180 results about "Content centric networking" patented technology

One embodiment of the present invention provides a system for facilitating communication in a content centric network (CCN). During operation, the system receives at a first node from an interest owner an interest in a piece of content. The interest indicates a structured name for the content. Furthermore, the name is unique and persistent with respect to the content, and where the name includes authentication information for the content. Next, the system determines whether content available at the first node satisfies the interest. If so, the system sends the content to the interest owner. Otherwise, the system marks the interest as pending, and forwards the interest to a second node in the network based on the interest. After receiving content from the second node in response to the forwarded interest, the system un-marks the interest as pending and sends the content to the interest owner.

One embodiment provides a system that facilitates forwarding a packet. During operation, the system receives a packet with a hierarchically structured variable-length identifier (HSVLI). The system then performs a lookup at a forwarding engine based at least on the packets HSVLI. The system further makes a forwarding decision based on the lookup.

One embodiment of the present invention provides a system for facilitating session migration. During operation, the system receives a communication packet from a client destined to a remote server. The system determines whether the communication packet belongs to a pre-existing communication session, and whether session state information associated with the session is available locally. In response to the communication packet belonging to a pre-existing communication session and the session state information being unavailable locally, the system constructs an interest requesting the session state information, disseminates the interest over a network, and receives the session state information.

One embodiment of the present invention provides a system for facilitating custodian-based routing. During operation, the system receives, at a computing device, a request for a piece of content from a user, and determines whether the content is available locally. In response to the content not being available locally, the system identifies a remote custodian device that stores the content. The custodian device is not identified by its physical address. The system then identifies a communication endpoint associated with the identified custodian device, and maps a physical address corresponding to the identified communication endpoint. The system establishes a connection to the communication endpoint using the mapped physical address to obtain the requested content.

Disclosed is a centralized controlling method of the process of delivering a routing packet for content transmission in a content-centric network (CCN). The routing method in a content centric network according to the present invention includes: a content distribution controller in the content centric network receiving a request for specific-content distribution from a user, determining locations of routers storing the content, and finding one of the routers to which the request from the user will be transmitted; and the content distribution controller finding an optimal path in consideration of a traffic distribution status and then transmitting a forwarding information base (FIB) to routers included in the optimal path.

A device can process commands from a remote device that manages the local device over a content centric network. During operation, the device can receive an Interest for managing a device resource, such that the Interest's name includes a name or a name prefix associated with the device resource, and includes a command for managing the resource. If the device determines that the name prefix corresponds to the local device, the device analyzes the Interest's command to determine a device resource and performs the resource-managing operation on the device resource. If the name prefix does not correspond to the local device, the device performs a longest-prefix-matching lookup using the Interest's name prefix to determine a destination for the Interest. If the Interest's destination corresponds to a component of the local device, the device forwards the Interest to the component or a local agent for the component.

One embodiment provides a system that facilitates redistribution of content objects with a different name without requiring re-computation of the original authentication information. During operation, the system determines, by a content producing device, an original manifest which indicates at least an original name associated with a content object, wherein the name is a hierarchically structured variable length identifier (HSVLI) which comprises contiguous name components ordered from a most general level to a most specific level. The system renames the content object with a new name. The system also creates a new manifest which indicates the new name, wherein the new manifest includes original authentication information associated with the original manifest.

One embodiment provides a system that facilitates routers in verifying content objects in a cost-effective manner by aggregating content objects into a secure content catalog. During operation, a client computing device receives a secure content catalog, which indicates a set of content objects and their corresponding digests. The catalog is digitally signed with the private key of a producer of the catalog. The client computing device constructs an interest for a content object, where the interest indicates a name for the content object and the corresponding digest for the content object, which is based on the secure content catalog. The name for the request content object is a hierarchically structured variable length identifier (HSVLI) which comprises name components ordered from a most general level to a most specific level.

The invention discloses a content-centric networking multi-interest packet compression sending and processing method. The method comprises that compression interest packets are added, a content name part of each of the compression interest packets is divided into common prefixes of various interest content names and suffixes of the various interest content names, multiple interest packets which have a common prefix are compressed to be compression interest packet request data, when a network node receives the compression interest packets, the common interest prefix and the interest suffix are sliced to be an integrated content name, searching is carried out in content caching, a undetermined interest table and forwarding information table, forwarding interfaces are determined, for each interface, the common prefixes of the content names in all the interests to be sent are extracted, and the common prefixes and the surplus suffixes of the content names are combined to form a compressed interest packet which is sent.. The method effectively reduces the number of the interest packets in the network, and consumption of bandwidth is reduced, the compression problem of the multiple interest packets which have the same name prefix in the content center network is solved, and the content-centric networking multi-interest packet compression sending and processing method has stronger popularization and application value.

There is provided a content centric networking system providing a differentiated service that includes a client device that creates an interest packet, an edge router directly connected to the client device in the content centric networking system, that determines a traffic class for an interest packet on the basis of the information included in an interest packet received from the client device, and marks the determined traffic class information in association with the interest packet; and a differentiated service router, which when receiving the interest packet added with the traffic class information, stores the traffic class information in a pending interest table (PIT) and differentially transmits the data requested by the interest packet in accordance with the traffic class information.

The invention discloses a multi-layer encryption privacy protection method used for content-centric networking. The multi-layer encryption privacy protection method comprises the steps that: a requester sends an interest package used for creditability validation to a publisher of content, and the publisher responds to the requestor; the requestor sequentially uses a publisher public key and a router public key for encrypting the requested interest packet, and sends the requested interest packet to a router; the router decrypts the requested interest packet by using a private key to obtain information it needs, and then forwards the requested interest packet to the next-layer router until the requested interest packet is sent to the publisher; the publisher decrypts the requested interest packet by using a publisher private key, validates the creditability of the requester, responds to the requested interest packet when the validation passes, and sends data to the router; and the router decrypts a data packet by using a private key to obtain response data, and forwards the response data to the next-level router until the response data is forwarded to the requester. The multi-layer encryption privacy protection method adopts the public keys for encryption, is relatively high in security, and can protect the privacy of the requestor and the publisher to a greater extent.

The invention relates to a content classification based category popularity cache replacement method in an oriented content-centric networking. The content classification based category popularity cache replacement method comprises the following steps: firstly determining whether a remaining cache space of a node can accommodate new data content or not; caching the new data content if the cache space is enough; calculating the popularity of all content categories in standard computing nodes according to an exponentially weighted moving average method, and selecting the content category with the smallest popularity; removing a content item with the fewest request times in predefined time in the content category with the smallest popularity out of a node cache; extracting name character string characteristics of the new data content and classifying; storing the newly arrived data content item into corresponding content category in the node, and updating a category heat table and a log. The cache of nodes in CCN (content-centric networking) can be better managed according to the content name category, so that the content can be found and replaced from the name of the content in the communication process in the networking, the diversity of the content in the node cache is balanced, and the efficiency of cache replacement is improved.

One embodiment of the present invention provides a system including a mobile device and a content-retrieving agent for facilitating energy-efficient content retrieval. During operation, the mobile device receives a request for a piece of content from a user. In response to the request, the mobile device forwards the request to the content-retrieving agent which is configured to obtain the requested content from a remote device on behalf of the mobile device. The system allows the mobile device's receiver to be placed in an energy-saving sleep mode when the content-retrieving agent is obtaining the requested content for the mobile device and is not transmitting the content to the mobile device. The system allows the mobile device's receiver to wake up when the content-retrieving agent is transmitting the content to the mobile device. The mobile device receives the content from the content-retrieving agent.

One embodiment of the present invention provides a system for facilitating custodian-based routing. During operation, the system receives, at a computing device serving as a backup custodian to one or more mobile devices, a request for a piece of content from a requesting device, which has mapped the content to the computing device based on the content's name without using the computing device's physical address. The system determines whether the content is available on the computing device. In response to the content not being available on the computing device, the system identifies a mobile device that stores the content, and obtains the content from the identified mobile device. The system then caches the content on the computing device, thereby enabling the computing device to provide the content in response to subsequent requests without connecting to the identified mobile device, and provides the content to the requesting device.

The present invention discloses a content routing system of a network layer based on an SDN technology and a CCN frame and a working mode thereof. The system is characterized by comprising a protocol oblivious forwarding (POF) controller and n content routers, wherein the POF controller comprises a link discovery module and a topology management module, and the content routers are used for operating a POFSwitch forwarding process and a POF-CCN routing process. According to the present invention, a hard coupling relationship of the content names and the positions thereof is removed in the system network layer, thereby being able to directly route to the content sources according to the content names, and realizing a content obtaining function of the network layer.

One embodiment of the present invention provides a system for correctly processing an interest in a content-centric network (CCN). During operation, a first node in the CCN receives an interest for a piece of content from a second node. The interest indicates a name of the piece of content and a hop count from the second node to a destination node advertising the piece of content. The system determines, based on forwarding information and information associated with pending interests stored on the first node, whether a distance-based forwarding condition is met; and in response to the distance-based forwarding condition being met, accepts the interest.

The invention discloses a distributed mobile data transmission method for CCN (Content-Centric Networking). The method includes the following steps: 1) when moving from an access router AR1 to the overlapping area of the AR1 and a router AR2, a receiver sends a message HI containing the identification information of the AR2 to the AR1; 2) when receiving the HI, the AR1 searches the content name corresponding to the receiver in a request table PIT (Pending Interest Table), builds a signaling message by using the content name and the identification of the AR2, and deletes the corresponding PIT entry; 3) the AR1 sends the signaling message along a reverse path corresponding to the content name, and identifies a branch node; the branch node directs the corresponding entry in the PIT to the AR2 and continues to forward the signaling message, and a subsequent router builds a PIT entry corresponding to the content name and directs a next-hop interface to the AR2; 4) an intermediate router between the branch node and the AR2 builds a PIT entry corresponding to the content name. The invention avoids handoff delay and enormous network expenses.

A method for managing packets over interfaces of a Content Centric Networking node, the method comprising the following steps

• receiving over an interface of the node at least a request for a data packet;
• if the data packet is stored by the node, forwarding the data packet over the interface of the received request;
• otherwise
• performing an exploration step, by
• selecting randomly at least an interface towards a neighboring node;
• forwarding the request over the selected interface;
• receiving in response over the randomly selected interface, the data packet with associated minimum time delivery value estimated by the neighboring node;
  • identifying an interface providing the minimum data packet delivery time value based on exploration step results.

One embodiment provides a system that deletes cached content. During operation, the system generates, by a content producing device, a content object packet that includes a name for the content object and a deletion identifier that is used to verify a subsequent deletion command. The system receives a notification message that includes a routable prefix for a router and indicates that the router has cached the content object packet. The system stores in a data structure a mapping between the routable prefix, the name, and a previously generated deletion token which is used as a pre-image of the deletion identifier. In response to determining a condition to delete the cached content object packet, the system transmits a deletion command based on the routable prefix, wherein the deletion command includes the deletion token and the name for the cached copy of the content object packet to be deleted.

The invention discloses a content-centric networking cache judgment method based on node importance degrees. According to the method, importance degrees of nodes on return paths are considered, reasonable distribution of network cache resources is further improved, and the cache hit rate is increased, so that performances of a content-centric networking are improved on the whole. The method is applicable to deployment of the content-centric networking.

The invention is applicable to the technical field of computers, and provides a caching method and device for content centric networking (CCN). The method comprises the following steps: according to a preset node centricity calculation formula, generating the node centricity of each node in the CCN; according to the centricities of all the nodes, selecting a part of the nodes; calculating the number of collaborative neighbor nodes corresponding to each node in the part of the nodes, and acquiring the collaborative neighbor nodes corresponding to each node in the part of the nodes according to the number of the collaborative neighbor nodes; and when one of the collaborative neighbor nodes receives data to be cached, determining a caching node corresponding to the data among the collaborative neighbor nodes, and caching the data in the caching node. The method and device provided by the invention has the advantages that the redundancy of cached contents in the CCN is effectively reduced, the variety of the cached contents is improved, and expenses for collaborative communication among the nodes in the CCN are effectively reduced.

The invention relates to a content centric networking edge node potential enhanced routing method and belongs to the field of the Internet. For the problem that the routing efficiency is low due to the fact that a content centric networking cannot sense cache content, the ENPER (Edge Node Potential-enhanced Routing) based on potential is provided. A potential model of nodes is established and through enhancement of the potential of edge nodes, interest packets are attracted to nearby cache nodes for response, so the forwarding time of the interest packets is reduced and a cache hit rate is improved. According to the ENPER, statistics and prediction are carried out on the popularity of content through the edge nodes, and through combination of a size of the networking, potential notification ranges of the content with different popularity are distinguished, thereby reducing the network overhead. According to the method, the load and cache notification overhead of an issuer server are effectively reduced, and compared with Best-routing, the ENPER has the advantage that the average request time delay of the content is reduced by 43%.