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In this paper is proposed method of intellectual vertical handover that allows performing unloading of wireless heterogeneous access networks using multi-criteria network evaluation. An algorithm of handover functioning is further improved using fuzzy logic based on cloud technology. An imitation model is created for investigation of heterogeneous network with realization of proposed algorithm of initiation of vertical handover. A process of service provisioning by heterogeneous network is investigated based on created model. In the process of modeling it is shown that proposed algorithm allows choosing optimal cell for each individual user among available cells of different access systems.