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As Cognitive Radio (CR) technology is recently emerged as a potential solution to overcome the problem of spectrum scarcity, Cognitive Wireless Mesh Networks (CogMesh) have great potential for enhancing the performance of wireless networks and meeting the demands of future generation wireless applications. By utilizing the available frequency bands that are unutilized by primary (licensed) users,...
In a feedback control system where a controller tries to control the behavior of a plant, when observing the histories of the control data and sensed data between them, we can estimate their importance thus priority; current (control or sensed) data with larger differences from previous data are more important so they should be given higher priorities, because the large differences mean that the controller...
This deep space sensor network based on DTN is an important research in modern deep space communications technologies. Bundle layer plays a key role in the network. How Bundle layer can provide services for network more rationally and efficiently is an important influencing factor to improve and enhance the network performance. This paper proposes special network architecture for this DTN-based network...
In wireless sensor networks(WSNs) code dissemination is an important technology to remotely add new functionality or fix bugs after the sensors are deployed. As WSNs is usually in hostile environments, secure code dissemination has been a major concern. Most code dissemination protocols are Deluge-based which have to take much energy and memory to deal with the problem caused by out-of-order-delivery...
Wireless Sensor Networks (WSN) contain sensor nodes powered by limited batteries. How to solve the tension between real-time reactivity to external events and energy saving for long lifetime is one major challenge. Duty cycle scheduling provides a method to balance the tension based on the application scenarios. However, time critical WSN applications often put strict requirements on both ends, quick...
This paper describes an autonomous monitoring system to supervise environmental parameters such as temperature, humidity, poisonous gases or smoke concentration, etc. This system is designed as a set of sensor nodes connected via a wireless network. The feature of this system is its ability to autonomously configure the network structure and synchronize data between nodes. This allows the network...
Wireless sensor networks (WSNs) usually consist of a large number of power-constrained sensors deployed to collect information in a specific sensed field. How to gather data in an energy-efficient manner is always a very important issue in WSNs. Recently, cluster-based data aggregation is widely used to reduce energy consumption and prolong network lifetime. However, most existing schemes proposed...
ZigBee is a standard based on the IEEE 802.15.4 standard for wireless personal networks. Its use in Wireless Sensor Networks (WSNs) has aroused a great interest in the research community in the last years. In this paper, a synthetic study to analyze the performances and improve the routing protocols in WSNs is given and we were interested in routing mechanisms defined by the ZigBee standard. Multiple...
For Wireless Multimedia Sensor Networks (WMSN), how to increase the throughput in constrained environments has become the main challenge. Multipath routing is a promising solution because it can improve the channel utilization rate, reduce transmission delay and balance the transmission load. To pursue high efficiency for a multipath routing scheme, we need to take the characteristics of wireless...
Data aggregation is generally considered an important method used to reduce traffic and increase lifetime of wireless sensor networks in both two- and three-dimensional space. It is challenging to develop efficient data aggregation solution for the wireless sensor networks since quality-of-service, such as end-to-end delay, is considered as a severe criterion required in many scenarios. In this paper...
Delay sensitive applications of Wireless Sensor Networks (WSNs) demand timely data delivery for fast identification of out-of-ordinary situations and fast and reliable delivery of notification and warning messages. Due to unreliable nature of WSNs, achieving real-time guarantees and providing reliable data are quite challenging. Reliable data dissemination is traditionally performed by applying error...
In wireless sensor networks (WSNs), sensors usually form a tree topology and the sensed data are transmitted to a sink using multihop communication fashion. The tree topology works effectively in handling the traffics towards the sink. However, this tree topology aggravates the waste of network resources. In particular, sensors close to the sink will overuse the energy for transmitting other sensed...
Wireless technology has gained much interest in industrial automation due to its flexibility, mobility, ease of installation, and lower cost. Wireless systems, in general, require additional and different engineering and maintenance tasks, for example cryptographic key management for security. The pace of application in process control has been impeded, however, by concern about the risks involved...
In this paper we consider the issue of localization in the context of underwater sensor networks which contain anchor nodes with perfect knowledge of their position, but asynchronous clocks. By taking advantage of a sequential broadcasting protocol the entire network can be localized simultaneously with minimal overhead. Additionally, it can be initiated by any node at any time. Through extensive...
This contribution focuses on securing end-to-end unicast communications in heterogeneous wireless sensor networks comprising satellite links, while maintaining effective network performance. The proposed protocol extends the LOCKSAT key management procedure, and is able to guarantee a frequent key renewal while overcoming limitations of each subnetwork (e.g., sensor and satellite). The effectiveness...
The quality-of-service (QoS) metrics in a wireless sensor network (WSN) of multiple sensor types depend on the performance of the network protocol layers, motivating a comprehensive cross-layer design approach to optimize QoS. Advances in energy-harvesting techniques enable increases in WSN lifetime by prolonging operation of the wireless nodes. While the primary objective of energy harvesting is...
A fundamental problem when locating sensors in a network is to estimate the distance between pairs of sensors. Since security of sensor networks is vulnerable in the wireless environment, this paper proposes a secure ranging scheme which can provide secure position information for wireless sensor applications. By generalizing the asynchronous distance estimation technology (Distance Estimation via...
Wireless sensor network (WSN) deploys tiny wireless sensor nodes to communicate with each other with limited processing speed, power and security measures. A recent WSN routing protocol defined as Secure Real-Time Load Distribution (SRTLD) has been developed to provide realtime transfer, high delivery ratio, and longer sensor node lifetime. However, SRTLD uses broadcast packets to perform neighbor...
Substation Automation is a modern approach capitalizing on the advancement in Information and Communication Technology to provide compact self healing and more reliable substations. In this quest, wireless communication technologies provide a brilliant option to reduce the connection effort. The vision is eventually to obtain equipment that may be described as “plug and play”. Nevertheless, the Substation...
IEEE 802.15.4 has poor performances in multi-hop network for the hidden terminal problem (HTP). This paper proposes a simple and effective mechanism to reduce the HTP in nonbeacon-enabled multi-hop network. Using the idea of RTS/CTS in IEEE 802.11 for reference, we propose adaptive adoption of RTS/CTS (a-RtsCts-CSMA/CA) depending on the collision result of transmissions and measure its performances...
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