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Due to their embedding into an unknown environment, wireless sensor networks are susceptible to adverse environmental conditions. A prime example is external interference, typically caused by 802.11, electric devices or co-located sensor networks, which can drastically influence communication. However, radios on sensor nodes provide multiple channels, which can help to alleviate interference problems...
Media access control (MAC) protocols of wireless sensor networks (WSNs) must minimize the radio energy costs in sensor nodes. Latency and throughput are also important design features for MAC protocols in the current WSNs applications. But most of them cannot guarantee quality for real-time traffic. This paper studies the state of the art of current real-time MAC protocols, and then introduces a medium...
In recent years, the use of wireless sensor networks for industrial applications has rapidly increased. However, energy consumption still remains one of the main limitations of this technology. As communication typically accounts for the major power consumption, the activity of the transceiver should be minimized, in order to prolong the network lifetime. To this end, this paper proposes an adaptive...
We describe an improved version of simple polling protocol employed in a wireless sensor network proposed. Although this simple wireless sensor network works efficiently, it is very limited in computing capability. Simple polling protocol works well in situation where every sensor node shares heavy traffic. However, when a few sensor nodes contribute to the traffic, most of the time slots allocated...
In this paper, we propose a variable packet length adaptive MAC Protocol (VPLA-MAC) for wireless sensor networks. VPLA-MAC is designed for clustering hierarchy networks based on the routing information collected from sensor nodes. A sensor node in cluster sends packet length and routing information to cluster head node, this cluster head node calculates the cycle length and selects nodes for data...
In most of the MAC protocols, we only optimize sensor nodes that are within each other's communication range. In some cases this kind of optimization is the local optimization and may affect the other nodes in large scale sensor networks. Moreover, these protocols can't solve the hidden terminal problem drastically; some of them are highly rely on RTS/CTS to avoid it, but it is inefficient. In this...
Energy consumption is one of the most important design criteria in wireless sensor networks. Sensor nodes are expected to be battery-equipped. Due to their working environments, recharging or replacing batteries for each node is difficult and uneconomical. So prolonging the service lifetime of sensor nodes is a critical issue. The MAC protocol for WSNs plays a very important role in the control of...
Directional antennas have the potential to enhance the performance of wireless networks. However, exploiting their capabilities requires channel access schemes specifically designed for this purpose. Among the numerous applications of sensor networks, roadside and highway monitoring can benefit from the use of directional antennas due to increased communication ranges between the sensor nodes, reduction...
Wireless sensor networking is an emerging technology that has a wide range of potential applications including environment monitoring. In this paper we present the important parameters which must be taken into account while designing MAC protocol for various wireless sensor nodes (Mica2, Mica2Dot & IMotes) based Sensor Networks.
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