Abstract. Data transmission systems with a heterogeneous flow of queries of various criticality to the admissible time of stay in the system are considered. The possibilities of increasing the probability of timely and error-free delivery of packets due to their priority redundant service are analyzed. Priority and multiplicity of a reserved request (the number of copies of created queries) is set depending on the allowable waiting time, the backup copies of requests can be placed in queues of different priorities. Multichannel queuing system with the allocation of queues of different priorities is investigated. In the multichannel systems under consideration, all service channels are available for all priority queues. With a redundant service, the request is considered timely and error-free if at least one of its copies is accurately executed for the maximum allowable time. The effectiveness of the discipline of priority maintenance of the non-uniform flow of requests is determined by the probability of timely and error-free execution of all types of requests, with different multiplicities of their reservation and the maximum allowable waiting time. A simulation model for supporting the choice of design solutions for the organization of exchange through redundant channels implemented in the AnyLogic 7 environment is proposed. It is shown that increasing the reservation multiplicity for critical queries with a small load, leads to an increase in the probability of timely error-free servicing of all types of requests, and there is a limit of expediency of their reservation.

Keywords: network, reliability, criticality to the time of delivery, priorities, redundant packet transmission, packets, data transmission

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