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This paper proposes an adaptive 2 level active period length control method based on traffic load in each cluster for cluster-based wireless sensor networks (WSNs) employing IEEE 802.15.4 medium access control (MAC) protocol. The proposed method consists of two active period length controls: cluster level control and network level control. In the cluster level control, cluster heads autonomously control...
IEEE 802.15.4 is one of the most important protocols for wireless sensor networks. To improve the performance of this protocol in consideration of the trade-off between power consumption and end-to-end delay, duty cycle adaptation algorithms are effective solutions. In this paper, we propose an individual beacon order adaptation (IBOA) algorithm for IEEE 802.15.4 networks, which can individually adapt...
In wireless sensor networks (WSNs), timeliness is one of the most challenging problems for critical applications. Caccamo et al. designed a collision-free real-time MAC protocol for sensor networks by adopting the "cellular structure" in traditional telecommunication networks. They assumed that sensors are organized into many rigid hexagon cells and a router node is at the center of each...
Many anonymous communication solutions have been proposed to provide anonymous mobile ad hoc network (MANET) communications. However, they mainly focus on the routing layer and above to hide the end-to-end traffic patterns. The point-to-point communication relations are often considered as non-critical information in terms of anonymity, which actually exposes the traffic patterns on the PHY/MAC layer...
Ultra-wideband (UWB) is a physical (PHY) layer technology that promises high transmission rates, as well as high resistance to noise and multipath effects. However, the impulse-based nature of UWB, coupled with its low transmission power, makes it difficult to enable efficient detection of the signals. Consequently, conventional carrier-sensing based MAC protocols cannot be used with a UWB PHY. In...
Traffic and channel-data rate combined with the stream oriented methodology can provide a scheme for offering optimized and guaranteed QoS. In this work a stream oriented modeled scheme is proposed based on each nodepsilas self-scheduling energy management. This scheme is taking into account the overall packet loss in order to form the optimal effective -for the end-to-end connection- throughput response...
Different network applications need different Quality of Service (QoS) requirements such as packet delay, packet loss, bandwidth and availability. It is important to develop a network architecture which is able to guaranty quality of service requirements for high priority traffic. In Wireless Multimedia Sensor Networks (WMSNs), a sensor node may have different kinds of sensor which gather different...
Wireless sensor network has been widely used in many types of monitoring application in these recent years. For monitoring application such as forest or building monitoring, sensor nodes equipped with temperature sensor, smoke detector and camera will trigger immediately when a fire breaks out. Due to those sensor nodes are transmitting the sensor packets to a sink node at the same time and without...
ALLIANCES is a cooperative random access protocol proposed for taking advantage of diversity and resolving collisions in wireless networks. A multicluster extension of ALLIANCES was also proposed that enables its application to a large-scale wireless sensor network (WSN). In this paper, we propose a dominating set based approach coupled with destination-based routing to solve the problem in a large-scale...
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