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Модель оценки задержки передачи пакетов в сетях 5G в виде системы массового обслуживания с групповым обслуживанием и прогулками прибора
Integrated Access and Backhaul (IAB) technology implies the use of relays to increase the coverage area of the 5G base station and reduce deployment costs for network operators. However, the use of intermediate nodes leads to multi-hop radio transmission, which significantly affects the end-to-end packet delay. An additional delay is introduced by the intermittent operation of these relays, which are incapable of full-duplex wireless operation. Classic network bandwidth metrics do not allow to fully assess the impact of relays on the Quality of Service (QoS). Given the specifics of the 5G NR (New Radio) technology, which involves the transmission of IP packets by converting a sequence of bits into transport blocks, the resulting delays can be interpreted as the time required for the packet to pass from its transmission to the MAC level at the transmitting node to successful acknowledged receipt at the receiving node, if necessary, waiting for the mode switch this node to receive. In this work, a problem statement is defined for estimating this key metric using the apparatus of queueing networks (QN) in discrete time. The special features of the QN are the group arrivals and group departure.