KR101486657B1 - Method and system for providing handover in network based contents - Google Patents

Abstract

The present invention relates to a method for providing a handover in a content centric network which includes: a step of periodically transmitting a predetermined message which has a prefix to each of at least one client node included within a content centric network (CCN) at a first CCN node; a step of detecting a movement of the client node through the prefix information within the predetermined message received from the first CCN node at a client node which requests a name of content to a CCN router which is connected to itself; a step of transmitting its own location information by transmitting a prefix upadte message to the first CCN node of the previous domain when the client node detects the movement of the client node to a second CCN node; and a step of forming an extended local route by exchanging a handover operation message with the first and second CCN nodes which correspond to a moving route at the client when the client node moves to a third CCN node.

Description

[0001] METHOD AND SYSTEM FOR PROVIDING HANDOVER IN NETWORK BASED CONTENTS [0002]

The present invention relates to providing handover in a content-based network.

In the current Internet architecture based on IP address, both ends participating in communication follow a one-to-one transmission structure in which an IP data packet is transmitted through a single path after establishing a mutual connection relationship. Thus, scalability, security, and mobility And it exposes many problems from the side.

In order to solve this problem, a content centric networking (CCN) model, which is a new networking concept in which a content name is used as an identifier instead of an IP address, has been proposed.

In other words, the CCN changes the current Internet communication structure that focuses on "where" such as address, server, host, etc. to "what", ie, information itself. To this end, a variety of similar technologies are currently being studied, mainly in North America and Europe.
In this regard, although the patent publication No. 10-2013-0088382 (Aug. 08, 2008) discloses a method concerning a content sharing network,
The current CCN model based on content sharing network adopting this method does not provide a sufficient mechanism to support the mobility of the server.

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As a result, the explosion of smart personalized devices, which are represented by smartphones, exposes the limitation of ensuring smooth support for mobile personal servers, which are expected to increase explosively in the future.

Accordingly, the present invention proposes a technique for providing handover in a content-based network for a high-speed secure mobility scheme to support the mobility of a mobile server and to minimize a packet loss problem due to handover delay do.

According to an aspect of the present invention, there is provided a method for transmitting a message including at least one client node periodically transmitting a predefined message including a prefix at a first CCN (Content Centric Network) node, Detecting whether the client node is moving through a predetermined message prefix information received from the first CCN node at a client node requesting a CCN router connected to the CCN router; Transmitting a prefix update message to a first CCN node of a domain before moving to transmit its own location information; and when the client node moves to a third CCN node, And a process of forming an extended local path through a handover execution message exchange with the second CCN node It characterized in that it comprises.

According to another aspect of the present invention, there is provided a method of transmitting a message including a predetermined message including a prefix periodically to at least one or more client nodes included in a CCN, And a client node requesting a content name from a CCN router connected to the CCN router, wherein the client node receives the content received from the first CCN node Detects a move to the second CCN node through the prefix information in the predetermined message, transmits a prefix update message to the first CCN node of the domain before the movement to transmit its own location information, and transmits the third CCN Node, the handover execution message exchange with the first and second CCN nodes corresponding to the movement route is performed It is characterized in that forming an extended local (local) routes.

The present invention rapidly supports the mobility of a mobile contents source (MCS) in a CCN environment, thereby minimizing packet loss and service disconnection during handover, thereby improving service performance and network performance.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an overall flowchart of a method for providing handover in a content-based network according to an embodiment of the present invention; FIG.
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a handover providing system in a content-based network.
3 is a detailed view of a handover providing system in a content-based network according to an embodiment of the present invention;
4 is a routing table corresponding to a handover execution message in a handover providing system in a content-based network according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. It will be appreciated that those skilled in the art will readily observe that certain changes in form and detail may be made therein without departing from the spirit and scope of the present invention as defined by the appended claims. To those of ordinary skill in the art.

The present invention relates to providing a handover in a content-based network, and more particularly, to a method and apparatus for providing handover in a content-based network, more specifically, by enclosing and transmitting prefix information of a CCN domain in a wireless initialization information periodically transmitted from a CCN node, The prefix update message is transmitted to the first CCN node of the pre-movement domain, and the location information of the client node is transmitted to the neighbor node, - a location updating step for re-forwarding the CCN node to the neighboring domain; when the client node moves to another neighboring domain, it exchanges a handover execution message with the CCN node corresponding to the movement route, The local path to the to form an extended path Path expansion phase; And performing a Duplicate name detection (DND) for transmitting the tentative prefix to the current CCN node during the path expansion step and confirming the uniqueness with a unique tentative prefix in the domain when there is no response, We propose a technology to improve service performance and network performance by minimizing packet loss and service disconnection during handover by supporting mobility of content source (MCS) rapidly.

Hereinafter, a method of providing a handover in a content-based network according to an embodiment of the present invention will be described in detail with reference to FIGS. 1, 3, and 4. FIG.

1 is an overall flowchart of a handover providing method in a content-based network according to an embodiment of the present invention.

Referring to FIG. 1, in step 110, the first CCN node periodically transmits a predefined message including a prefix for each of at least one client node included in the CCN.

3, a system in a content-based network according to the present invention includes various CCN nodes (CR _H , CR 1, CR 2, CR 3, CR 4, CR 5) for transmitting contents, As shown in FIG. 3, when performing a handover between a CCN node and a client node in a reactive mode, a handover indication (HI) and hand A Handover Indication Acknowledgment (HIack) message is exchanged between the client node and the CCN node of the previous domain.

In step 112, the client node detects whether the client node is moving through the prefix information in the predetermined message received from the first CCN node.

In other words, assuming that the prefix information of the domain for the CCN node to which the corresponding CCN node belongs is transmitted in a signal periodically transmitted from the CCN node, the client node checks periodically received wireless initial information and domain prefix information in the information, Can be detected.

In step 114, if the movement is detected in step 114, if the client detects movement to a node other than the CCN node, that is, to the second CCN node, the process moves to step 116 and transmits a prefix update message to the first CCN And transmits its own location information to the node.

That is, the client node that detects the movement by the initialization information from the CCN node first performs an operation for updating its current location information in the content router (CR _H ) in its original domain.

The client node transmits a prefix update message to the first CCN node and transmits an interest message to the first CCN node before the second CCN node, And re-forwarding the packet to its location.

In other words, the client node interest packet that should be passed to it are processed as the current position by passing the 'prefix update (PU)' message to CR _H - allows forwarding.

The PU message includes MCS signature information for determining whether the sender is a mobile content source (MCS).

This allows message authentication. The CR _H transmits a 'PU Acknowledgment (PUack)' message in response to the PU to indicate whether the location information update process is successful. This allows the MSC to continue to participate in the content delivery process.

In step 118, when the client node moves to a third CCN node, the client node performs a handover message exchange with the first and second CCN nodes corresponding to the movement route, and in step 120, To form an extended local path.

The operation of step 118 is to minimize the handover processing delay by extending the path in the neighboring area before updating the location to the CR _H. The client node temporarily moves from the previous CR (pCR) to the current CR (nCR) Minimize the handover delay through the local path and the extended path.

Here, the client node transmits whether its uniqueness to the tentative prefix acquired from the third CCN node is a tentative prefix of its CCN node domain, checks whether a response is generated for a predetermined time, and if no response is generated Through a Duplicate name detection (DND) mechanism for authenticating the tentative prefix.

As shown in FIG. 4, the routing table information of the HI message includes information on the routing table information as shown in FIG. 4 (a) A prefix state field 41 indicating prefix information, a CCN outgoing face field 42 indicating face information of the CCN, a lifetime field 43 indicating an expiration time or expiration time, And a flag field 44 indicating a flag of the overindex message.

The HIAck message includes a prefix status field 45 indicating prefix information, a CCN outgoing face field 46 indicating face information of the CCN, A lifetime field 47 indicating a time or an expiration time, and a flag field 48 indicating a flag of a handover indication message.

In the foregoing, a handover providing method in a content-based network according to an embodiment of the present invention has been described.

Hereinafter, a handover providing system in a content-based network according to an embodiment of the present invention will be described with reference to FIG.

Referring to FIG. 2, a system 200 to which the present invention is applied includes a CCN content providing node 20, a content providing node 20, A CCN router 22, and at least one or more client nodes 24, 25.

The CCN (Content Centric Network) node 20 periodically transmits a predefined message including a prefix for each of at least one or more client nodes included in the CCN. The CCN node exists in correspondence with a network including a plurality of routers and client nodes connected to the router, and is allocated to a specific domain to control overall services performed in the network.

The CCN router 22 caches content around the CCN node 20 and provides the content to client nodes 24 and 25 requesting the content.

The client node (24, 25) requests the CCN router connected to the content name, detects the movement through the prefix information in the predetermined message received from the first CCN node, and detects the movement to the second CCN node In this case, the prefix update message is transmitted to the first CCN node of the domain before the movement to transfer its own location information. If the prefix update message is moved to the third CCN node, the handover to the first and second CCN nodes And forms an extended local path through overexecution message exchange.

When forming the extended local path in the client node (24, 25), whether the tentative prefix obtained at the third CCN node is uniquely transmitted is transmitted to the corresponding CCN node domain by transmitting its tentative prefix to the corresponding CCN node domain, (DND) mechanism for authenticating the tentative prefix when a response is not generated by checking whether the tentative prefix is authenticated.

The routing table information of the HI message includes a prefix state field indicating the prefix information, a face information of the CCN, A lifetime field indicating a valid time or an expiration time, and a flag field indicating a flag of a handover indication message.

The HIAck message includes a prefix state field indicating prefix information, a CCN outgoing face field indicating face information of the CCN, a lifetime field indicating a valid time or an expiration time, And a flag field indicating a flag of the flag.

Then, the client node (24, 25) transmits the prefix update message to the first CCN node to re-forward the interest packet at the first CCN node before the second CCN node to its own location (re-forwarding) its own location information.

As described above, the method and system for providing handover in a content-based network according to the present invention can be performed. While the present invention has been described with reference to the exemplary embodiments, it is to be understood that the invention is not limited thereto . Accordingly, the scope of the present invention should not be limited by the illustrated embodiments, but should be determined by equivalents of the claims and the claims.

20: CCN content providing node 22: CCN router
24, 25: Client node

Claims (10)

Transmitting a predefined message including a prefix at a first CCN (Content Centric Network) node periodically to at least one or more client nodes included in the CCN;
Detecting whether a client node requesting a content name from a CCN router connected to the CCN router through prefix information in a predetermined message received from the first CCN node,
Transmitting a prefix update message to a first CCN node in a pre-movement domain and transmitting its location information when the client node detects movement to a second CCN node;
When the client node moves to the third CCN node, forming an extended local path through a handover execution message exchange with the first and second CCN nodes corresponding to the movement route in the client node And transmitting the handover request message to the content-based network (CCN). The method according to claim 1,
Wherein the step of forming the extended local path comprises:
The client node transmits the tentative prefix acquired at the third CCN node to the corresponding CCN node domain by checking whether the tentative prefix is unique or not, (DND) mechanism for authenticating the tentative prefix, if it is determined that the tentative prefix is not valid. The method according to claim 1,
The handover execution message includes:
A handover indication (HI) message, and an acknowledgment (HIAck) message. The method according to claim 1,
The process of transmitting the location information of the client node includes:
The client node transmits a prefix update message to the first CCN node and re-forwarding an interest packet at the first CCN node before the second CCN node to its location Wherein the handover is performed in a content-based network. 5. The method of claim 4,
Wherein the prefix update message includes signature information of a client node for determining whether the sender is a corresponding client node, and message authentication is performed through the signature information. A Content Centric Network (CCN) node for periodically transmitting a predefined message including a prefix for each of at least one client node included in the CCN,
A plurality of CCN routers for caching content around the CCN node and providing the content to a requesting client node;
A client node requesting a content name to a CCN router associated with the content node,
The client node comprising:
When detecting movement through the prefix information in the pre-established message received from the first CCN node and detecting movement to the second CCN node, transmits a prefix update message to the first CCN node in the pre-movement domain, Lt; / RTI >
Wherein when the mobile node moves to the third CCN node, it creates an extended local path through a handover execution message exchange with the first and second CCN nodes corresponding to the movement route, Centric Network (CCN). 7. The method of claim 6, wherein upon forming the extended local path at the client node,
Whether or not a tentative prefix obtained at a third CCN node is uniquely transmitted is transmitted to a corresponding CCN node domain by checking whether a response has been generated for a predetermined time, And a Duplicate name detection (DND) mechanism for authenticating the tentative prefix. 7. The method of claim 6,
A handover indication (HI) message, and a HIAck (acknowledgment) message. 9. The method of claim 8,
The routing table information of the HI message includes,
A prefix state field indicating prefix information,
A CCN outgoing face field indicating face information of the CCN,
A lifetime field indicating an expiration time or an expiration time,
And a flag field indicating a flag of a handover indication message. The method according to claim 6,
The client node comprising:
Forwarding the prefix update message to the first CCN node and re-forwarding the interest packet at the first CCN node before the second CCN node to its own location, Wherein the handover providing system transmits the handover request to the content-based network.

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