Infocommunication technologies and communication systems
The current growth rates of the traffic volume of telecommunication multiservice networks impose strict requirements on them. This fact affects both small and regional networks. First of all, the convergence of services within one network requires communication channels to provide Quality of Service parameters.
The advent of multi-protocol label switching (MPLS) technology has made it possible to implement a number of mechanisms and methods for traffic control, including Traffic Engineering (TE), Traffic Engineering DiffServ, etc. Despite the numerous functionalities originally incorporated in these mechanisms, they are not fully implemented. Below is how bypass tunnels work.
Picture 1 – Bypass-tunnel on an Autobandwidth.(animation: 5 pics, 6 repetitions, 76 kb)
The mathematical models and methods on which the mechanisms for ensuring the quality of service parameters in the formation of TE tunnels are based are imperfect. Taking into account the requirements for the parameters of existing communication channels, it becomes necessary to find a balance between the required parameters of the quality of service and the actual parameters of communication channels.
The topic of the master's work – research and development of a method for improving the quality of service in telecommunication networks – is relevant, since the requirements for bandwidth and quality of service are increasing daily.
The purpose of the work is to increase the efficiency of the use of network resources while ensuring the specified quality of service parameters by developing method of improving the quality of service in telecommunication networks.
The main objectives of the research:
Research object: the process of ensuring the quality of service in telecommunication networks.
Research subject: models and methods for ensuring quality of service parameters in telecommunication networks.
Research methods: mathematical modeling, teletraffic theory, mathematical programming, simulation, ant colony optimization methods.
As part of the master's work, it is planned to obtain relevant scientific results in the following areas:
Modern ICS are complex hardware and software systems that must provide a given quality of service. For these purposes, the ICS control is used, which is a rather complex systemic complex task, which consists of a number of subtasks that are solved at various levels of interaction of open systems.
MPLS [1] is designed as a combination of two QoS models. This technology implements the basic platform of a set of tools for managing and redistributing traffic flows (TE) [2-4]. A feature of the MPLS architecture is the presence of a short header of a fixed length, a label, which is placed between the bytes of the protocol stack of the second and third levels of the open systems interaction model. Then the packet is transmitted over the MPLS domain according to this label. The binding to labels is carried out in accordance with the transfer class (FEC), which essentially reflects the requirements for quality of service (SLA). FEC can be composed of packets with common inside and outside nodes or combinations of the same class of service and the same inside or outside nodes, etc., implementing a differential service model.
The functions of filtering traffic according to transmission classes, the establishment and maintenance of TE-LSPs, as well as the management of traffic entering the MPLS network are carried out by the MPLS Border Routers (LER) of the domain. The functions of label switching, label insertion, and label removal are performed by label routers (LSRs). The above gives all the grounds for formalizing mechanisms for ensuring QoS parameters in MPLS technology
When moving to the concept of new generation networks, researchers pay special attention to the problems of traffic management. This is due to the need to tighten the provision of quality of service parameters. Traffic Engineering remains the main modern complex for ensuring the quality of service. This complex is implemented in the technology of multi-protocol label switching (MPLS). The analysis of the components of the complex to ensure the specified quality of service showed that the main mechanisms are: support of end-to-end QoS parameters "end-to-end" in the formation of requirements for the parameters of the TE-tunnels.
Tools that provide support for end-to-end QoS parameters include traffic control tools at the boundaries of MPLS domains. Thus, the analysis of queue management tools and queue service schedulers revealed that the most efficient are the latter in general and the schedulers with hybrid queue service, in particular.
At the moment, the Autobandwidth procedure remains the main procedure that forms the estimate of the throughput of the TE-tunnel being established. This procedure is based on traffic prediction.
According to the above, the topic of the master's thesis devoted to solving the problem of research and development of a method for improving the quality of service in telecommunication networks is relevant.
The aim of the work is to increase the efficiency of using network resources while ensuring the specified quality of service parameters by developing a method for improving the quality of service in telecommunication networks.
When writing this essay, the master's work has not yet been completed. The full text of the work and materials on the topic can be obtained from the author or his manager after that date.