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Energy efficiency is a very important requirement in designing a MAC protocol for wireless sensor networks (WSNs) using battery-operated sensor nodes. We proposed a new energy-efficient MAC protocol, RIX-MAC, based on asynchronous duty cycling and receiver-initiated scheme. In this paper, we analyze the performance such as throughput, delay, and energy consumption of RIX-MAC with modeling and simulation...
The wireless sensor networks — RSSFs are composed of a large number of distributed nodes, reduced dimensions that work together to perform a task. This type of network has been the subject of intensive research, and has applicability in several areas, such as environment monitoring, robotics and in the medical field. This paper deals with the application of wireless sensor networks in the medical...
A wireless sensor network is an ad hoc network with a great number of nodes which are microsensors able to collect and to transmit data in an autonomous way. The wireless sensor networks (WSNs) have known recently a much diversified use in various fields: environmental monitoring, health, protection of the borders, industry, military applications, natural safety, transport, disasters… etc. In the...
The wireless sensor network (WSN) is one new hot spot for both research and industry. However, the energy problem has been becoming a challenge in practical applications for WSN because the sensor nodes are supplied with energy by batteries which are difficult to be recharged and replaced. So many researches are taken on reducing the energy consumption of WSN nodes. Medium Access Control (MAC) layer...
Duty cycle MAC protocols achieve high energy efficiency and they are widely used in wireless sensor networks. However, they often suffer long end-to-end latency due to multi-hop sleep delay and are not suitable for industrial applications. RMAC, which employs multi-hop reservation mechanism, shows great advantage in reducing end-to-end latency than other duty cycle MAC protocols. However, due to interference...
Wireless Sensor Networks are by nature deployed over an undetermined geographical area with uncountable number of nodes, which makes them best studied through simulation. Due to special characteristics of these networks a number of simulation tools have been introduced by institutes and individuals each with different mechanisms and approaches. Hence, selecting a proper simulator based on the network...
In this paper, a MAC architecture designed by our institute based on high performance FPGA has been introduced. We also propose a firmware design scheme of the mobile support mechanism. Compared with other designs, the proposed structure improves the system integrated level and is easy for future enhancements. The implementation scheme of the mobile support mechanism in this paper can also be adopted...
In order to reduce power consumption, many previously proposed MAC protocols for wireless sensor networks (WSNs) use a periodical active/sleep scheme. However, this scheme may not adapt to varying traffic conditions. A new throughput-adaptive MAC protocol (TA-MAC) is proposed in this paper, where overhearing nodes try to notify nodes a few hops away about the current transmission, therefore the latter...
Low latency for packet delivery, high throughput, good reactivity, and energy-efficient operation are key challenges that MAC protocols for Wireless Sensor Networks (WSNs) have to meet. Since traffic patterns as well as network load may change during network lifetime, adaptability of the protocol stack, e.g. in terms of duty cycling, and the integration of reliable transport mechanisms are mandatory...
Data transmitted in large scale wireless sensor surveillance networks is highly spatial correlated resulting in transmission of redundant data, which increase the energy consumption. So it has been proposed to select a subset of sensors nodes to transmit their data so as to prevent transmission of redundant data. In this paper, we investigate the ways of selecting sensor nodes and develop a novel...
In order to balance the tradeoff between the energy efficiency and latency which exists in the protocol of the single channel medium access control for wireless sensor networks (WSNs), a novel dual channel-based medium access control (MAC) protocol abbreviated as DCMAC is proposed in this paper. The wakeup channel of the nodes in DCMAC implement the listening based on probability during every listening/sleeping...
Most of the MAC protocols proposed for the wireless sensor networks (WSN) assume sensor nodes to be static and therefore they usually fail or provide very bad network performance in mobile sensor networks. Since WSN mobile applications have become popular nowadays, there is a need for MAC protocols that consider mobility. In this paper, we propose a mobility-aware MAC protocol for WSN that can work...
In wireless sensor network research, simulation is one of the most important approaches to evaluate system or protocol performance. The accuracy of estimated results depends on selected simulation parameters. In existing analysis on wireless sensor network, simple interference models are used in simulations, which only take interference signals from nodes in a particular range into account. Based...
We propose using dynamic backoff on CSMA-type MAC layer protocols to improve message delivery reliability in wireless sensor networks. It is assumed that the MAC layer is able to determine message reliability requirements by reading a reliability data bit embedded within the message. The basic concept is to apply shorter random backoff times to important messages. This gives them the opportunity to...
To improve the efficiency and flexibility of reliable broadcast/multicast MAC protocol in wireless multi-hop network, a novel adaptive reliable broadcast/multicast MAC protocol (ARBMAC) is brought forward. The core idea of it is based on the broadcast/multicast cost function, which is proposed by analyzing different realizations of reliable broadcast/multicast. According to the function, the most...
Energy efficiency is of the utmost importance in wireless sensor networks. The family of low-power-listening MAC protocols was proposed to reduce one form of energy dissipation-idle listening, a radio state for which the energy consumption cannot be neglected. Low-power-listening (also called channel probing) MAC protocols are characterized by a duty cycle: a node probes the channel every ti s of...
Providing efficient mechanisms to reduce consuming power and optimize computing resources is one of the most important goals to be pursued when an efficient utilization of sensor networks has to be addressed. To reduce power consumption at the MAC level, sensor networks usually make use of a scheduled contention protocol that adopts listen/sleep cycles. Cycles synchronization can improve performance,...
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