WSNs-Wireless Sensor Networks comprises of small nodes with computation, sensing and wireless communications capabilities. Energy awareness is an essential design for WSNs and hence data broadcasting protocols, routing and power management isspecially designed to meet this requirement. However, the focus is mainly on the routing protocols which differ depending on the network design and applica...

Wireless sensor networks have been widely considered as one of the most important 21th century technologies and are used in so many applications such as environmental monitoring, security and surveillance. Wireless sensor networks are used when it is not possible or convenient to supply signaling or power supply wires to a wireless sensor node. The wireless sensor node must be battery powered.C...

Wireless Sensor Network Systems can be applied to monitor different environments ranging from military to civil applications. It has been observed that different protocols required for smooth functioning of the network system are highly application specific. Another important fact is that the communication protocols have significant role in achieving right performance of the network system. In ...

Providing field coverage is a key task in many sensor network applications. In certain scenarios, the sensor field may have coverage holes due to random initial deployment of sensors; thus, the desired level of coverage cannot be achieved. A hybrid wireless sensor network is a cost-effective solution to this problem, which is achieved by repositioning a portion of the mobile sensors in the netw...

Body area networks is one of the types of wireless area networks which has been created to optimize utilizing hospital resources and for earlier diagnosis of medical symptoms, and ultimately to reduce the cost of medical care. This network like most of the wireless networks is without infrastructure and the embedded sensor nodes in the body have limited energy. Hence, the early power completion...

Due to resource constraint nature of sensor nodes, the network suffers by computation and security problems. These nodes create a wireless sensor network that used sink stable or mobile as per required applications. Therefore, various traditional security techniques of the traditional networks are not possible to be applied on this network. To overcome the security problem in this ad-hoc or wir...

In Wireless Rechargeable Sensor Networks, one or more special mobile entities (called the Mobile Chargers) traverse the network and wirelessly replenish the energy of sensor nodes, using wireless power transfer technology. In this paper, we present some state of the art algorithms that apply to characteristic problems in such networks, namely efficient use of wireless power transfer using i) on...

Recent advances in wireless communication technologies have enabled the development of Wireless Sensor Networks (WSNs) that consist of low cost, power and small-size sensor nodes. ZigBee, an IEEE 802. 15. 4 based wireless sensor networks have been the promise of facilitating large-scale and real-time data processing in complex environments. Mobility management is a challenging task in the IEEE ...

Wireless sensor networks are the grouping of tiny sensor nodes, which collects the information by sensing activeness from the surroundings similar lands, forests, hills, sea. In wireless sensor networks, using mobile sinks mobility rather than static sink for data collection is the new trend in present years. Current researches are focusing on moving patterns of the mobile sink to achieve optim...