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1 Reader Anti-Collision in Dense RFID Networks With Mobile Tags
, 2011
"... Abstract—In a Radio-Frequency IDentification network, while several readers are placed close together toimprove coverage and consequently read rate, reader-reader collision problems happen frequently and inevitably. High probability of collision not only impairs the benefit of multi-reader deploymen ..."
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Abstract—In a Radio-Frequency IDentification network, while several readers are placed close together toimprove coverage and consequently read rate, reader-reader collision problems happen frequently and inevitably. High probability of collision not only impairs the benefit of multi-reader deployment, but also results in misreadings in moving RFID tags. In order to eliminate or reduce reader collisions, we propose an Adaptive Color based Reader Anti-collision Scheduling algorithm (ACoRAS) for 13.56 MHz RFID technology where every reader is assigned a set of colors that allows it to read tags during a specific time slot within a time frame. Only the reader holding a color (token) can read at a time. Due to application constraints, the number of available colors should be limited, a perfect coloring scheme is not always feasible. ACoRAS tries to assign colors in such a way that overlapping areas at a given time are reduced. To the best of our knowledge ACoRAS is the first reader anti-collision algorithm which considers, within its design, both application and hardware requirements in reading tags. We show, through extensive simulations, that ACoRAS outperforms several anticollision methods and detects more than 99 % of mobile tags while fitting application requirements. I.
Performance analysis of anti-collision protocols for RFID systems
"... Abstract — Recently RFID technology has made its way into end-user applications, enabling automatic item identification without requiring line of sight. In particular passive tags provide a promising, low cost and energy-efficient solution for inventory applications. However, their large-scale adopt ..."
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Abstract — Recently RFID technology has made its way into end-user applications, enabling automatic item identification without requiring line of sight. In particular passive tags provide a promising, low cost and energy-efficient solution for inventory applications. However, their large-scale adoption strictly depends on the efficiency of the identification process. A major challenge is how to arbitrate channel access so that all tags are able to answer the reader inquiries and identify themselves over time. This paper stems from the observation that a variety of anti-collision protocols for RFIDs have been proposed in the literature. However, a thorough simulation comparison among them and a clear identification of the mechanisms resulting in better end-to-end performance is lacking. The objective of our work has been to fill this gap. This paper presents the results of a detailed ns2-based comparative evaluation of representatives of all the classes of anti-collision protocols so far proposed. Simulation results show that end-to-end performance of the different classes of protocols in terms of metrics such as the time needed for tags identification differ significantly over what previously found by experiments which only focused on the number of reading cycles for tag identification. Our thorough performance evaluation has highlighted that different solutions are to be used in different application scenarios and that decreasing the collisions (rather than idle times) is the way to go to further improve anti-collision protocols performance. I.
2.1.1. Embedded Operating Systems 2
"... c t i v it y e p o r t 2007 Table of contents 1. Team.................................................................................... 1 ..."
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c t i v it y e p o r t 2007 Table of contents 1. Team.................................................................................... 1
Nathalie Mitton, David Simplot-Ryl. From the Internet of things to the Internet of physical
, 2011
"... HAL is a multi-disciplinary open access archive for the deposit and dissemination of sci-entific research documents, whether they are pub-lished or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L’archive ouverte p ..."
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HAL is a multi-disciplinary open access archive for the deposit and dissemination of sci-entific research documents, whether they are pub-lished or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L’archive ouverte pluridisciplinaire HAL, est destinée au dépôt et a ̀ la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d’enseignement et de recherche français ou étrangers, des laboratoires publics ou privés. From the Internet of things to the Internet of physical world
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, 2009
"... Multi-hop wireless networks (such as ad-hoc or sensor networks) consist in sets of mobile nodes without the support of a pre-existing fixed infrastructure. For scalability purpose, ad-hoc and sensor networks may both need to be organized into clusters and require efficient protocols to perform commo ..."
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Multi-hop wireless networks (such as ad-hoc or sensor networks) consist in sets of mobile nodes without the support of a pre-existing fixed infrastructure. For scalability purpose, ad-hoc and sensor networks may both need to be organized into clusters and require efficient protocols to perform common global communication patterns like the broadcasting operation. During a broadcasting task, a source node needs to send a same message to all other nodes in the network. Some desired properties of a scalable broadcasting are energy and bandwidth efficiency, i.e., message retransmissions should be minimized. In this article, we present a scalable broadcasting schemes that takes advantages of the clustering structure. In this way, we only build one structure to perform both self-organization and broadcasting in clusters and in the whole network. It appears that our broadcasting scheme presents the best trade-off between the number of retransmissions and transmitters (for energy saving) and reliability, when compared to existing solutions.
