ИССЛЕДОВАНИЕ ХАРАКТЕРИСТИК СХЕМ РЕТРАНСЛЯЦИИ СИГНАЛА В БЕСПРОВОДНЫХ СЕТЯХ ДАТЧИКОВ

Abstract

Wireless sensor networks (WSNs) are being actively implemented in various systems for remoteobservation and monitoring of distributed objects. WSNs have a number of undoubted advantages:flexibility, efficiency, relative cheapness, and the possibility of rapid deployment. However,the exchange of information and data is carried out in the WSN using wireless communicationchannels, which are subject to inevitable interference and noise, which leads to transmission errors and even to the loss of transmitted data packets. Another challenge, not fully resolved, is theuneven distribution of consumed energy within the WSN in the face of stringent requirements forenergy sources. Currently, there are two most widely used retransmission schemes in the loss oftransmitted data, namely, hop-by-hop and end-to-end. Most of the well-known studies devoted tothe issues of reliable data transmission in WSN using these schemes have been carried out experimentally.In addition, there are still no analytical methods for evaluating various reliabletransport solutions, which complicates the analysis of the proposed WSN. Therefore, the aim of theproposed work is the development of analytical methods and algorithms for studying the operatingcharacteristics of the signal relaying circuits in the WSN. Analytical methods are proposed forevaluating retransmission schemes in the WSN, based on a relatively new theoretical basis - thenetwork calculus for packet-switched networks, which is a tool for determining the size of the network.First, traffic, service and energy cost models are introduced. Based on these models andnetwork calculations, the maximum packet transmission delay and energy efficiency of the twomain types of retransmission schemes: hop-by-hop and end-to-end retransmission, are analyticallyestimated. According to the results of the experiment, the maximum latency and the maximumpower consumption of these two schemes are compared in several scenarios. In addition, the analyticallycalculated maximum delay is compared with the simulation results. With the proposedmethod, a suitable retransmission scheme can be selected based on the various requirements andconstraints to be set.