quality of service

This paper is devoted to the problem of efficient and reliable resource management in mobile operator core networks implemented using Network Function Virtualization, with a particular focus on determining when reconfiguration of virtualized network functions should be performed. The task addressed in the paper is the development of a method for adaptive selection of the reconfiguration interval that balances the conflicting requirements of resource efficiency, quality of service guarantees, and operational overhead caused by frequent reconfigurations.

The quality of service models of telecommunication networks was considered. The features of providing of quality of service in the telephone and computer networks was explored. On the basis of this research it sets, that the metropolitan telephone networks are characterized by a higher accuracy, dependability and security by comparison to the computer local area networks. Substantial advantage of computer local area networks above the metropolitan telephone networks is providing a higher speed of the user information transfer, although defect there is an instability of this speed.

The model of self-similar traffic is widely used, but some tasks of assessing the quality of service in the packet network are unresolved. It is known that in the presence of self-similarity properties in the incoming stream of requirements with increasing load intensity ρ, the quality of service characteristics deteriorate, but not as much as is assumed by the Norros method. The discrepancy between the results of modeling and estimates obtained by the Norros method is hundreds of percent.

The network architecture of the content delivery network (CDN) and methods of the load balancing were examined in this paper. We have described the algorithm of end users’ request routing which allows selecting the optimum edge server to receive a content with maximum quality. The use of network system monitoring was offered. This system allows to efficiently assess the status of the network and promptly report possible problems. It was defined which parameters are needed to be monitored.

The investigation has covered buffer resource and queue management as main and the most important network traffic parameter and access control and overload mechanism. Network devices interaction model can performed by three levels:
-    physical layer;
-    protocols layer;
-    queues consolidating two previous levels.

This paper considers the options for combining routing algorithms in a single method for multiservice communication networks.

In this article it was suggested a solution of topical scientific and practical problem associated with the development of flow-based model of multipath routing by overlapping by nodes paths within the Telecommunication Network (TCN). The model is a further development of the well known multipath routing model based on the introduction to the structure of non-linear constraints responsible for the calculation of routes that intersect at nodes.

Unified network platform to support voice, data and multimedia applications is attractive for optical level. Optical packet switching (OPS) provides a platform where the only transport data unit for all type of traffic will be package. On the other hand, quality of service (QoS), class of service (CoS) and the type of service (ToS) required for the future of the Internet more elaborated and more powerful control plane. Optical switching labels (OLS) supports OPS, optical flow switching (OFS) and optical burst switching (OBS) with full interoperability of QoS, CoS and ToS.