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In this paper the task of communication and computational resources allocation in systems based on SOA paradigm is considered. The task of resources allocation consists in assigning resources to each incoming service request in such a way, that required level of the quality of service is met. Complex services performance time in distributed environment is assumed as the quality of service measure. Models of the system and analysis of service response time presented in this paper allowed to formulate several tasks of resource allocation in terms of well known quality of service assurance models: best effort, IntServ and DiffServ. For each formulated task solution algorithms were proposed and their correctness was evaluated by means of simulation.