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The Internet of Things (IoT) expects to link billions of devices to the Internet, which will produce massive amounts of data. Current approaches move the IoT data out of the network for processing. It results in long delays and increases the network traffic. The Named Function Networking (NFN) proposes a generic computation architecture for in-network data processing. But it does not consider a scheduling...
Medium access control (MAC) protocol plays a crucial role in energy-efficiency, latency reduction and throughput for sensor networks. However, it is nontrivial to achieve good performance in different facets of metrics at the same time. In this paper, we present the performance of an Adaptive Scheduling MAC (AS-MAC) protocol with different Adaptive Scheduling period (AS-period) in multi-hop networks...
In Wireless Sensor Networks, the traffic is light under idle or light load. When an event is detected the network becomes active and the data flow traffic becomes heavy, which leads to congestion. Congestion plays an vital role in reducing the performance of the network. Hence it necessitates to develop an effective congestion control technique. This paper focus on congestion detection and control...
This paper presents a history based statistical channel access mechanism for enabling traffic prioritization in wireless sensor networks. Prioritized access is realized such that low priority non-real-time sensors can access channel bandwidth that is unused by high priority real-time traffic. The key idea is for the low priority sensor nodes to first observe and statistically model the channel usage...
In recent years, Wireless Sensor Network (WSN) which consists of a large number of sensor nodes having wireless communication and self-organizing capability receives much attention. The design of protocols for such networks has to be energy aware in order to prolong the lifetime of the network. Multi-hop and clustering communication are most efficient routing methods in WSN. Multi-hop communication...
Recently, many studies exploit mobile sinks to construct large-scale databases for environmental observations or weather forecasting. Mobile sinks travel in the sensing area that sensors are deployed, collect data from each sensor, and uploads them to sensor databases. By using mobile sinks, we can reduce communication traffic and maintenance cost compared with those for wireless sensor networks (WSNs)...
It is necessary that in the small-or-medium-size wireless sensor networks, the networking information of network and monitoring data of sensors should be sent to the remote computers through the gateway to achieve remote monitoring for the target area. Wireless sensor network data characterize strong bursts, instability of traffic and small amount of data in a single packet. Considering these features...
Debugging of embedded wireless systems is a challenge as the amount of information available from the nodes is limited. To enable system-level debugging of wireless networks, we have devised a distributed assertion support based on SystemVerilog Assertions (SVA). In this work, we have modeled wireless sensors at the transaction level in SystemVerilog. The proposed approach indicates that the assertions...
Recently there has been a great deal of research on using mobility in wireless sensor networks to facilitate surveillance and reconnaissance in a wide deployment area. Besides providing an extended sensing coverage, the node mobility along with the spatial correlation of the monitored phenomenon introduces new dynamics to the network traffic. These dynamics could lead to long range dependent (LRD)...
In Wireless Sensor Networks, most of the existing key management schemes, establish shared keys for all pairs of neighbor sensors without considering the communication between these nodes. This results in causing huge overhead. For large scale WSNs, these schemes still need each sensor to be loaded with a bulky amount of keys. In many-to-one traffic pattern of sensor networks, large numbers of sensor...
Broadcast communication is a dominant communication pattern in WSN. As a major security concern, the broadcast source authentication is needed to mitigate impersonation of a broadcast source, modifications of its broadcasted data, or depletion of the limited energy of sensors caused by an attacker injecting useless broadcast traffic. Several Broadcast Source Authentication Protocols (BSAPs) were proposed...
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...
Wireless sensor networks (WSNs) are becoming a viable tool for many monitoring applications. In many cases these applications may be of critical nature where the transmitting of vital information from sensors to base station or sink is crucial, and data loss cannot be tolerated. As a result, the information transmission of wireless sensor networks has various different requirements in performance,...
Adaptability is a key strategy in the design of effective wireless sensor networks. Communication schemes need to adapt to dynamic topologies and fluctuating traffic rates. Applications have to alter their behavior to respond to mutated necessities or to cope with environmental changes. The network, as a whole, has to tolerate the disappearance of faulting nodes or the appearance of additional ones...
In wireless sensor networks (WSNs), a challenging problem is how to advance network QoS. Energy-efficiency, network communication traffic and failure-tolerance, these important factors of QoS are closely related with the applied performance of WSNs. Hence a QoS-aware routing protocol called directed alternative spanning tree (DAST) is proposed to balance the above three factors of QoS. A directed...
Wireless sensor networks consist of a large number of sensor nodes with limited power and resource. To prolong network lifetime, the energy consumption must be somehow reduced. In this paper, we propose a localized density control algorithm for energy savings. The goals are to maintain a minimal number of active sensor nodes and to reduce radio-traffic intensity while conserving the sensing coverage...
A new and simple MAC protocol is proposed. Each node transmits a burst with length sampled from a geometric distribution with parameter q followed by a carrier sense slot. A node repeats the previous operations until it senses a busy slot. A node will access the channel and transmit its payload when it has sensed h idle slots. The parameter q can be adjusted for each node to achieve desired levels...
In event-driven wireless sensor networks nodes transmit information only if the monitored physical magnitude levels have triggered an alarm. In these networks, traffic exhibits a high spatial correlation, since it is likely that neighbor nodes detect and try to notify the same events. Thus, the probability of packet collision raises up, as well as notification delay, just as opposite as required....
The overlay-based network architecture has been recognized as an effective way to deal with the funneling effect in sensor networks, where sensors closer to the sink are usually responsible for relaying more network traffic. Such funneling effect is particularly harmful when the number of sensors in the network is vast. In an overlay-based sensor network, a special type of resource-rich multi-radio...
Network monitoring and measurement is an invaluable tool for comprehending, analyzing, managing, and optimizing performance and security of networked systems. Network monitoring architectures can take the form of local or distributed deployments of sensors. Local deployments can be very precise and efficient because they benefit from fast links to the central monitoring station, but their scope can...
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