CN109347850B

CN109347850B - Fusion network and method for realizing ICN and TCP/IP network intercommunication

Info

Publication number: CN109347850B
Application number: CN201811307659.6A
Authority: CN
Inventors: 谢人超; 黄韬; 欧思维; 刘江; 刘韵洁
Original assignee: Beijing University of Posts and Telecommunications
Current assignee: Beijing University of Posts and Telecommunications
Priority date: 2018-11-05
Filing date: 2018-11-05
Publication date: 2020-04-24
Anticipated expiration: 2038-11-05
Also published as: CN109347850A

Abstract

The embodiment of the invention provides a fusion network and a method for realizing the intercommunication of an ICN and a TCP/IP network, wherein the network architecture of the fusion network provided by the embodiment of the invention is as follows: compared with the existing convergence network which takes the ICN network as the backbone network, the convergence network provided by the embodiment of the invention has much smaller change on the TCP/IP network architecture in the existing application, so that the convergence of the ICN network and the TCP/IP network can be realized in a larger scale by utilizing the TCP/IP network architecture in the existing application.

Description

Fusion network and method for realizing ICN and TCP/IP network intercommunication

Technical Field

The invention relates to the technical field of convergence and intercommunication of an ICN (integrated circuit network) and a TCP/IP (transmission control protocol/internet protocol) network, in particular to a convergence network and a method for realizing the intercommunication of the ICN and the TCP/IP network.

Background

An existing Network architecture for implementing convergence and interworking between an Information-Centric-Network (ICN) and a TCP/IP Network generally uses the ICN Network as a backbone Network and the TCP/IP Network as an edge Network, that is, an IP-ICN-IP Network architecture, and the Network architecture only supports one communication mode: IP-ICN-IP. The ICN network is an internet architecture for data transmission based on the content concerned by the user, and the TCP/IP network is an internet architecture for data transmission based on the IP address.

However, the inventor finds that the prior art has at least the following disadvantages in the process of implementing the invention: the ICN network is a future network architecture in a research stage, while the TCP/IP network is a mature existing network architecture that has already been put into use, and a gradual process is required to replace the mature existing network with the future network in the research stage, so that it is difficult to implement the convergence and interworking between the ICN network and the TCP/IP network in a large scale by using the ICN network as a backbone network.

Disclosure of Invention

The embodiment of the invention aims to provide a converged network and a method for realizing the intercommunication of an ICN and a TCP/IP network, so as to solve the problem of difficult realization of the converged intercommunication of the ICN and the TCP/IP network in a large scale. The specific technical scheme is as follows:

in order to achieve the above object, in a first aspect, an embodiment of the present invention provides a converged network for implementing interworking between an ICN and a TCP/IP network, where the converged network includes: a TCP/IP backbone network, a plurality of edge ICN networks and a plurality of first border gateways; each edge ICN network is in communication connection with the TCP/IP backbone network through a first border gateway;

a source edge ICN network in each edge ICN network generates an ICN protocol format data request containing the content name of target data according to a user request and sends the ICN protocol format data request to a source first boundary gateway in communication connection with the source edge ICN network;

the source first boundary gateway receives an ICN protocol format data request sent by a source edge ICN network in communication connection with the source first boundary gateway; determining the IP address of a target first border gateway according to the prefix of the content name of the target data contained in the data request and the corresponding relation between the preset prefix of the content name and the IP address of the first border gateway; converting the data request into a TCP/IP protocol format data request which takes the IP address of the first border gateway as a source IP address and the IP address of the target first border gateway as a target IP address, and sending the data request to a TCP/IP backbone network;

the TCP/IP backbone network receives a data request in a TCP/IP protocol format sent by the source first border gateway; sending the data request to a target first border gateway according to the IP address of the target first border gateway contained in the data request;

the destination first border gateway receives a TCP/IP protocol format data request sent by the TCP/IP backbone network; obtaining the IP address of the source first border gateway and the content name of the target data from the data request; storing the corresponding relation between the content name of the target data and the IP address of the source first boundary gateway; converting the data request into an ICN protocol format data request; sending the data request to a destination edge ICN network in communication connection with the data request;

the destination edge ICN network receives an ICN protocol format data request sent by the destination first edge gateway; acquiring data content corresponding to the content name of the target data according to the data request; returning a request result containing the content name of the target data and the data content to the target first border gateway in an ICN protocol format;

the destination first border gateway further receives an ICN protocol format request result returned by the destination edge ICN network; obtaining the content name of the target data in the request result, and obtaining the IP address of the source first border gateway according to the corresponding relation between the stored content name of the target data and the IP address of the source first border gateway; converting the request result into a TCP/IP protocol format which takes the IP address of the first border gateway as a source IP address and the IP address of the first border gateway as a destination IP address; and returning the request result to the TCP/IP backbone network;

the TCP/IP backbone network further receives a TCP/IP protocol format request result returned by the destination first border gateway; returning the request result to the source first border gateway according to the IP address of the source first border gateway contained in the request result;

the source first border gateway further receives a TCP/IP protocol format request result returned by the TCP/IP backbone network; converting the request result into an ICN protocol format request result and returning the ICN protocol format request result to a source edge ICN network in communication connection with the ICN protocol format request result;

the source edge ICN network further receives a request result in an ICN protocol format returned by the first edge gateway in communication connection with the source edge ICN network; and outputting the data content in the request result to the user.

Optionally, the converged network further includes a plurality of TCP/IP edge networks and a plurality of second border gateways; each edge TCP/IP network is in communication connection with the TCP/IP backbone network through a second border gateway;

a source edge ICN network in each edge ICN network generates an ICN protocol format data request containing a Uniform Resource Locator (URL) of target data according to a user request and sends the ICN protocol format data request to a source first boundary gateway in communication connection with the source edge ICN network;

the source first boundary gateway receives an ICN protocol format data request sent by an edge ICN network in communication connection with the source first boundary gateway; according to the URL contained in the data request, determining the IP address of the destination server through domain name resolution; converting the data request into a TCP/IP protocol format data request which takes the IP address of the first border gateway as a source IP address and the IP address of the destination server as a destination IP address, and sending the data request to a TCP/IP backbone network;

the TCP/IP backbone network receives a data request in a TCP/IP protocol format sent by the source first border gateway; determining the IP address of a destination second border gateway according to the IP address of the destination server contained in the data request, and sending the data request to the destination second border gateway;

the destination second border gateway receives a TCP/IP protocol format data request sent by the TCP/IP backbone network; and sending the data request to a destination edge TCP/IP network in communication connection with the data request;

the destination edge TCP/IP network receives a TCP/IP protocol format data request sent by the destination second border gateway; obtaining data content corresponding to the URL from the destination server according to the data request; returning a request result containing the URL and the data content to the destination second border gateway in a TCP/IP protocol format;

the destination second border gateway further receives a TCP/IP protocol format request result returned by the destination edge TCP/IP network; returning the request result to the TCP/IP backbone network;

the TCP/IP backbone network further receives a TCP/IP protocol format request result returned by the destination second border gateway; returning the request result to the source first border gateway according to the source IP address in the request result;

Optionally, a source edge TCP/IP network in each edge TCP/IP network generates a TCP/IP protocol format data request including a content name of the target data according to a user request, and sends the TCP/IP protocol format data request to a source second border gateway in communication connection with the source edge TCP/IP network;

the source second border gateway receives a TCP/IP protocol format data request sent by an edge TCP/IP network in communication connection with the source second border gateway; determining the IP address of a target first border gateway according to the prefix of the content name of the target data contained in the data request and the corresponding relation between the preset prefix of the content name and the IP address of the first border gateway; sending a TCP/IP protocol format data request which takes the IP address of a client sending a user request as a source IP address and takes the IP address of the first border gateway as a destination IP address to a TCP/IP backbone network;

the TCP/IP backbone network receives a data request in a TCP/IP protocol format sent by the source second border gateway; sending the data request to a target first border gateway according to the IP address of the target first border gateway contained in the data request;

the destination first border gateway receives a TCP/IP protocol format data request sent by the TCP/IP backbone network; obtaining the IP address of the client and the content name of the target data from the data request; storing the corresponding relation between the content name of the target data and the IP address of the client; converting the data request into an ICN protocol format data request; sending the data request to a destination edge ICN network in communication connection with the data request;

the destination first border gateway further receives an ICN protocol format request result returned by the destination edge ICN network; obtaining the content name of the target data in the request result, and obtaining the IP address of the source first border gateway according to the corresponding relation between the stored content name of the target data and the IP address of the client; converting the request result into a TCP/IP protocol format which takes the IP address of the first border gateway as a source IP address and the IP address of the client as a destination IP address; and returning the request result to the TCP/IP backbone network;

the TCP/IP backbone network further receives a TCP/IP protocol format request result returned by the destination first border gateway; determining the IP address of the source second border gateway according to the IP address of the client contained in the request result; returning the request result to the source second border gateway;

the source second border gateway further receives a TCP/IP protocol format request result returned by the TCP/IP backbone network; according to the IP address of the client side contained in the request result, returning the request result to a source edge TCP/IP network in communication connection with the request result;

the source edge TCP/IP network further receives a request result in a TCP/IP protocol format returned by a second border gateway in communication connection with the source edge TCP/IP network; and outputting the data content in the request result to a user according to the IP address of the client.

Optionally, the converged network further includes an electronic device, which is in communication connection with the TCP/IP backbone network;

when each edge ICN network joins the converged network, a first border gateway with a communication connection with the edge ICN network joins the converged network, and the first border gateway establishes a communication connection with the converged network;

the electronic equipment allocates corresponding named prefixes to each edge ICN network when the edge ICN network joins the converged network;

the edge ICN network sends the assigned named prefix and the IP address of the first border gateway of the edge ICN network to all the first border gateways and all the second border gateways in the converged network;

each first border gateway and each second border gateway in the converged network receive the message sent by the edge ICN network, and store the received naming prefix and the IP address of the first border gateway in a centralized manager table of the first border gateway in a key-value pair mode;

the source first border gateway or the source second border gateway queries a centralized manager table of the source first border gateway or the source second border gateway according to a prefix of a content name of target data contained in the data request; and determining the IP address of the first border gateway corresponding to the named prefix which is longest matched with the prefix of the content name of the data request as the IP address of the target first border gateway.

Optionally, when receiving a data request sent by the TCP/IP backbone network, the destination first border gateway stores a content name of target data and an IP address of the source first border gateway, which are obtained from the data request, in a temporary mapping table of the destination first border gateway in a form of a key-value pair;

or storing the content name of the target data obtained from the data request and the IP address of the client in a temporary mapping table of the client in a key-value pair mode.

In a second aspect, an embodiment of the present invention provides a communication method applied to the converged network, where the method includes:

the source first boundary gateway receives an ICN protocol format data request sent by an edge ICN network in communication connection with the source first boundary gateway; determining the IP address of a target first border gateway according to the prefix of the content name of the target data contained in the data request and the corresponding relation between the preset prefix of the content name and the IP address of the first border gateway; converting the data request into a TCP/IP protocol format data request which takes the IP address of the first border gateway as a source IP address and the IP address of the target first border gateway as a target IP address, and sending the data request to a TCP/IP backbone network;

Optionally, the converged network further includes: a plurality of edge TCP/IP networks and a plurality of second border gateways; each edge TCP/IP network establishes communication connection with the TCP/IP backbone network through a second border gateway;

Optionally, the method further includes:

a source edge TCP/IP network in each edge TCP/IP network generates a TCP/IP protocol format data request containing the content name of the target data according to a user request and sends the TCP/IP protocol format data request to a source second border gateway in communication connection with the source edge TCP/IP network;

each first border gateway and each second border gateway in the network receive the message sent by the edge ICN network, and store the received naming prefix and the IP address of the first border gateway in a centralized manager table of the first border gateway in a key value pair mode;

the step of determining the IP address of the destination first border gateway, according to the prefix of the content name of the target data included in the data request, by the source first border gateway or the source second border gateway, includes:

inquiring a centralized manager table of the data request according to the prefix of the content name of the target data contained in the data request;

and determining the IP address of the first border gateway corresponding to the named prefix which is longest matched with the prefix of the content name of the data request as the IP address of the target first border gateway.

Optionally, the step of storing, by the destination first border gateway, a correspondence between a content name of the target data and an IP address includes:

when a data request sent by the TCP/IP backbone network is received, storing the content name of target data and the IP address of a source first border gateway obtained from the data request in a temporary mapping table of the IP address of the source first border gateway in a key value pair mode;

The embodiment of the invention provides a fusion network and a method for realizing the intercommunication of an ICN and a TCP/IP network, which can realize a source edge ICN network in each edge ICN network, generate an ICN protocol format data request containing the content name of target data according to a user request, and send the ICN protocol format data request to a source first border gateway in communication connection with the ICN protocol format data request; the source first border gateway receives an ICN protocol format data request sent by an edge ICN network in communication connection with the source first border gateway, determines an IP address of a target first border gateway according to a prefix of a content name of target data contained in the data request and a corresponding relation between a preset prefix of the content name and the IP address of the first border gateway, converts the data request into a TCP/IP protocol format data request which takes the IP address of the first border gateway as a source IP address and the IP address of the target first border gateway as a target IP address, and sends the TCP/IP protocol format data request to a TCP/IP backbone network; the TCP/IP backbone network receives a data request in a TCP/IP protocol format sent by the source first border gateway, sends the data request to a destination first border gateway according to an IP address of the destination first border gateway contained in the data request, and the destination first border gateway receives the data request in the TCP/IP protocol format sent by the TCP/IP backbone network, obtains the IP address of the source first border gateway and the content name of the target data from the data request, stores the corresponding relation between the content name of the target data and the IP address of the source first border gateway, converts the data request into a data request in an ICN protocol format, and sends the data request to a destination edge ICN network in communication connection with the data request; the destination edge ICN network receives a data request in an ICN protocol format sent by the destination first border gateway, obtains data content corresponding to the content name of the target data according to the data request, and returns a request result containing the content name of the target data and the data content to the destination first border gateway in the ICN protocol format; the destination first border gateway further receives an ICN protocol format request result returned by the destination edge ICN network, obtains a content name of the target data in the request result, obtains an IP address of the source first border gateway according to a correspondence between the stored content name of the target data and the IP address of the source first border gateway, converts the request result into a TCP/IP protocol format in which the IP address of the source first border gateway is a source IP address, and the IP address of the source first border gateway is a destination IP address, and returns the request result to the TCP/IP backbone network; the TCP/IP backbone network further receives a TCP/IP protocol format request result returned by the destination first boundary gateway, returns the request result to the source first boundary gateway according to the IP address of the source first boundary gateway contained in the request result, and the source first boundary gateway further receives the TCP/IP protocol format request result returned by the TCP/IP backbone network, converts the request result into an ICN protocol format request result and returns the ICN protocol format request result to the source edge ICN network in communication connection with the source first boundary gateway; the source edge ICN further receives a request result in an ICN protocol format returned by the first edge gateway in communication connection with the source edge ICN, and outputs data content in the request result to a user. Because the backbone network of the embodiment of the invention is still a TCP/IP network in the existing application, and only some ICN networks are deployed in the edge network, compared with the existing network architecture fusing the ICN and the TCP/IP network, the network architecture provided by the embodiment of the invention has much smaller change on the TCP/IP network architecture in the existing application, so that the TCP/IP network architecture in the existing application can be utilized to realize the fusion of the ICN network and the TCP/IP network in a larger scale. Furthermore, because the network architecture provided by the embodiment of the invention has smaller change to the TCP/IP network architecture in the existing application, the integration of the ICN network and the TCP/IP network can be better realized compared with the existing network architecture for integrating the ICN network and the TCP/IP network.

Of course, not all of the advantages described above need to be achieved at the same time in the practice of any one product or method of the invention.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic diagram of a network topology structure of a converged network for implementing the interworking between an ICN and a TCP/IP network according to an embodiment of the present invention;

FIG. 2a is a flow chart illustrating interaction between a source edge ICN network and a destination edge ICN network in the converged network shown in FIG. 1;

FIG. 2b is a schematic diagram illustrating an interaction principle of the embodiment shown in FIG. 2 a;

FIG. 3 is a diagram illustrating a structure in which an encoding of a content name is stored in an ENPT data structure;

FIG. 4a is a flowchart of the interaction between the source edge ICN network and the destination edge TCP/IP network of the converged network shown in FIG. 1;

FIG. 4b is a schematic diagram illustrating an interaction principle of the embodiment shown in FIG. 4 a;

FIG. 5a is a flow chart of the interaction between the source edge TCP/IP network and the destination edge ICN network of the converged network shown in FIG. 1;

fig. 5b is a schematic diagram of an interaction principle of the embodiment shown in fig. 5 a.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The method aims to solve the problem that in the prior art, an ICN is taken as a backbone network, and the fusion and intercommunication of the ICN and a TCP/IP network are difficult to realize on a large scale. The embodiment of the invention provides a fusion network for realizing the intercommunication of an ICN and a TCP/IP network.

Referring to fig. 1, the converged network includes: a TCP/IP backbone network, a plurality of edge ICN networks and a plurality of first border gateways; each edge ICN network is in communication connection with the TCP/IP backbone network through a first border gateway;

the TCP/IP backbone network may only include routers, and each edge network may include hosts and routers.

Referring to fig. 2a and fig. 2b, the interaction process between the source edge ICN network and the destination edge ICN network in the converged network is as follows:

s201: and the source edge ICN network in each edge ICN network generates an ICN protocol format data request containing the content name of the target data according to the user request and sends the ICN protocol format data request to a source first boundary gateway in communication connection with the source edge ICN network.

For example, in a specific embodiment, the data request in the form of an interest package containing the content name of the target data is generated according to the user request, for example, a data request in the form of an interest package may be: ccnx, global/Beijing/bupt/telecom/video/06, wherein the content name of the target data in the data request is as follows: ccnx, global Beijingbuttelecomm video 06.

S202: the source first boundary gateway receives an ICN protocol format data request sent by a source edge ICN network in communication connection with the source first boundary gateway; determining the IP address of a target first border gateway according to the prefix of the content name of the target data contained in the data request and the corresponding relation between the preset prefix of the content name and the IP address of the first border gateway;

in one embodiment, an electronic device may be set up in the converged network to be communicatively connected to a TCP/IP backbone network; the electronic device is used for distributing corresponding naming prefixes to each edge ICN network when the edge ICN network joins the converged network. Of course, a plurality of electronic devices may be set up to allocate a corresponding named prefix to each edge ICN network when it joins the converged network. The embodiment of the invention does not limit the number of the electronic devices.

In other embodiments, a new function may be added to a router or other device in the TCP/IP backbone network, so as to allocate a corresponding named prefix to each edge ICN network when it joins the converged network.

The edge ICN network sends the assigned named prefix and the IP address of the first border gateway to all the border gateways in the converged network. Each border gateway in the converged network, upon receiving the message sent by the edge ICN network, may store the received named prefix and the IP address of the first border gateway in its own centralized manager table in the form of a key-value pair. In this way, the method for determining the IP address of the destination first border gateway according to the prefix of the content name of the target data included in the data request by the source first border gateway may be: and inquiring a self centralized manager table, starting matching from the root node during matching, and determining the IP address of the first border gateway corresponding to the named prefix which is longest matched with the prefix of the content name of the data request as the IP address of the target first border gateway.

Specifically, in order to improve the query speed when querying the centralized manager table, a cct (componentcharacter trie) structure may be adopted to encode each part of the content name, which is specifically shown in table one. The codes may be organized in a tree structure and stored by using the data structure of enpt (encoded Name Prefix trie). Referring to fig. 3, each circle in the graph may be referred to as a node, a number on each arrow represents an encoding corresponding to a part of a content name, a number in each node represents a status code corresponding to the encoding, and the matching starts from the root node, wherein a node status code is used for marking a retrieval path when the node is retrieved from the root node. The state code can avoid coding conflicts of different levels. The storage table constructed by adopting the data structure has higher performance in the aspects of searching, increasing and deleting table items. Wherein, the complexity of the query time of the storage table is as follows: o (knlogm + klogM), the time complexity of adding or deleting entries is: o (Nlogm + klogM). Where k denotes an average value of the number of hierarchical levels included in each content name, N denotes the number of partial numbers of content names included in average in each hierarchical level, M denotes an average value of the number of partial numbers that can be split for each content name when the content name is encoded by CCT, M denotes an average value of the number of partial numbers that can be split for each content name when the encoded content name is stored by ENPT, and N denotes an average length of each content name.

Watch 1

Name of content	Encoding	Border gateway IP
			/global	/1	XXX.XXX.XXX.XXX
/global/Beijing	/1/1	XXX.XXX.XXX.XXX
			/global/Beijing/bupt	/1/1/1	XXX.XXX.XXX.XXX
/com/google	/2/4	XXX.XXX.XXX.XXX
			/com/google/maps	/2/4/3	XXX.XXX.XXX.XXX
/cn/google/maps	/3/4/3	XXX.XXX.XXX.XXX
			/cn/sina	/3/3	XXX.XXX.XXX.XXX

The following illustrates an example of determining the IP address of the destination first border gateway based on the prefix of the content name:

for example, the content name of the target data in the data request is: global Beijing butt telecom 06, disassembles the content name into a plurality of parts with the separator "/" as boundary, for example, disassembles into: ccnx:/global/Beijing/bupt/telecom/video/06, sequentially starting from a root node ccnx:/global, inquiring each part of the corresponding code and the state code to which the part belongs, and if the code cannot be inquired by a certain part or the state code corresponding to the inquired code does not accord with the requirement, indicating that the part fails to be matched, returning the table entry corresponding to the longest part which has completed matching. For example, if the match of the part of the telecom fails, the IP address of the border gateway corresponding to the ccnx:/global/Beijing/bupt is returned. After obtaining the IP address of the border gateway, the data request converted into the TCP/IP protocol format may be sent to the TCP/IP backbone network, for example, the request method may be in a GET form, and the converted data request into the TCP/IP protocol format may be: GET/ccnx:/global/Beijing/but/telecom/video/06/HTTP/1.1, wherein "HTTP/1.1" is the protocol version of TCP/IP.

The content stored in the centralized manager table is not frequently changed, and only when a certain edge network exits the converged network and the border gateway in the converged network receives the exit message of the edge network, the table entry corresponding to the edge network is deleted from the centralized manager table of the border gateway.

S203: and the source first border gateway converts the data request into a TCP/IP protocol format data request with the IP address of the first border gateway as a source IP address and the IP address of the destination first border gateway as a destination IP address, and sends the data request to a TCP/IP backbone network.

S204: the TCP/IP backbone network receives a data request in a TCP/IP protocol format sent by the source first border gateway; and sending the data request to the destination first border gateway according to the IP address of the destination first border gateway contained in the data request.

S205: the destination first border gateway receives a TCP/IP protocol format data request sent by the TCP/IP backbone network; obtaining the IP address of the source first border gateway and the content name of the target data from the data request; and storing the corresponding relation between the content name of the target data and the IP address of the source first boundary gateway.

When receiving a data request sent by a TCP/IP backbone network, the destination first border gateway stores the content name of target data and the IP address of the source first border gateway obtained from the data request in a temporary mapping table of the destination first border gateway in a key value pair form. The purpose of setting up the temporary mapping table at the first border gateway is to ensure the correct return of the request result.

In practical applications, the temporary mapping table may be similar to the centralized manager table, and may be encoded for each part of the content name using a CCT structure, and then stored in a tree structure using an ENPT data structure. Unlike the centralized manager table: for example, when a new data request is received, the entry corresponding to the data request that has been correctly returned as a result of the request in the temporary mapping table may be deleted, and the new data request is added to the temporary mapping table.

S206: the destination first border gateway converts the data request into a data request in an ICN protocol format; and sending the data request to a destination edge ICN network in communication connection with the data request.

S207: the destination edge ICN network receives an ICN protocol format data request sent by the destination first edge gateway; and obtaining the data content corresponding to the content name of the target data according to the data request.

S208: and the destination edge ICN network returns the content name containing the target data and the request result of the data content to the destination first border gateway in an ICN protocol format.

S209: the destination first border gateway further receives an ICN protocol format request result returned by the destination edge ICN network; and acquiring the content name of the target data in the request result, and acquiring the IP address of the source first border gateway according to the corresponding relation between the stored content name of the target data and the IP address of the source first border gateway.

In contrast to the source first border gateway determining the IP address of the destination first border gateway according to the prefix of the content name of the target data included in the data request, the method for the destination first border gateway to obtain the IP address of the source first border gateway may be: and inquiring a temporary mapping table of the gateway, starting matching from the root node during matching, and determining the IP address of the first border gateway corresponding to the completely matched name of the content name of the data request as the IP address of the source first border gateway. If the code is found not to be searched by a certain part of the content name in the searching process or the state code corresponding to the searched code does not accord with the requirement, the completely matched table item does not exist, and the table item corresponding to the longest part which is matched before is returned to the searching centralized manager table when the matching of the certain part of the content name fails. The difference is that the temporary mapping table is inquired, and when some part of the content names fail to be matched, a search failure prompt is returned.

S210: the destination first border gateway converts the request result into a TCP/IP protocol format which takes the IP address of the first border gateway as a source IP address and the IP address of the source first border gateway as a destination IP address; and returning the request result to the TCP/IP backbone network.

S211: the TCP/IP backbone network further receives a TCP/IP protocol format request result returned by the destination first border gateway; and returning the request result to the source first boundary gateway according to the IP address of the source first boundary gateway contained in the request result.

S212: the source first border gateway further receives a TCP/IP protocol format request result returned by the TCP/IP backbone network; and converting the request result into an ICN protocol format request result and returning the request result to the source edge ICN network which is in communication connection with the request result.

S213: the source edge ICN network further receives a request result in an ICN protocol format returned by the first edge gateway in communication connection with the source edge ICN network; and outputting the data content in the request result to the user.

In the source edge ICN network, the data content in the request result may be output to the user along the route according to the forwarding route of the data request recorded in the pit (pending Interest table) table. The method for outputting the data content in the request result to the user is not limited in the source edge ICN network, and the method for outputting the data content in the request result to the user in the source edge ICN network is within the protection scope of the invention as long as the method can be completed.

The embodiment of the invention provides a fusion network for realizing the intercommunication of an ICN and a TCP/IP network, and the network architecture of the fusion network is as follows: compared with the existing convergence network which takes the ICN network as the backbone network, the convergence network provided by the embodiment of the invention has much smaller change on the TCP/IP network architecture in the existing application, so that the convergence of the ICN network and the TCP/IP network can be realized in a larger scale by utilizing the TCP/IP network architecture in the existing application.

Optionally, as shown in fig. 1, the converged network may further include a plurality of TCP/IP edge networks and a plurality of second border gateways; each edge TCP/IP network is in communication connection with the TCP/IP backbone network through a second border gateway;

referring to fig. 4a and 4b, the interaction process between the source edge ICN network and the destination edge TCP/IP network in the converged network is as follows:

s401: and the source edge ICN network in each edge ICN network generates an ICN protocol format data request containing a Uniform Resource Locator (URL) of target data according to the user request and sends the ICN protocol format data request to a source first border gateway in communication connection with the source edge ICN network.

For example, the URL (Uniform Resource Locator) of the Resource requested by the user is http:// www.bupt.edu.cn/vedio1, and the interest package may be named as ccnx:// www/but/edu/cn/vedio 1, wherein the content name of the interest package is: cww bupt edu cn drive 1.

S402: the source first boundary gateway receives an ICN protocol format data request sent by an edge ICN network in communication connection with the source first boundary gateway; and determining the IP address of the destination server through domain name resolution according to the URL contained in the data request.

Specifically, the IP address of the destination server can be directly determined by domain name resolution according to the URL included in the data request, and thus, the address of the destination second border gateway is obtained without querying the manager mapping table.

S403: and the source first border gateway converts the data request into a TCP/IP protocol format data request which takes the IP address of the source first border gateway as a source IP address and the IP address of the destination server as a destination IP address, and sends the data request to the TCP/IP backbone network.

Specifically, when the source first border gateway receives the interest packet, the source first border gateway may obtain a URL from the interest packet, and may convert the URL into a format of an HTTP message in a TCP/IP protocol format: GET (GET tool)http://www/bupt/edu/cn/ vedio1/HTTP/1.1。

S404: the TCP/IP backbone network receives a data request in a TCP/IP protocol format sent by the source first border gateway; and determining the IP address of the destination second border gateway according to the IP address of the destination server contained in the data request, and sending the data request to the destination second border gateway.

S405: the destination second border gateway receives a TCP/IP protocol format data request sent by the TCP/IP backbone network; and sending the data request to a destination edge TCP/IP network in communication connection with the data request.

Since the destination edge network is a TCP/IP network and the data request in the TCP/IP network is forwarded, the data packet corresponding to the data request includes the source IP address and the destination IP address, there is no need to set up the temporary mapping table at the second border gateway.

S406: the destination edge TCP/IP network receives a TCP/IP protocol format data request sent by the destination second border gateway; and obtaining the data content corresponding to the URL from the destination server according to the data request.

S407: and the destination edge TCP/IP network returns the request result containing the URL and the data content to the destination second border gateway in a TCP/IP protocol format.

S408: the destination second border gateway further receives a TCP/IP protocol format request result returned by the destination edge TCP/IP network; and returning the request result to the TCP/IP backbone network.

S409: the TCP/IP backbone network further receives a TCP/IP protocol format request result returned by the destination second border gateway; and returning the request result to the source first boundary gateway according to the source IP address in the request result.

S410: the source first border gateway further receives a TCP/IP protocol format request result returned by the TCP/IP backbone network; and converting the request result into an ICN protocol format request result and returning the request result to the source edge ICN network which is in communication connection with the request result.

S411: the source edge ICN network further receives a request result in an ICN protocol format returned by the first edge gateway in communication connection with the source edge ICN network; and outputting the data content in the request result to the user.

Optionally, referring to fig. 5a and 5b, in the converged network, an interaction process between the source edge TCP/IP network and the destination edge ICN network is as follows:

s501: and the source edge TCP/IP network in each edge TCP/IP network generates a TCP/IP protocol format data request containing the content name of the target data according to the user request and sends the TCP/IP protocol format data request to a source second border gateway in communication connection with the source edge TCP/IP network.

S502: the source second border gateway receives a TCP/IP protocol format data request sent by an edge TCP/IP network in communication connection with the source second border gateway; and determining the IP address of the target first border gateway according to the prefix of the content name of the target data contained in the data request and the corresponding relation between the preset prefix of the content name and the IP address of the first border gateway.

S503: and the source second border gateway sends the TCP/IP protocol format data request which takes the IP address of the client sending the user request as the source IP address and takes the IP address of the first border gateway as the destination IP address to a TCP/IP backbone network.

In the embodiment of the present invention, since the client initiating the data request is in the edge TCP/IP network and the request result is in the edge ICN network, the format of the data request is the format of the HTTP message, but the URL field of the message needs to contain the content of the request. For example, the requested content name is: the generated data request is as follows: GET/ccnx:/global/Beijing/bupt/telecom/video/06/HTTP/1.1.

S504: the TCP/IP backbone network receives a data request in a TCP/IP protocol format sent by the source second border gateway; and sending the data request to the destination first border gateway according to the IP address of the destination first border gateway contained in the data request.

S505: the destination first border gateway receives a TCP/IP protocol format data request sent by the TCP/IP backbone network; obtaining the IP address of the client and the content name of the target data from the data request; and storing the corresponding relation between the content name of the target data and the IP address of the client.

S506: the destination first border gateway converts the data request into a data request in an ICN protocol format; and sending the data request to a destination edge ICN network in communication connection with the data request.

S507: the destination edge ICN network receives an ICN protocol format data request sent by the destination first edge gateway; and obtaining the data content corresponding to the content name of the target data according to the data request.

S508: and the destination edge ICN network returns the content name containing the target data and the request result of the data content to the destination first border gateway in an ICN protocol format.

S509: the destination first border gateway further receives an ICN protocol format request result returned by the destination edge ICN network; obtaining the content name of the target data in the request result, and obtaining the IP address of the source first border gateway according to the corresponding relation between the stored content name of the target data and the IP address of the client;

s510: the destination first border gateway converts the request result into a TCP/IP protocol format which takes the IP address of the first border gateway as a source IP address and the IP address of the client as a destination IP address; and returning the request result to the TCP/IP backbone network.

Specifically, since the client initiating the data request is in the edge TCP/IP network in this embodiment, the content name of the target data in the data request and the IP address of the corresponding client are stored in the temporary mapping table of the destination first border gateway.

S511: the TCP/IP backbone network further receives a TCP/IP protocol format request result returned by the destination first border gateway; determining the IP address of the source second border gateway according to the IP address of the client contained in the request result; and returning the request result to the source second border gateway.

S512: the source second border gateway further receives a TCP/IP protocol format request result returned by the TCP/IP backbone network; and returning the request result to a source edge TCP/IP network in communication connection with the request result according to the IP address of the client side contained in the request result.

S513: the source edge TCP/IP network further receives a request result in a TCP/IP protocol format returned by a second border gateway in communication connection with the source edge TCP/IP network; and outputting the data content in the request result to a user according to the IP address of the client.

Of course, the converged network may also include interaction between the source edge TCP/IP network and the destination edge TCP/IP network. The interaction process between the edge TCP/IP network and the destination edge TCP/IP network in the embodiment of the present invention is similar to the interaction process between the edge TCP/IP network and the destination edge TCP/IP network in the TCP/IP network architecture in the existing application, and is not described herein again. Under the network architecture provided by the embodiment of the invention, as long as the method for realizing the interaction between the edge TCP/IP network and the edge TCP/IP network through the backbone TCP/IP network can be completed, the method falls into the protection scope of the embodiment of the invention.

In addition, in the converged network for realizing the interworking between the ICN and the TCP/IP network provided in the embodiment of the present invention, a temporary mapping table is set in the first border gateway to store a mapping relationship between a content name of target data and an IP address of the first border gateway corresponding to a source or between a content name of target data and an IP address of a corresponding client, so that a request result of a data request initiated by a client in the edge ICN network is ensured, and the request result can be correctly returned. And setting a centralized management mapping table between the first border gateway and the second border gateway, which is used for storing the mapping relation between the network prefix of the edge ICN network and the IP address of the corresponding first border gateway, thereby ensuring that the target edge network can be found correctly and quickly according to the content name in the data request.

The embodiment of the invention also provides a communication method applied to the converged network, which comprises the following steps:

Optionally, the method further includes:

Optionally, in an embodiment, the converged network further includes an electronic device, which is in communication connection with the TCP/IP backbone network. When each edge ICN network joins the converged network, a first border gateway with a communication connection with the edge ICN network joins the converged network, and the first border gateway establishes a communication connection with the converged network. And the electronic equipment allocates corresponding named prefixes to each edge ICN network when the edge ICN network joins the converged network.

And the edge ICN network sends the assigned named prefix and the IP address of the first border gateway of the edge ICN network to all the first border gateways and all the second border gateways in the converged network. And each first border gateway and each second border gateway in the network receive the message sent by the edge ICN network and store the received naming prefix and the IP address of the first border gateway in a centralized manager table of the first border gateway in a key-value pair mode. In this way, the step of determining, by the source first border gateway or the source second border gateway, the IP address of the destination first border gateway according to the prefix of the content name of the target data included in the data request may be:

inquiring a centralized manager table of the data request according to the prefix of the content name of the target data contained in the data request; and determining the IP address of the first border gateway corresponding to the named prefix which is longest matched with the prefix of the content name of the data request as the IP address of the target first border gateway.

Optionally, the step of storing the correspondence between the content name of the target data and the IP address by the destination first border gateway may be:

The communication method applied to the converged network provided by the embodiment of the invention can realize interaction among all edge networks in the converged network.

In addition, the embodiment of the present invention provides a communication method applied to the above converged network, where a temporary mapping table is set in the first border gateway, and is used to store a mapping relationship between a content name of target data and an IP address of the corresponding source first border gateway or between a content name of target data and an IP address of a corresponding client, so as to ensure a request result of a data request initiated by a client in the edge ICN network, and enable the request result to be returned correctly. And setting a centralized management mapping table between the first border gateway and the second border gateway, which is used for storing the mapping relation between the network prefix of the edge ICN network and the IP address of the corresponding first border gateway, thereby ensuring that the target edge network can be found correctly and quickly according to the content name in the data request.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

All the embodiments in the present specification are described in a related manner, and the same and similar parts among the embodiments may be referred to each other, and each embodiment focuses on the differences from the other embodiments. Especially, as for the method embodiment, since it is basically similar to the network embodiment, the description is simple, and the relevant points can be referred to the partial description of the network embodiment.

The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.

Claims

1. A converged network system for realizing ICN and TCP/IP network intercommunication is characterized by comprising: a TCP/IP backbone network, a plurality of edge ICN networks and a plurality of first border gateways; each edge ICN network is in communication connection with the TCP/IP backbone network through a first border gateway;

2. The converged network system of claim 1, further comprising a plurality of TCP/IP edge networks and a plurality of second border gateways; each edge TCP/IP network is in communication connection with the TCP/IP backbone network through a second border gateway;

3. The converged network system of claim 2,

4. The converged network system of claim 3, further comprising an electronic device communicatively coupled to the TCP/IP backbone network;

when each edge ICN network joins the converged network system, a first border gateway with communication connection with the edge ICN network joins the converged network system, and communication connection is established with the converged network system through the first border gateway;

when each edge ICN network joins the converged network system, the electronic equipment allocates a corresponding named prefix to the edge ICN network;

the edge ICN network sends the assigned named prefix and the IP address of the first border gateway of the edge ICN network to all the first border gateways and all the second border gateways in the converged network system;

each first border gateway and each second border gateway in the converged network system receive the message sent by the edge ICN network, and store the received naming prefix and the IP address of the first border gateway in a centralized manager table of the first border gateway in a key value pair mode;

5. The converged network system of claim 3,

when receiving a data request sent by the TCP/IP backbone network, the destination first border gateway stores the content name of target data and the IP address of the source first border gateway obtained from the data request in a temporary mapping table of the destination first border gateway in a key value pair form;

6. A communication method applied to the converged network system of claim 1, comprising:

7. The communication method according to claim 6, wherein the converged network system further comprises: a plurality of edge TCP/IP networks and a plurality of second border gateways; each edge TCP/IP network establishes communication connection with the TCP/IP backbone network through a second border gateway;

8. The communication method according to claim 7, further comprising:

9. The communication method according to claim 8, wherein the converged network system further comprises an electronic device communicatively coupled to the TCP/IP backbone network;

10. The communication method according to claim 8,

the step of storing the corresponding relationship between the content name and the IP address of the target data, by the destination first border gateway, includes: