RFID Reader Anticollision Protocols for Dense and Mobile Deployments

Abstract

Abstract:The rapid development of RFID (Radio Frequency IDentification) technology has allowed its large adoption and led to increasing deployments of RFID solutions in diverse environments under varying scenarios and constraints. The nature of these constraints ranges from the amount to the mobility of the readers deployed, which in turn highly affects the quality of the RFID system, causing reading collisions. Although several solutions were proposed to engage the issue of reading collision, few were ever concerned with the densification and/or mobility of readers. This paper proposes two distributed TDMA (Time Division Multiple Access) approaches designed to reduce these collisions through local coordination between neighboring devices for different scenarios tested here. The first proposal is based on a reservation phase organized between readers with different priority levels given to readers depending on their previous success. The second one takes advantage of the particular case of RFID collisions, allowing a local and mutual decision of each reader to access or not tags in their vicinity. Simulations were run over different stressful environments in terms of tag/reader density and mobility, proving that our proposals achieved the best performance in terms of throughput, collision avoidance and coverage delay when compared to other collision reducing schemes.

Using Fuzzy Logic for data priority aware collection in RFID sensing wireless networks

“…Their anti-collision results are not presented here since the modification added to these algorithms did not affect their performance regarding that aspect. They perform similarly to results obtained in [16], [20].…”

FTSMAC: A Multi-Channel Hybrid Reader Collision Avoidance Protocol for RFID Network

“…Secondly, Coverage Oriented Reader Anti-Collision (CORA) [41] is a distributed mono-channel TDMA-based solution for RFID networks with mobile and time-critical deployment. The reader performs local learning of its neighbors.…”

Data gathering solutions for dense RFID deployments

“…This could allow for an even easier tracking and better coverage. While the proposed solutions, mDEFAR and CORA, have already been extensively tested as anticollision algorithm in [2] and performed well, compared to the state-of-the-art, they still need to be validated with the data gathering proposed in this paper. One of the main challenges of applying this solution to a mobile scenario is the maintenance of the gradient architecture.…”

“…While an "off-the-shelf" wireless data collection solution applied to an RFID systems would not be able to care for the specification of both the application and the readers parameters. In [2], three distributed TDMA approaches were introduced to alleviate the issue. They were all compared to a state-of-the-art solution and provided much better performance in visited metrics.…”