V.A. Babkin - Expert, Mobile Telesystems PJSC (Moscow)
E.P. Stroganova - Dr.Sc.(Eng.), Professor, Moscow Technical University of Communication and Informatic
When assessing the quality of a communication network, one has to consider a sufficiently large number of quality pa-rameters that describe the communication network from one side or the other. Acceptable values of quality parameters can be a set of continuous, discrete or interval values, which in turn have boundary threshold values. In some cases, the values of the quality parameters may vary with time according to a certain law or depend on external conditions. When forming the rules for assessing the quality of the communication network, it is necessary to select for each of the rules a set of corresponding quality parameters. The same parameters can be included in a set of different rules and obey different conditions that define these rules. As a result of this interlacing of rules and parameters, there are interrelations between seemingly initially unrelated parameters and areas of their admissible values. As a result, in such a situation, it becomes quite important to establish an admissible range of parameter values that form boundary hyperplanes and even hyperspaces in a multivector space of quality parameters. Hyperspace can be either a single or an educated set of hyperplanes included in it.
In the article, an attempt is made to consider a sufficiently simple quality parameter, at first glance, in the form of the utilization level of the communication channel in the second level of the OSI model in connection with transmission of the user data packet over the channel. The transmission of the packet is considered from the point of view of its transfer using the Ethernet protocol and the use of various transport technologies in the form of overlaying the logical infrastructure on the channel communication network: virtual networks (VLANs), the use of MPLS technology and their combination. Each logical infrastructure separately or a combination thereof was considered as a separate network segment in the transmission path of the data packet and the relationship between the total throughput on the path from the packet sender to the receiver was estimated, and the interconnection of the capacity of each network segment with the channel utilization level estimate for each network segment was estimated. At the same time, channel-level changes were made in the transmission of the user data packet and changes in the main qualitative parameters of the communication network in the form of losses of transmitted packets and a change in the delay time for their transmission. Such an assessment takes into account the requirements of international recommendations (ITU-T and RFC) and the national regulatory framework of the relevant state regulatory bodies that relate to the issue of data transfer in packet-switched networks. When assessing the level of utilization, the influence of the hardware and software buffers of network devices along the transmission path of the data packet was also taken into account.
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