THE METHOD OF FORMING THE LOWER BOUND OF THE STRUCTURAL RELIABILITY OF THE INFOCOMMUNICATION NETWORK

Abstract

It is shown in the article, that the tasks of estimation to reliability of infocommunication network (ICN) acquire all greater actuality both in the sphere of planning and during exploitation ICN. Reliability remains one of requirements to ICN, presented in recommendations of the ITU. ICN behave to the structural systems, that is why the special value for ICN acquire the question of estimation of structural reliability. It is marked, that at the calculation of structural reliability ICN most applied is a method that is based on taking into account of totality of ways and cuts, here a structural reliability of network index probability of faultless work of directions of connection, that is used for an information transfer in ICN, is considered. Insufficient scientific of question of determination of lower bound of structural reliability is shown ICN, that determines the assured level of structural reliability of both separate connections and network on the whole. The method for determining the lower bound of the structural reliability of ICN based on the formation of a set of sections is proposed. The idea of the method is based on binary coding of cuts, which leads to a clear formalization of the procedure for constructing a set of cuts in disjunctive normal form and, as a result, to the practical possibility of using the proposed method to determine the lower bound of structural reliability in modern ICN. An example of application of the proposed method is given, which showed the efficiency of the method in comparison with the known method based on the formation of a dual logical function of a set of paths, and then its transformation into a disjunctive normal form to obtain a set of cuts. Further development of this area of work can be: • search for a set of cuts to assess the lower bound of the structural reliability of individual links and the network as a whole for networks with an uncertain topology; • development of approaches to obtaining weighting factors that determine the importance of the lower and upper boundaries of structural reliability, as well as the importance of individual areas of communication.