Exchange method and exchange node of metadata in opportunity network

A technology for exchanging nodes and metadata, applied in the field of information, can solve the problems that the synchronization of node metadata is not ideal, and nodes cannot provide valid data to each other, and achieve the effect of improving synchronization

Active Publication Date: 2012-11-21
TONGJI UNIV
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Problems solved by technology

However, in Jyh-How Huang's method, in the case of limited cache, the synchronization of node

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  • Exchange method and exchange node of metadata in opportunity network
  • Exchange method and exchange node of metadata in opportunity network
  • Exchange method and exchange node of metadata in opportunity network

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Embodiment Construction

[0047] The present invention will be further described in detail below in conjunction with the drawings. In order to better describe the technical solutions of the embodiments of the present invention, first, the following concepts are explained one by one. Those skilled in the art will know that the explanation is only to help understanding and explanation, and is not meant to limit the present invention. The term part is commonly used in the art or can be understood by those of ordinary skill in the art, and does not constitute a limitation of the embodiments of the present invention.

[0048] The metadata exchange method based on dynamic signature vector involves summary vector (Summary Vector, SV), request vector (Request Vector, RV) and signature vector (Known Vector, KV). The formal definitions and corresponding metadata are introduced below. Exchange method.

[0049] The summary vector SV sent by node A to node B A→B for:

[0050] SV A→B ={(id m , T m )|m∈BUF A , B∈KV m, A ...

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Abstract

An embodiment of the invention discloses an exchange method and an exchange node of metadata in an opportunity network. The exchange method and the exchange node are used for the technical field of information to provide an improvement mode of dynamic signature vector aiming at resolving the problem in the prior art that solutions of metadata exchange in the opportunity network are insufficient, and especially a signature vector method has shortcomings. A node A generates a new vector element when the node A receives news transmitted by a node B, and the new vector element is survival time of two-tuples that information transmitted to the node B from the node A corresponds to. The node A adds the two-tuples into the dynamic signature vector that the information corresponds to. If the dynamic signature vector contains the two-tuples, two-tuples that larger ones in the sum correspond to are added in to update the dynamic signature vector that the information corresponds to. The exchange method and the exchange node add overtime processing and node elimination prediction mechanisms on the basis of the prior signature vector and improve synchronism of metadata between the nodes.

Description

Technical field [0001] The present invention relates to a field of information technology, and in particular to a metadata exchange method and switching node based on opportunistic networks. Background technique [0002] Opportunistic network is a network that does not require a complete link between the source node and the target node, but uses the encounter opportunities brought by node movement to realize communication. Data forwarding is an important application and research hotspot in the opportunistic network. [0003] When two mobile nodes that establish a communication connection are in the process of data transmission, they need to go through two stages: metadata exchange and actual data transmission. In the metadata exchange stage, the nodes first exchange their own metadata, such as the summary information of the data contained in the node, the movement information of the node or the node resource attribute, etc., and then each node calculates the utility based on the re...

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Application Information

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IPC IPC(8): H04W80/08H04W84/18
Inventor 蒋昌俊陈闳中闫春钢张亚英陈凯张栋良白星振
Owner TONGJI UNIV
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