Mobile Sink data collection method applied to wireless sensor network and used for node internal-memory resource sharing

Abstract

The invention discloses a mobile Sink data collection method applied to a wireless sensor network and used for node internal-memory resource sharing. A mobile Sink moves along a preset track at a constant speed, stops RP points uniformly distributed in the network and collects node data in a K jump generation tree formed by taking the RP point as a root. Caching emergency and time emergency are defined, and internal-memory pressure can be relieved by sharing internal-memory resources with adjacent nodes in a same tree when nodes are in caching emergency, and internal-memory pressure can be received by sharing internal-memory resources of adjacent trees when the tree is in caching emergency. Packet loss caused by overflow of internal memory of the nodes is reduced through internal-memory resource sharing among the nodes. During time emergency, the nodes actively upload data packets of time emergency to the mobile Sink, so that the data packets are disabled to exceed a deadline due to transmission delay.

Description

technical field [0001] The present invention belongs to wireless sensor network data collection technology, specifically the present invention relates to a kind of inter-node memory resource sharing on the basis of K-hop spanning tree topology, carries out local data collection, and applies it to the mobile Sink data collection of wireless sensor network method. Background technique [0002] Wireless sensor networks play an important role in many applications, such as routine data collection, remote malicious location detection, emergency response, etc. Wireless sensor networks are composed of a large number of tiny and cheap sensor nodes deployed in the monitoring area, and these nodes are usually powered by batteries and have limited memory resources. In practice, battery replacement is usually uneconomical and inoperable. The limited storage space limits the amount of sensing data that nodes can store. Therefore, network lifetime and buffer overflow are two important p...

AI Technical Summary

Problems solved by technology

[0009] 1. When the mobile sink collects local data in the network, the sink needs to traverse all or part of the nodes in the network. Due to the low speed of the mobile sink, the data transmission delay is relatively large; and for the data transmission caused by the low-speed movement of the sink Insufficient consideration is given to the fact that the data packet exceeds the deadline caused by the delay;

[0010] 2. Due to the delay in the transmission of data to the Sink, the node needs to cache the perceived data. Due to the hardware limitation of the sensor node itself, there may be memory overflow that may cause data packet loss;

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