TFG: Design and development of a reliable routing protocol for Wireless Sensor Networks

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Wireless Sensor Networks, or WSN, is one of the most promising fields of research when talking about Information Technology, as its use and deployment is extended in developing projects related to Internet of Things.

WSN are composed by multiple wireless tiny sensor nodes called motes, which are equipped with a microcontroller and some sensors capable to measure physical data of the parameter to be monitored. They also feature one or several radio antennas, meant to share the gathered data with the rest of the sensor nodes in the network.

Many projects have been developed using WSN, all of them with the common characteristic of the need of sharing data among nodes. This is achieved by the implementation of a network protocol on the nodes.

Different research lines have been followed and scientific papers have been published related to the field of WSN network protocols, most of them focused on the creation of algorithms and theoretical work rather than on field implementation and actual deployment of the network protocol on physical nodes.

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Multihop packet sending between nodes on WSN

The final objective of this thesis is the development of a realiable routing protocol for WSN, which is meant to establish routes among the nodes which later will be used as paths for sending and receiving data. It will be ready to use for stablishing networks on any project based on WSN developed by the B105 Electronic Systems Lab Research Group, regardless of its application or purpose. Multihop will be one of the main features on this routing protocol.

This protocol has been designed to be reliable, customizable and adaptable to the different needs a WSN developer may have. Its code is portable to different motes, and has been developed as a process running within the FreeRTOS operating system, which is node sensor oriented. Besides, the Contiki netstack, Rime, and its customized layer of communication services provided by the B105 Electronic Systems Lab, have been the main sources of primitive communication modules used on the development of this routing protocol.

Thesis Proposal: Methodology for Implementation of Synchronization Strategies for Wireless Sensor Networks

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Author: Francisco Tirado-Andrés

Advisor: Alvaro Araujo Pinto

Synopsis:
Wireless Sensor Networks (WSN) are networks composed of a large number of small devices that take measurements, process them, and communicate with other devices coordinating their operations. Time synchronization is necessary for that coordination of actions.

Multiple features characterized a WSN. Some of them are Power Consumption, Cost, Network type, Security, Data throughput, Scalability, etc.

WSNs bring us many benefits over traditional wired networks, but they also add difficulties to counteract its limitations.

The functionality of a WSN is very specific to the problem it solves. It is therefore that no single synchronization method is optimal along all axes. Unnecessary synchronization wastes resources; insufficient synchronization leads to poor application performance.

The requirements that are entailed to the various parameters that define the synchronization protocol will come imposed by the specific application to which it is oriented.

Because, it is not the same an application for a distributed humidity control in a natural park where each sample is collected every half hour and synchronization may deviate seconds without affecting the results, that the conditions required for an application of Wireless Surround Sound System where real-time operations and very small deviations are needed for a proper operation of the system.

But today there is no methodology that helps to design or configuration. Neither with the synchronization protocols nor the general system parameters.

There are many difficulties to be resolved because the synchronization protocol must meet not only the requirements of the application for which is designed, but also the intrinsic demands of WSNs.

One application where the results are very dependent on the accuracy of timing synchronization is Structural Health Monitoring (SHM). A configurable protocol which is able to adapt itself to the requirements of the application and the requirements of the system will be more useful and it will be ready for future applications and requirements.

My intention is to contribute, both during, and at the end of this thesis, with a methodology to guide and help implement synchronization protocols in Wireless Sensor Networks. Always keeping in mind that the synchronization protocol must meet requirements of accuracy and precision at the same time should not interfere with the performance of other tasks in the system. In that way the user will be able to adapt the configuration of the system and the parameters to get a productive WSN.

BackToTheFuture-Synchronization
Movie: Back To the Future. 23’17”