Jose Manuel Gutierrez Lopez

Multilevel network characterization using regular topologies

Multilevel networks have been a good solution in large-scale networks scenarios. The implementation of a network into different levels or sub-layers improves the performance and reduces the investment against plain topologies. This paper tries to characterize important parameters on multilevel networks such as diameter, average distance and gateway location to be able to optimize the global network topology with no need for additional path calculations. The study focuses on the lower level of the network formed by subnetworks with regular structures such as Single Ring, Double Ring and Torus Grid. The achieved results will ease and improve the network planning of large-scale networks.

Improving topological routing in N2R networks

Topological routing is basically table free, and allows for very fast restoration and thus a high level of reliability in communication. It has already been satisfactorily proposed for some regular structures such as Grid or Honeycomb. An initial proposal has also been developed for the N2R structures. This paper proposes a modification of this previous algorithm, and in addition two other alternatives. The three options are systematically analyzed in terms of executing time and path distances, showing that trade-offs are needed in order to determine which algorithm is best for a given case. Also, the possible practical applications the methods could have, are discussed for different traffic scenarios.

Protection mechanism for the N2R topological routing algorithm

The topological routing over N2R structures has previously been studied and implemented using different techniques. A first approach was achieved obtaining the best trade off between path length vs. path completion time for the shortest path between any pair of nodes. This paper introduces protection against failures by modifying the previous algorithm implementing the option of routing a packet using a second independent path. The goal is to prove that there is an easy and efficient method to route topologically a packet (in case of a failure) using an alternative path with no record at all of the original.

A Test-bed for Topological Routing in 4-regular Grid Structures

The paper presents a test-bed developed for the visual analysis and demonstration of topological routing in 4-regular grid structures. The 4-regular grid structures are simple, node and line symmetric, planar, yield good table free, less complex adaptive routing properties, and have been analyzed extensively to use for the next generation large-scale ICT infrastructures. The test bed was named i3 (intelligent ICT Infrastructure) test-bed. One of the aims was to make it publicly available for academic use and demonstrations. The i3 test-bed consists of 37th nodes/computers, among them 36 are local nodes interconnected each other in peer to peer fashion, and 37th node is a master node used for controlling and monitoring the local nodes. The local nodes can be regarded as autonomous machines making all the routing routing decisions locally. All the nodes are equipped with individual displays in order to visualize or monitor the various events. The test-bed provides a power full tool to visually analyze routing and restoration scenarios. The test-bed is also a proof of concept for topological routing in 4-regular grid structures.

Data Analytics for Low Voltage Electrical Grids.

At the consumer level in the electrical grid, the increase in distributed power generation from renewable energy resources creates operational challenges for the DSOs. Nowadays, grid data is only used for billing purposes. Intelligent management tools can facilitate enhanced control of the power system, where the first step is the ability to monitor the grid state in near-real-time. Therefore, the concepts of smart grids and Internet of Things can enable future enhancements via the application of smart analytics. This paper introduces a use case for low voltage grid observability. The proposal involves a state estimation algorithm (DSSE) that aims to eliminate errors in the received meter data and provide an estimate of the actual grid state by replacing missing or insufficient data for the DSSE by pseudo-measurements acquired from historical data. A state of the art of historical and near-real-time analytics techniques is further presented. Based on the proposed study model and the survey, the team near-real-time is defined. The proposal concludes with an evaluation of the different analytical methods and a subsequent set of recommendations best suited for low voltage grid observability.

Network Structures Constructed on Basis of Chordal Rings 4th Degree

In this paper, on analysis of the properties of modified chordal ring 4\(^\textrm{th}\) degree topologies has been presented. Two special types of these structures, namely optimal and ideal graphs, have been defined. The basic parameters (diameter and average path distance) were calculated and described by approximate formulas which makes possible to evaluate these parameters for any modified graph proposed by authors, and it gives possibility to model the properties of these networks without requiring any specific path calculation between pairs of nodes which may be time and resource consuming for large scale systems. In the last part of paper the comparison of the analyzing structures and reference graph has been carry out.