6 research outputs found
Análisis de factores que generan pérdidas de información en una transmisión de datos con TCP en redes heterogéneas
The evolution of communications over time has been changing and vertiginous. The constant increase in transmission speeds, the mix of media and the need to provide mobility to the nodes of a network have introduced new challenges. One of these challenges was to develop more efficient protocols that could adequately solve problems such as congestion effects anddata loss. The objective of this report is to analyze the different factors that are the cause of the loss of data, transmitted through the TCP protocol in heterogeneous networks and also to analyze some existing solutions.La evolución de las comunicaciones a lo largo del tiempo ha sido cambiante y vertiginosa. El aumento constante de las velocidades de transmisión, la combinación de medios y la necesidad de dotar de movilidad a los nodos de una red, han introducido nuevos desafíos. Uno de estos desafíos fue desarrollar protocolos más eficientes, que pudieran resolver en forma adecuada, problemas como efectos de congestión y la pérdida de datos. El presente informe tiene como objetivo analizar los diferentes factores que son causantes de las pérdidas datos, transmitidos mediante el protocolo TCP en redes heterogéneas y además de analizar algunas soluciones existente
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Integrated Scheduling and Beam Steering for Spatial Reuse
This document describes an approach to integrating antenna selection and control into a time-division MAC scheduling process. I argue that through such integration it is possible to achieve greater spatial reuse and interference mitigation than by solving the two problems separately. Without coupling between the MAC scheduling and physical antenna configuration processes, a \u22chicken-and-egg\u22 problem exists: If antenna decisions are made before scheduling, they cannot be optimized for the communication that will actually occur. If, on the other hand, the scheduling decisions are made first, the scheduler cannot know what the actual interference and communications properties of the network will be.
This dissertation presents algorithms for optimal spatial reuse TDMA scheduling with reconfigurable antennas. I present and solve the joint beam steering and scheduling problem for spatial reuse TDMA and describe an implemented system based on the algorithms developed. The algorithms described achieve up to a 600% speedup over TDMA in the experiments performed. This is based on using an optimization decomposition approach to arrive at a working distributed protocol which is equivalent to the original problem statement while also producing optimal solutions in an amount of time that is at worst linear in the size of the input. This is, to the best of my knowledge, the first actually implemented STDMA scheduling system based on dual decomposition. This dissertation identifies and briefly address some of the challenges that arise in taking such a system from theory to reality