Made available in DSpace on 2015-04-22T22:00:52Z (GMT). No. of bitstreams: 1 Dissertacao_Alexandre Lopes.pdf: 2105277 bytes, checksum: 2f8d59afe6f1a33f9fb5978e5f6328a7 (MD5) Previous issue date: 2010-07-01 / FAPEAM - Fundação de Amparo à Pesquisa do Estado do Amazonas / This work presents a modular architecture for hardware development and integration of various technologies of wireless communication (Bluetooth, GSM / GPRS and ZigBee) in a gateway for Wireless Sensor Networks (WSNs). Thus, the proposal seeks to address an issue not widely explored in a practical way that is the local and remote collection of data from geographically distributed networks. The objective of this research is to focus on practical technological aspects that allow the integration of different technologies in a practical and real hardware platform. The proposed architecture includes power management and selection of several technologies for wireless communication that will be used according to the application. To validate the proposed architecture case study is carried out in order to present the results achieved during the experiments. / Este trabalho apresenta uma arquitetura modular de hardware para viabilização e integração de diversas tecnologias de comunicação sem fio (Bluetooth, GSM/GPRS e ZigBee) em um gateway para Redes de Sensores Sem Fio (RSSFs). Desta forma, a proposta visa solucionar um problema pouco explorado de forma prática, que consiste na coleta presencial e remota de dados de redes geograficamente distribuídas. O objetivo é concentrar essa investigação em aspectos tecnológicos práticos que permitam a integração de diferentes tecnologias em uma solução prática e real. A arquitetura modular proposta contempla o gerenciamento de energia e a seleção da tecnologia de comunicação sem fio que será utilizada de acordo com a aplicação. Para validação da proposta um estudo de caso é realizado com o intuito de apresentar os resultados alcançados durante os experimentos realizados.

An analytic framework is devised for the performance modelling and evaluation of a wireless Global System for Mobile Telecommunication (GSM) cell with General Packet Radio Service (GPRS) supporting both multiple class voice and data services, respectively, under an aggregate sharing scheme (ASS). The investigation focuses on the study of a proposed GE/GE/c/N/PR/CBS queueing system with c (¿1) servers, finite capacity, N (¿c), generalised exponential (GE) GSM/GPRS interarrival and service times under pre-emptive resume (PR) priority rule and complete buffer sharing (CBS) scheme. The principle of maximum entropy (ME) is used t ocharacterise new closed form expressions for the state and blocking probabilities, subject to appropriate GE-type queueing theoretic constraints per class. Typical numerical examples are included to validate the ME solution against simulation at 95% confidence intervals and study the effect of external GMS/GPRS bursty traffic upon the performance of the cell.

This master thesis deals with a data remote transmission by means of SMS and GPRS technology. The overview of current solutions is presented and then a remote temperature measurement and a data transmission employing a communication module GSM/GPRS TM1 through GSM network using GPRS technology is described. As a response to an impulse, the communication module sends SMS. The technical solution is described in details including HW and SW design of the data transfer and processing equipment using a ATmega 162 microprocessor. This equipment communicates with a server (PC), which displays the measured temperature. A prototype which was used for a validation of the design is also described.