CN110445599B - Content-oriented Internet of things networking data communication synchronous transmission method - Google Patents
Content-oriented Internet of things networking data communication synchronous transmission method Download PDFInfo
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- CN110445599B CN110445599B CN201910581536.XA CN201910581536A CN110445599B CN 110445599 B CN110445599 B CN 110445599B CN 201910581536 A CN201910581536 A CN 201910581536A CN 110445599 B CN110445599 B CN 110445599B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/1607—Details of the supervisory signal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L7/00—Arrangements for synchronising receiver with transmitter
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/001—Synchronization between nodes
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Abstract
The invention discloses a synchronous transmission method of networking data communication of an Internet of things facing to content, wherein the data communication takes the content as a core and is driven by a data object request end, the data object request end sends a request packet with a required data identifier, and once the request packet reaches a node with request data, both the data object request end and the data object issuing end have transmission state return values of the transmission packet; the transmission state return value is used as a judgment basis for successful data transmission, the judgment is carried out at both ends of the communication, and if the transmission state return value is a return value during successful receiving and sending, one-time data transmission is finished; otherwise, the data object request end carries out data request again until the data transmission is completed, and the data object request end and the data object release end can realize one-to-one matching and synchronous receiving and sending of data persistent transmission in the circulation manner. The invention can satisfy the clock synchronization transmission of data between the routing nodes in the content-oriented networking of the Internet of things.
Description
Technical Field
The invention belongs to the field of networking communication of the Internet of things, and particularly relates to a clock synchronization problem of data transmission among networking routing nodes of the Internet of things for content.
Background
An Information-Centric Networking (ICN) is a brand-new Internet communication system architecture, takes data content as a core, the main body of data transmission is a data packet with identification (naming), the transmission is driven by the mapping relation between the identification (naming) and the data, and the transmission is unrelated to the position of the data in the network, and has the advantages of strong mobility, independence on network addresses, independence on connection sessions, multiple addressing, multiple networks and the like. The method fundamentally changes the encapsulation structure and the addressing mode of the IP packet, is beneficial to the cross-region switching of the mobile communication equipment, reduces the communication time delay, and solves the problems that the traditional Internet architecture cannot deal with high-speed mobile communication, the IP address space is exhausted, the network transmission efficiency is low, the safety is poor and the like.
A Named Data Network (NDN) is a basic research information center network project of future Internet architecture special research, the communication strategy of the named Data network is completely driven by a request party, the request party broadcasts a request packet to a network, and the named Data network is based on two transmission packet types, one type is a request packet (Interest), the other type is a Data packet (Data), and the two types are matched according to complete or relative names. The data names are completely transparent to the underlying network, so that each application program can make own data naming rules according to own requirements, and a hierarchical structure is adopted, so that matching according to the longest common prefix of the names in the transmission process is facilitated. The data packet can be cached by the router in the transmission process so as to meet the following same data resource request, thereby realizing the multiplexing of data. The method not only avoids network conflict and congestion in principle, gets rid of dependence of transmission on end-to-end connection, thoroughly realizes multilink routing, realizes content sharing and intelligent forwarding in the real sense, reduces network load and improves the transmission rate of data in the network.
As a novel Internet communication model which takes data content as a core and takes user requirements as a guide, the data transmission of the novel Internet communication model is independent of the position, and support is provided for the expansibility and the mobility required by the Internet of things. In the automatic data transmission process of the content-oriented networking of the internet of things, once the names of the transmission packets are not successfully matched, data transmission is interrupted, the transmission packets are overtime for a long time, and the data transmission process needs to be manually recovered. Therefore, how to ensure one-to-one matching and synchronous transceiving of transmission packets between data transceiving ends is an urgent problem to be solved in order to enable more efficient and reliable transmission.
Disclosure of Invention
The invention provides a content-oriented Internet of things networking data communication synchronous transmission method aiming at the problem of content-oriented Internet of things networking data communication clock synchronization.
In order to solve the technical problems, the invention provides a content-oriented networking data communication synchronous transmission method of the Internet of things, wherein data communication is driven by a data object request end by taking content as a core, the data object request end sends a request packet with a required data identifier, and once the request packet reaches a node with request data, the data object request end and the data object issuing end both have transmission state return values of the transmission packet; and taking the transmission state return value as a judgment basis for successful data transmission, and realizing one-to-one matching and synchronous receiving and transmitting of data persistent transmission of a data object request end and a data object release end.
Further, the transmission state return value is used as a judgment basis for successful data transmission, and whether one-time data communication is completed is judged by judging the transmission state return values of the transmission packets of the data object request end and the data object issuing end; if the data is a return value when the data is successfully received and transmitted, completing one-time data transmission and preparing for next communication; if the return value of one end is different from that of successful receiving and sending, the data object request end makes data request again, and the process is circulated; until the data transmission is completed.
A data object request end sends a request packet for requesting data, and a transmission state return value of the request packet is stored in a document; judging whether the return value is the requested content data, if so, changing the request packet identifier by the data object request end according to a certain naming rule, and carrying out next communication; if not, keeping the transmission packet identifier unchanged until the transmission is successful; the data object issuing end receives the request packet sent by the data object request end, inquires a content routing table to perform name matching of the content data packet, generates a transmission state return value, and stores the transmission state return value into a document; judging whether the return value is the value when the content data packet is normally returned, if so, changing the identification of the transmission packet by the data object issuing end according to the same naming rule to carry out data packaging and carry out next communication; if not, keeping the transmission packet identification unchanged until the transmission is successful.
Compared with the prior art, the invention has the beneficial effects that: through double judgment of two communication ends, accuracy and high efficiency of data synchronous transmission are further guaranteed, and therefore one-to-one matching and synchronous receiving and sending of data persistent transmission can be achieved.
Drawings
FIG. 1 is a flowchart of a procedure for a data object request side one-time data synchronous transmission communication in a named data network
FIG. 2 is a flowchart of a procedure for one-time data synchronous transmission communication at a data object issuing end in a named data network
Detailed Description
The invention will be further described with reference to the following figures and specific examples, which are not intended to limit the invention in any way.
In the named data network, the identification of a transmission packet is a data name, the transmission packet is essentially a binary object consisting of a series of components, a hierarchical structure is adopted, a data naming rule can be formulated according to the requirement of the transmission packet, matching is carried out according to the longest public prefix of the name in the transmission process, and data communication can be carried out after the two communication parties establish connection in the same Wifi environment. The data object request end sends a data request packet carrying the request data name, and when the request packet is correctly responded, the request end generates an explicit transmission state return value. Correspondingly, when a request packet requesting data reaches a data object issuing end, a content routing table is inquired to perform name matching of the content data packet, if the same name or the same longest common prefix entry is available, the request packet is responded, the content data packet is returned along the sending path of the request packet, and meanwhile, an explicit transmission state return value is generated.
The invention provides a synchronous transmission method of networking data communication of an Internet of things facing to contents, wherein the data communication takes contents as a core and is driven by a data object request end, the data object request end sends a request packet with a required data identifier, and once the request packet reaches a node with request data, the data object request end and a data object issuing end both have transmission state return values of the transmission packet; the transmission state return value is used as a judgment basis for successful data transmission, and whether one-time data communication is completed is judged by judging the transmission state return values of the transmission packets of the data object request end and the data object release end; if the data is a return value when the data is successfully received and transmitted, completing one-time data transmission and preparing for next communication; if the return value of one end is different from that of successful receiving and sending, the data object request end makes data request again, and the process is circulated until data transmission is completed, so that one-to-one matching and synchronous receiving and sending of data persistent transmission of the data object request end and the data object release end are realized.
Example 1:
in the invention, a specific example of data synchronous transmission communication of a data object request end in the internet of things applying a named data network is as follows:
a data object request end generates a data request packet carrying a request data name and carries out routing forwarding, a generated transmission state return value is stored in a document, a data value in the document is extracted for judgment, whether the return value is the requested content data or not is judged, if the return value is the same as the return value of unsuccessful data communication, the condition that the routing of two communication ends is not normally connected or an item using the name as a prefix does not exist in a content routing table of a data object distribution end is shown, namely the content data packet is not successfully returned and received, the name carried by the request packet is kept unchanged, and the name is continuously used for trying data transmission until the data transmission is successful; if the return value is other value, the data content requested is received, which indicates that the data transmission at two communication ends is successful, the data object request end automatically changes the name carried by the request packet according to a certain naming rule, prepares for the next data communication, and circulates in such a way, thereby realizing the one-to-one matching and synchronous receiving and sending of the request packet and the content data packet for permanent transmission. The program flow chart is shown in fig. 1.
Example 2:
in the invention, a specific example of data synchronous transmission communication of a data object publishing terminal in the internet of things applying a named data network is as follows:
and the data object issuing end inquires a content routing table according to the request data name carried by the data request packet, performs name matching on the content data packet, responds to the request packet sent by the request end through a returned content data packet, and generates a transmission state return value. Execute "echo $? The command judges the return state of the content data packet, stores the return value of the command into a document, judges whether the return value is the value when the content data packet normally returns, if the return value is the same as the return value of successful data communication when the route is normally connected, the data name or an entry with the name as the prefix exists in the content routing table of the routing node, the issuing end returns the content data packet to complete one-time data transmission, and simultaneously adopts the same naming rule as the data object request end to automatically change the name of the inquired content data packet (namely the identification of the transmission packet) to prepare for the next data communication. If the return value is other values, the query name is kept unchanged until the transmission is successful, and the process is circulated, so that the one-to-one matching and synchronous receiving and sending of the request packet and the content data packet are realized. The program flow chart is shown in fig. 2.
In summary, the content-oriented data communication of the networking of the internet of things of the invention is driven by the data object request terminal by taking the content as a core. The data object request end sends a request packet with a required data identifier, and once the request packet reaches a node with request data, a data packet with the data identifier and data content is returned. By taking the wireless data communication of the Internet of things adopting a named data network system architecture as an example, the one-to-one matching and synchronous receiving and sending of data persistent transmission are achieved by judging the return value of the transmission state of the transmission packets of two communication parties.
While the present invention has been described with reference to the accompanying drawings, the present invention is not limited to the above-described embodiments, which are illustrative only and not restrictive, and various modifications which do not depart from the spirit of the present invention and which are intended to be covered by the claims of the present invention may be made by those skilled in the art.
Claims (1)
1. A synchronous transmission method for networking data communication of Internet of things facing to content is characterized in that the data communication takes content as a core and is driven by a data object request end, the data object request end sends a request packet with a required data identifier, and once the request packet reaches a node with request data, the data object request end and a data object publishing end both have transmission state return values of the transmission packet; the method is characterized in that the transmission state return value is used as a judgment basis for successful data transmission, so that one-to-one matching and synchronous transceiving of data persistent transmission of a data object request end and a data object release end are realized, and the specific contents are as follows:
the data object request end is driven by the data object request end, the data object request end sends a request packet with a required data identifier, and once the request packet reaches a node with request data, the data object request end and the data object publishing end both have a transmission state return value of a transmission packet; the transmission state return value is used as a judgment basis for successful data transmission, and whether one-time data communication is completed is judged by judging the transmission state return values of the transmission packets of the data object request end and the data object release end; if the data is a return value when the data is successfully received and transmitted, completing one-time data transmission and preparing for next communication; if the return value of one end is different from that of successful receiving and sending, the data object request end makes data request again, and the process is circulated until data transmission is completed, so that one-to-one matching and synchronous receiving and sending of data persistent transmission of the data object request end and the data object release end are realized;
a data object request end generates a data request packet carrying a request data name and carries out routing forwarding, a generated transmission state return value is stored in a document, a data value in the document is extracted for judgment, whether the return value is the requested content data or not is judged, if the return value is the same as the return value of unsuccessful data communication, the condition that the routing of two communication ends is not normally connected or an item using the name as a prefix does not exist in a content routing table of a data object distribution end is shown, namely the content data packet is not successfully returned and received, the name carried by the request packet is kept unchanged, and the name is continuously used for trying data transmission until the data transmission is successful; if the return value is other value, the data content requested is received, which indicates that the data transmission at two communication ends is successful, the data object request end automatically changes the name carried by the request packet according to a certain naming rule, prepares for the next data communication, and circulates in such a way, thereby realizing the one-to-one matching and synchronous receiving and sending of the request packet and the content data packet for permanent transmission.
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