ONTOLOGICAL APPROACH TO SOLVING THE WORKLOAD RELOCATION PROBLEM IN A DISTRIBUTED MONITORING SYSTEM WITH MOBILE COMPONENTS BASED ON A DISTRIBUTED LEDGER

Abstract

The paper considers the problems associated with the organization of the computing processin monitoring systems with mobile components based on a distributed ledger (DL), including thetask of redistributing the computing load. The requirements for the functioning of modern distributedmonitoring systems include the coordinated operation of nodes of the entire system belongingto various layers of the computing environment, including foggy and edge layers, which are highlydynamic. The joint use of DL technologies and mobile components as part of distributed monitoringsystems makes it possible to expand the range of tasks solved by such systems, including due tothe fact that it removes issues related to the synchronization of geographically distributed copiesof data. However, with such an organization of a distributed system, it is necessary to take into account the following features of the computing environment: latency associated with data synchronizationat DL nodes, changes in the geographical location of mobile components, limitedonboard energy resources and high dynamism of the fog and edge layers. Previous studies haveshown that in highly dynamic computing environments, the use of the search space reductionmethod based on ontological analysis is effective. For the correct operation of this method, it isnecessary to develop an ontological model reflecting the features of the considered computing andcommunication environment, including DL and mobile components. In this paper a new ontologicalmodel of the functioning of a distributed monitoring system has been developed, taking intoaccount the presence of mobile components and DL nodes. Production rules for placing computationalload in foggy and edge layers have been developed and a software model has been implementedbased on them, which allowed a number of computational experiments to be carried out.The results of experimental studies have demonstrated the effectiveness of the proposed approachand the adequacy of the developed ontological model.