Time-limited Mobile Data Collection Studies In Sensor Networks

With the rapid development of micro sensor technology,embedded computing technology and low-power wireless communication technology,wireless sensor networks which integrate the three technologies have attracted widespread attention.Data collection is one of the hot topics in wireless sensor networks.However,in traditional wireless sensor networks,the nodes near the base station lead to premature exhaustion of their energy due to a large number of data forwarding tasks,which shortens the lifetime of the network.In this paper,we introduce energy sufficient mobile nodes to collect data to save the energy of ordinary sensor nodes,mainly including the following three aspects.1.The delay of data collection is usually large because of the movement speed constraints of mobile elements,so the delay in a large wireless sensor network can not be within our constraints.Therefore,we propose a data collection strategy based on WiFi to reduce data collection delay.In the network center,WiFi is set up,and as long as the MDC moves to the WiFi range,it can communicate directly with the sink node.The BMAD-EF algorithm based on the minimum mean time delay is proposed.This algorithm can improve the probability of MDC in the WiFi range in the mobile process,and the data collection delay can be proved through experiments.A substantial decrease.2.First we assign a weight to all nodes in the network,the weight of the node is equal to the number of packets that the node has to forward to the CP point multiplied by the hop to the CP point,and then a low complex weight based cache point planning algorithm(Based-Weight Cache Points Planning,BWCPP)is proposed,which can be moved.The mobile strategy of MDC at the same time and satisfy the delay constraint at the same time.3.Collecting data through multiple MDC mutual assistance can further reduce the total delay of data collection and save network energy consumption.So we propose a multi mobile element collaboration data collection model(MMECDGA),which uses two different types of mobile elements as mobile collector(MC)and mobile transponder(MT)to collect data in a wireless network through seamless and mutual assistance.