Specification, design, and development principles of the future internet are enmeshed in the communication system. This term encompasses the emergence of future large multi-dimensional high-speed heterogeneous and interconnected networked ICT infrastructures to facilitate new groundbreaking trends like the internet of things (IoT) together with the communication system. In this research, an analysis of NdR structures has been carried out, and a comparison to chordal rings of 4th degree made. It was found that there do not exist optimal NdR structures with the number of nodes in one ring greater than 5. It was discovered that there is a close correlation between NdR structures and 4th-degree chordal rings that make it possible to choose NdR structure with the minimum diameter and average path length based on the analysis of correlated chordal ring graphs. It simplifies and shortens the process of choosing the best length of the inner ring chord.
TopIntroduction
One of the critical problems in designing communication systems is in choosing the topology of the internal communication network as it has a major impact on the efficiency, speed, reliability and cost of the entire system (Al-Janabi & Salman, 2021). Nowadays, the analysis of normal network structures is one of the most important issues in communications and computer science.
These networks can be modeled by symmetric digraphs, i.e., a directed graph G with vertex set V(G) and edge set E(G), such that, if [vi, vj] is in E(G), then [vj, vi] is also in E(G). So any edge of a digraph connecting vertices vi and vj can be replaced by two directed edges [vi, vj] and [vj, vi] (Monther & Tawalbeh, 2020).
The best service and reliability parameters can be obtained by forming complete networks (described by a complete graph), but due to cost and practical implementation issues only small networks can be built in this way. In (Gemalto, 2020) a survey of known topologies has been presented. Among the analyzed topologies that would be used in designing the distributed structures, the authors of this article have chosen rings as they are simple, extensible and widely used today. They are characterized by connectivity equal to 2, implying survivability in case of damage of one edge or node. They are inexpensive (number of edges is equal to the number of nodes), regular and symmetric, but possess poor transmission parameters.
Halfway between the complete graph and the ring is the chordal ring structure (Tawalbeh et al., 2020). It is a ring with additional chords, and can be defined by the pair (p,Q), where p is the number of nodes in the ring and Q is the set of chords. Each chord connects every pair of nodes at a distance qi within the ring. The application of this type of structure is useful due to its simplicity, regularity, resistance to damages, simplicity of routing, and good extension possibilities (Gemalto, 2020).
We have divided the objectives into groups, being these groups aligned with the structure. In the following, we briefly explain each of the different groups and detail the specific objectives inside them. The first group of objectives is the one that maps with WP1, that is, the objectives related to the study of the IoT and cloud computing scenarios, from where we will proceed with the analysis and specification of the safety measure security requirements, followed by specification and design of the security framework.