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Indicating its own position is an important ability for a mobile wireless node. As a matter of fact, it is a key enabler for future applications in fields as diverse as routing, security, logistics, entertainment and so on. This position can be computed in many different ways. In a protocol-based approach to positionning, the foundation of this localisation service is the ranging protocol. In this...
The Internet of Things promises an always-connected future where the objects surrounding us will communicate in order to make our lives easier, more secure, etc. This evolution is a research opportunity as new solutions must be found to problems ranging from network interconnection to data mining. In the networking community, innovative solutions are being developed for the Device Layer of the Internet...
One of the objectives of applications based on Wireless Sensor Networks, and more generally the Device Layer of the Internet of Things, is to make human life better. In order to seamlessly become part of our daily lives, future networks may require nodes with the ability to self-localise: for instance, to map collected measurements to a precise location without human intervention. Localisation techniques...
During this decade, Wireless Sensor Networks received an increasing amount of attention from the industrial and research world. One of their applications is the indoor localization of nodes. A distance evaluation mechanism between nodes, called ranging, is required to precisely determine the nodes' positions. The research work presented in this article relates to this topic and aims to use Ultra Wide...
The ability for the nodes in a Wireless Sensor Network to determine their position is a desirable trait. Routing as well as other client applications can benefit from this information. In this paper, we introduce the results obtained from our UWB-based prototype. We implemented two adaptations of the Symmetric Double-Sided Two-Way Ranging (SDSTWR) protocol, namely Sequential Symmetric Double-Sided...
Localization is a fundamental issue for many applications in wireless sensor networks. Without the need of additional ranging devices, the range-free localization technology is a cost-effective solution for low-cost indoor and outdoor wireless sensor networks. Among range-free algorithms, DV-hop (Distance Vector-hop) has the advantage to localize the mobile nodes which has less than three neighbour...
In this article, we study the behaviour of an Ultra-Wide Band (UWB) physical layer when executing our protocol Parallel Symmetric Double-Sided Two-Way Ranging. We compare it to the reference protocol introduced in IEEE 802.15.4a Symmetric Double-Sided Two-Way Ranging, in terms of precision of the obtained estimates and to other existing protocols such as SDS-TWR-MA and D-TWR in terms of overhead....
IEEE 802.15.4 is a widely adopted foundation for the lower layers of wireless sensor networks. This standard has recently started to take localization into account. This has led to the addition of two new PHY layers, Ultra-Wide Band (UWB) and Chirp Spread Spectrum (CSS), but also the specification of a Time Of Flight-based ranging protocol named Symmetric Double-Sided Two-Way Ranging (SDS-TWR). This...
Applying Localization methods to a Wireless Sensor Network (WSN) is not simply a matter of proposing an algorithm. Several aspects must be taken into account as they influence the performance of both the localization service and the network. Network lifetime and medium availability are key ressources that the localization service should not monopolize: the proposed protocol must be designed in order...
This paper presents a new synchronization protocol suitable for light nodes in a Wireless Sensor Network. This protocol, called SISP, is detailed with its algorithm and its sequence diagram. The simulation results obtained with a dedicated simulator are completed by the results of prototyping. The results show the effectiveness of SISP. Several prospects are discussed in conclusion.
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