Εξοικονόμηση ενέργειας στα ασύρματα δίκτυα αισθητήρων με ενεργειακά αποδοτική δρομολόγηση
Νικολιδάκης, Στέφανος Α.
In this thesis, the energy consumption and its influence on the performance of wireless sensor networks is described. Intially, the classification of the proposed routing protocols in wireless sensor networks is presented. Also the strengths and weaknesses of each protocol are emphasized by presenting a comparison which is based on the main parameters that characterize a wireless sensor network. Then, ECHERP, an energy-efficient protocol for wireless sensor networks, is proposed. ECHERP along with the number of rounds considers the current and the estimated future energy level of nodes, which may result to the maximization of the network lifetime. The protocol calculates the energy consumed by using the Gauss algorithm, in order to minimize the total energy consumption of the network in each round. Then, the analysis of automated irrigation in agriculture through the use of a new system for efficient irrigation using wireless sensor networks is discussed. The proposed system is based on a model that performs efficient management irrigation by finding appropriate programs for the rational use of water for irrigation. Also, HYCLRP, a TDMA/CDMA protocol, is proposed. HYCLRP minimizes energy consumption by assigning codewords with shorter lengths and select as head nodes that minimize interference. This is achieved by selecting the node with the highest residual energy and the smallest total distance from the others. The network is modeled as a graph and selects colors to avoid interference. The nodes, based on the colors of the graph, use codewords that minimize energy consumption in the network. The performance of the protocol is evaluated by simulations. Finally, the most important scientific discoveries of the thesis as well as a series of open research issues that emerged during the execution thereof are presented.