Abstract
Access nodes of NGN networks provide traffic aggregation to various network services and its transfer to the transport layer, which allows calling such networks multiservice. This network are used to simultaneously transmit voice, video, and data presented in the form of standard packets. At the same time, network services provide an unlimited set of telecommunication services with specified characteristics of quality of service. The selected technology of information distribution in the NGN determines the degree of complexity of access nodes and, of course, affects the quality of information exchange service between user terminals. One of the ways to ensure a given level of quality of service for each of the services is the introduction of priority service for certain traffic flows. Introducing priorities for packets is an effective way to manage the size of queues and the time spent in it. When a high-priority packet is received, a packet with a lower priority is either interrupted (absolute priority) or a high priority packet becomes the beginning of the packets queue (relative priority). In this paper, we study the characteristics of NGN access nodes as a two-priority queuing system with a limited expectation. The proposed formula for calculating the probability of loss of speech packets, as well as data packets, and other characteristics of the access node.
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