ANALYSIS OF ANALYTICAL DECISIONS ON TRAFFIC PRIORITIZATION IN PACKET COMMUNICATION NETWORKS

Abstract

A comparative analysis of known solutions for traffic prioryment is proposed. Considered advantages and disadvantages of the described solutions, their impact on the characteristics of the quality of service in packet communication networks, application features and general recommendations for the use of these or other solutions. Models of priority systems are one component of the simulation of complex systems. For modeling systems, commonly used single-channel or multi-channel SMS with homogeneous or heterogeneous flow of applications (multiservice, packet). Influence of the service discipline on the main indicators of the quality of service quality in the presence of priority traffic is not fully investigated. Packet networks use two priority types: Space Priorities and Time Priorities. Spatial priorities determine the strategy of accessing different types of packages in the overall buffer, and the time priorities specify the rules for selecting packets from the queue for transfer to the server (channel). Spatial priorities affect the packet loss level, while delays of different types of packets in the buffer depend essentially on time priorities. Priority queue service ensures high quality of service for packets from the highest priority queue. If the average intensity of their arrival at the device does not exceed the bandwidth of the output interface (and the performance of the internal promotion blocks of the device itself), then the packets of highest priority always receive the bandwidth they need. The level of high priority packet latency is also minimal. However, it is not zero and depends mainly on the characteristics of the flow of these packets - the higher the flow ripple and its intensity, the more likely the occurrence of the queue formed by the packets of this high-priority flow.