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (12)
1. the information transferring method based on information centre's network, is characterized in that, described method comprises:
Message transmission mode establishment step: for setting up one-to-many message transmission mode, described one-to-many message transmission mode is by the total transmission task of a total transport stream maintenance information, and by described total transport stream, the described total transmission task of information is distributed to multiple sub-transport stream, to realize the communication of one-to-many;
Multi-path transmission step: for based on described one-to-many message transmission mode, adopt multi-path transmission strategy to carry out the sending and receiving of information.
2. the information transferring method based on information centre's network according to claim 1, is characterized in that, described message transmission mode establishment step also comprises:
Total transport stream step: for the overall status of maintenance information transmission, and based on different distribution policies, described total transport stream is distributed to described multiple sub-transport stream;
Sub-transport stream step: for carrying out communication by described sub-transport stream and remote host.
3. the information transferring method based on information centre's network according to claim 1, it is characterized in that, described multi-path transmission strategy is in message transmitting procedure, selects described sub-transport stream to carry out transfer of data by described total transport stream at request of data end according to different scheduling strategies.
4. the information transferring method based on information centre's network according to claim 1, is characterized in that, described multi-path transmission step comprises:
Send request step: sending when data, described total transport stream is updated to data content requests in described multiple sub-transport stream according to scheduling strategy, and after the parameter of carrying out described sub-transport stream arranges, send described data content requests by described sub-transport stream;
Reception information step: receive subdata content from described sub-transport stream, and the described subdata content receiving is integrated, form complete data content and offer upper level applications use.
5. the information transmission system based on information centre's network, adopts the information transferring method based on information centre's network as described in any one in claim 1-4, it is characterized in that, described system comprises:
Message transmission mode is set up module: for setting up one-to-many message transmission mode, described one-to-many message transmission mode is by the total transmission task of a total transport stream maintenance information, and by described total transport stream, the described total transmission task of information is distributed to multiple sub-transport stream, to realize the communication of one-to-many;
Multi-path transmission module: for based on described one-to-many message transmission mode, adopt multi-path transmission strategy to carry out the sending and receiving of information.
6. the information transmission system based on information centre's network according to claim 5, is characterized in that, described message transmission mode is set up module and also comprised:
Total transport stream module: for the overall status of maintenance information transmission, and based on different distribution policies, described total transport stream is distributed to described multiple sub-transport stream;
Sub-transport stream module: for carrying out communication by described sub-transport stream and remote host.
7. the information transferring method based on information centre's network, is characterized in that, described method comprises:
Message transmission mode establishment step: for setting up one-to-many message transmission mode, described one-to-many message transmission mode is by the total transmission task of a total transport stream maintenance information, and by described total transport stream, the described total transmission task of information is distributed to multiple sub-transport stream, to realize the communication of one-to-many;
Multicast transmission step: for based on described one-to-many message transmission mode, adopt multicast transmission strategy to carry out information content distribution.
8. the information transferring method based on information centre's network according to claim 7, is characterized in that, described message transmission mode establishment step also comprises:
Total transport stream step: for the overall status of maintenance information transmission, and based on different distribution policies, described total transport stream is distributed to described multiple sub-transport stream;
Sub-transport stream step: for carrying out communication by described sub-transport stream and remote host.
9. the information transferring method based on information centre's network according to claim 7, it is characterized in that, described multicast transmission strategy is that content supplier sends request of data by described total transport stream to relay router, provides content at described relay router by described multiple sub-transport stream to multiple request of data ends simultaneously.
10. the information transferring method based on information centre's network according to claim 7, is characterized in that, described multicast transmission step also comprises:
Router receives request step: router receives after the request of data X of client, the action queries of asking X in router solicitation table;
Set up total transport stream step: when described router described admission receive in request step, search matched data request X be operating as relaying RELAY, set up the described total transport stream between client and server;
Request polymerization procedure: when described router continues to receive after the described request of data X of other clients, the polymerization of asking, sends a described request of data X by up described total transport stream to server;
Data dissemination step: by the descending data content client that is distributed to each and sends described request of data X by multiple sub-transport stream.
11. 1 kinds of information transmission systems based on information centre's network, adopt the information transferring method based on information centre's network as described in any one in claim 7-10, it is characterized in that, described system comprises:
Message transmission mode is set up module: for setting up one-to-many message transmission mode, described one-to-many message transmission mode is by the total transmission task of a total transport stream maintenance information, and by described total transport stream, the described total transmission task of information is distributed to multiple sub-transport stream, to realize the communication of one-to-many;
Multicast transmission module: for based on described one-to-many message transmission mode, adopt multicast transmission strategy to carry out information content distribution.
12. according to the information transmission system based on information centre's network described in claim 11, it is characterized in that, described message transmission mode is set up module and also comprised:
Total transport stream module: for the overall status of maintenance information transmission, and based on different distribution policies, described total transport stream is distributed to described multiple sub-transport stream;
Sub-transport stream module: for carrying out communication by described sub-transport stream and remote host.
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