Athanasios Paraskelidis

Efficiency and Benefits of Wireless Network Segregation

This paper examines the performance of segregate networks with single and multiple channels. It compares the simulation results to the location-aware channel assignment protocol named GRID. The term segregated means that the network is divided into smaller domains and each one operates on different radios. Each node is assigned a predefine pool of radios, per segregate. The results show that the average delay of the segregate is comparable to GRID topology, in some instances. We also demonstrate that the effect of single channel interference has been minimised and the throughput of the network has been increased, far more when multiple channel allocations are deployed within the segregate. Segregate networks are more robust in harsh environments and provide better data reliability.

Fault tolerance capability of cloud data center

In this era of big data and internet of things, the need for performance improvement in cloud data center is unavoidable. This has led to several designs of data center network topologies with the aim of achieving a data center that has the capability of tolerating fault during multiple failures. In this paper, we proposed improved variants of fat-tree interconnections to mitigate the challenges of fault tolerance. The availability of alternative paths for congestion control and fault tolerance gave Fat-tree an edge over other data center architectures, thereby becoming a widely used architecture for data center. Our focus is on client to server communications in a cloud data center network as explained in Fig. 7, hence simulation of HTTP application was carried out on different variants of fat tree designs. The simulation results with Riverbed showed that our proposed hybrid designs outperformed the Single fat tree designs as the number of link failures increase.