A crucial issue for data collection in wireless sensor networks is that the energy consumption of the sensor nodes placed near the sink is very high. This is because the sensors placed near the sink have to forward the data to the sink on behalf of others resulting in the depletion of energy quickly, which will lead to network partitioning and limitation in the network lifetime. In order to sol...

In this talk, we present recent research on simple, local energy aware mechanisms for prolonging the lifetime of sensor networks. We consider the fundamental problem of data propagation, when sensors collect data from the environment and report it to a particular sink node. Sensors collaborate locally to relay data in a multi-hop fashion towards the sink. However, the geometry of the data-paths...

The data collection problem is one of the most important issues in Wireless Sensor Networks (WSNs). Constructing a tree from all sensor nodes to the sink node is the simplest way, but this raises the problem of energy unbalance since the sensors closer to the sink node would have much higher workloads from relaying data. To cope with the energy unbalance problem, a number of mobile-sink mechani...

In this paper we present an overview of energy efficient strategies in wireless sensor networks (WSNs) with mobile sink. Firstly, we investigate the existing issues in WSNs. Then we focus on the problem of energy efficient data gathering strategy with mobile sink and present some existing solutions. Finally, we conclude this paper with some potential extensions which need to be further explored...

Eight major tidal constituents in the Sea of Okhotsk have been investigated using a numerical solution of tidal equations on a 59 space grid. The tides are dominated by the diurnal constituents. Diurnal tidal currents are enhanced in Shelikhov Bay and Penzhinskaya Guba, at Kashevarov Bank, in proximity to the Kuril Islands and at a few smaller locations. The major energy sink for diurnal tides ...

Wireless sensor networks with mobile sink are expected to increase the flexibility for gathering information in the large-scale sensing and detecting environments. The sink can randomly move within the sensing area to collect the sensing data. Energy saving becomes one of the most important features for the sensor nodes to extend their lifetime in such networks. To provide reasonable energy con...

In this paper, we propose the mobility of a sink in improved energy efficient PEGASIS-based protocol (IEEPB) to advance the network lifetime of Wireless Sensor Networks (WSNs). The multi-head chain, multi-chain concept and the sink mobility affects largely in enhancing the network lifetime of wireless sensors. Thus, we recommend Mobile sink improved energy-efficient PEGASIS-based routing protoc...

This paper exploits sink mobility to prolong the lifetime of sensor networks while maintaining the data transmission delay relatively low. A location predictive and time adaptive data gathering scheme is proposed. In this paper, we introduce a sink location prediction principle based on loose time synchronization and deduce the time-location formulas of the mobile sink. According to local clock...

More and more researchers concentrate their attention on energy efficient usage and lifetime of Wireless Sensor Networks (WSNs). One of the complications impacting network lifetime is hotspot issue which can be solved by emerging Mobile Sink Wireless Sensor Networks (MSWSNs). In this paper, we propose circle-based data dissemination (CBDD) algorithm which supposes that sensor nodes are symmetri...

Maximizing the lifetime of energy constrained wireless sensor networks is a very challenging issue. It has been demonstrated that the use of a mobile sink can significantly increase the network lifetime by balancing the load among nodes. However, in existing solutions, nodes either send their data through multihop towards the sink or store the data until the sink comes at the node’s vicinity, w...