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This work presents a distributed time slot assignment algorithm which adopts TDMA as Medium Access Control, specially suited to support applications with strict delay, jitter and throughput requirements characterized by convergecast traffic patterns in sensor networks. (E.g. wireless video surveillance sensor networks). Our algorithm has three characteristics: (1) Every node is guaranteed a path to...
The conventional sensor MAC is unconcerned with data aggregation. Therefore, this paper proposes a new MAC level Data Aggregation (MDA). The goal is to reduce energy consumption in WSN (Wireless Sensor Network). The MDA has two functions that are discriminative to the conventional sensor MAC, in that it achieves efficient aggregation and the avoidance of Network beacon collisions. The MDA is designed...
We propose a new MAC which promises deterministic packet transmission delay and highly reliable communication in a convergecast network. Our MAC provides a higher communication success ratio in both line of sight and non line of sight environment. We compared the performance of our MAC to contention based MAC using CSMA/CA.
TDMA has been proposed as a MAC protocol for wireless sensor networks (WSNs) due to its efficiency in high WSN load. However, TDMA is plagued with shortcomings; we present modifications to TDMA that will allow for the same efficiency of TDMA, while allowing the network to conserve energy during times of low load (when there is no activity being detected). Recognizing that aggregation plays an essential...
Duty cycling is a common mechanism for achieving energy efficiency in WSNs. Over the past several years a number of researchers have proposed low-power duty-cycle MAC protocols, but the tradeoff between energy efficiency and latency has been remained a challenging issue. We propose the Express-MAC protocol (EX-MAC) which can guarantee the requirement of the end-to-end transmission latency while conserving...
We designed RRMAC, a time division multiple access (TDMA) scheme guaranteeing hard real-time and reliable communication in a multi-hop convergecast network. We performed experiments to compare the performance of RRMAC and IEEE 802.15.4 and showed the advantages of RRMAC is WSN applications which require highly reliable real-time data transmission.
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