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Sensors 2012, 12(2), 1612-1624; doi:10.3390/s120201612
Article

Fast Decision Algorithms in Low-Power Embedded Processors for Quality-of-Service Based Connectivity of Mobile Sensors in Heterogeneous Wireless Sensor Networks

, * ,
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Department of Technologies of Computers and Communications, Polytechnic School, University of Extremadura, Campus Universitario s/n, 10003 Cáceres, Spain
* Author to whom correspondence should be addressed.
Received: 6 December 2011 / Revised: 13 January 2012 / Accepted: 2 February 2012 / Published: 7 February 2012
(This article belongs to the Special Issue Microprocessors and System-on-Chip)
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Abstract

When a mobile wireless sensor is moving along heterogeneous wireless sensor networks, it can be under the coverage of more than one network many times. In these situations, the Vertical Handoff process can happen, where the mobile sensor decides to change its connection from a network to the best network among the available ones according to their quality of service characteristics. A fitness function is used for the handoff decision, being desirable to minimize it. This is an optimization problem which consists of the adjustment of a set of weights for the quality of service. Solving this problem efficiently is relevant to heterogeneous wireless sensor networks in many advanced applications. Numerous works can be found in the literature dealing with the vertical handoff decision, although they all suffer from the same shortfall: a non-comparable efficiency. Therefore, the aim of this work is twofold: first, to develop a fast decision algorithm that explores the entire space of possible combinations of weights, searching that one that minimizes the fitness function; and second, to design and implement a system on chip architecture based on reconfigurable hardware and embedded processors to achieve several goals necessary for competitive mobile terminals: good performance, low power consumption, low economic cost, and small area integration.
Keywords: heterogeneous wireless sensor networks; mobility; vertical handoff; quality of service; fitness; embedded processors; FPGA heterogeneous wireless sensor networks; mobility; vertical handoff; quality of service; fitness; embedded processors; FPGA
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Jaraíz-Simón, M.D.; Gómez-Pulido, J.A.; Vega-Rodríguez, M.A.; Sánchez-Pérez, J.M. Fast Decision Algorithms in Low-Power Embedded Processors for Quality-of-Service Based Connectivity of Mobile Sensors in Heterogeneous Wireless Sensor Networks. Sensors 2012, 12, 1612-1624.

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