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Multi-node collaboration based storage method for sensor network

A sensor network, multi-node technology, applied in network topology, transmission system, electrical components, etc., can solve problems such as excessive data volume, unbalanced energy and storage consumption, and achieve the effect of prolonging survival time

Inactive Publication Date: 2010-03-31
NANJING UNIV
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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of excessive data volume generated by many events sensed by a single node and the resulting unbalanced energy and storage consumption among different nodes, as well as to design large-scale multimedia sensor networks using network Methods for in-memory storage, network topology optimization and management of multiple copies of data in response to user queries

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  • Multi-node collaboration based storage method for sensor network

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Embodiment Construction

[0013] Phase 1: Determine how nodes collaborate

[0014] Calculate the time difference of the local time recorded by each node, and use the time difference to define the event identifier relative to the current moment. For example: after event E occurs, nodes A and B both sense the event and record it as T according to their respective local time AE and T BE , the moment of communication between A and B is T A and T B , by comparing whether

[0015] ΔT A (=T A -T AE ) = ΔT B (=T B -T BE ), to judge whether they monitor the same event.

[0016] After the event is identified, the node cooperation method is as follows: when the node sensing the event obtains the image data, it first caches the image data in the RAM of the node and extracts the image features, generates a cooperation message based on this, and then broadcasts it within the communication range as follows Query message in the format:

[0017] Msg

[0018] {

[0019] MsgType=QueryMsg; / / Message type de...

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Abstract

The invention provides a multi-node collaboration based storage method for a sensor network. The method comprises the following steps: (1) determining a node collaboration mode, which is to extract image characteristics and identification images on nodes of the sensor network, and determine a node set for data fusion; (2) determining an updating mode for storing and exhausting the nodes of the sensor network; (3) dynamically calculating the size of the most appropriate data of the nodes of the sensor network in each time of data updating or data transiting; (4) solving appropriate positions ofSink nodes by using a genetic algorithm; (5) constructing a hierarchical network topology structure to optimize a user search processing process by improving the TopDisc algorithm; and (6) optimizinga data searching process, which is to establish the data searching process driven by messages by establishing and managing multiple data transcriptions. The method is used for solving the problems ofmore events detected by a single node and unbalanced consumption of energy and storage among different nodes, and prolongs the life time of the network.

Description

1. Technical field [0001] Aiming at the large-scale wireless multimedia sensor network, the present invention designs a sensor network storage method based on multi-node cooperation, which can solve the problem of too fast energy consumption and storage consumption caused by many events sensed by a single node , the imbalance of energy and storage consumption between different nodes, and prolong the survival time of the network. 2. Background technology [0002] Wireless multimedia sensor network is a new type of sensor network formed by introducing audio, video, image and other multimedia information sensing functions on the basis of traditional wireless sensor networks (WSNs). Generally, it is also equipped with multimedia data acquisition equipment such as CMOS camera and miniature microphone. Compared with traditional WSNs that only have simple scalar (such as temperature, humidity, etc.) environmental data collection functions, WMSNs can sense multimedia information su...

Claims

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Application Information

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IPC IPC(8): H04L29/08H04W84/18
Inventor 陈贵海严允培
Owner NANJING UNIV
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