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The main goal of the CDN network (content delivery network) is delivery content (information) to endusers with high availability and high performance and adequate quality. And so also solve some problems such as improving global availability and reducing bandwidth. It was suggested that the use of a monitoring system allows to have the latest information about the status of any server and make optimum...
In this paper analysed different spectrum decision methods in a Cognitive radio network. An analytical system model proposed to compare channel selection algorithms by main operational parameters to minimize total system selection time. The considered methods which are based on balancing traffic load can distribute secondary users load to multiple channels, in contradistinction to non-load-balancing...
There is a spectrum of solutions are available for distributing content over the Internet today. One of these solutions is Content distribution networks (CDN). CDN need to make decisions, such as server selection and routing, to improve a performance of content distribution. But we must remember, that performance may be limited by various factors such as packet loss in the network, a small receive...
Recent interesting activities in spectrum analysis have introduced an additional band, the 5 GHz unlicensed spectrum, which has been primarily used for Wi-Fi. There are many challenges related to the coexistence of two different networks, a Wi-Fi network and an LTE network, sharing unlicensed bands but causing interference with each other. In this article, to solve the coexistence challenges, we propose...
In this paper considered spectrum mobility techniques for cognitive radio that based on spectrum sensing. Cognitive Radio (CR) is the newest technology to make the secondary users to make use of licensed spectrum in the opportunistic manner. In the proposed structure, politics of switching channel and a proactive spectrum handoff protocol are let cognitive users use a channel before a primary user...
This paper considers concept content delivery network (CDN) system. We propose architecture, for select the optimum route and server for a user request, based on the objective functions. The main criterions of the objective function were taken delay time, server load and probability of packet lost. We will describe the main task of the load balancing system.
In this paper, spectrum sensing methods analysis and comparison are presented. The spectrum sensing techniques implementation challenges and issues are discussed in detail giving comparative study of various methodologies. The false alarm probability and missed detection probability have been calculated and their dependences are determined.
The basic principles of data buffering at a multiservice traffic service node were reviewed. A multilevel data buffering mode was proposed for nodes that serves a large amount of TCP traffic. Each level of the model has its own characteristics and is relatively independent. Optimization of the data buffering multilevel model to ensure a satisfactory quality of service in a multiservice data network...
This paper has proposed the analysis of network traffic real multiservice data network, defines its parameters and properties. A mathematical model to evaluate the quality and time parameters of unit maintenance of network traffic was selected.
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